Astronomical Calendar - A.D. 2020

Dominical Letters: "E" & "D" - Used in a Perpetual Calendar. For Leap Year of 2020.


Authored By Glenn A. Walsh *** Sponsored By Friends of the Zeiss
Electronic Mail: < astrocalendar@planetarium.cc > *** Internet Web Cover Page: < http://www.planetarium.cc >
This Internet Web Page: < http://buhlplanetarium4.tripod.com/astrocalendar/2020.html >
SpaceWatchtower Blog
2020 January

Internet Web Site Master Index for the History of
The Buhl Planetarium and Institute of Popular Science, Pittsburgh

SpaceWatchtower Blog


ASTRONOMICAL / CALENDAR EVENTS --

A.D. 2020

January ** February ** March

April ** May ** June

July ** August ** September

October ** November ** December


2020

Equinoxes (EQX), Solstices (SOLC), and Cross-Quarter (XQ) Days

Chronological Cycles and Eras

Astro Calendar
Current Month

Astro Calendar
Archives


Constellations
For Year

Star Charts
For Year

Moon Phases:
Archive * 2020 * Today

Next 27.32166 Days (Orbital Period)
(Scroll to bottom of page)

Planets, Stars, Sky Events:
Today *** This Week

Solar System *** Archive

Occultations:

Archive * 2020

10,000-Year
Calendar

Astronomy Links

Science Links

Astronomical Glossary
Click here for links to the Moon, planets, star clusters, stars, and other astronomical terms referred to in this Astronomical Calendar.

2020 Equinoxes (EQX), Solstices (SOLC), and Cross-Quarter (XQ) Days - Archive

* Sun., Feb. 2 - Traditional Astronomical Cross-Quarter Day Imbolc, and also Candlemas, better known as Groundhog Day. (First traditional Astronomical Cross-Quarter Day of year; approximate mid-way point in Winter season: Feb. 1 Eve - Feb. 2).
(Groundhog Day at Gobler's Knob, Punxsutawney PA 15767, home of Punxsutawney Phil: - Sunrise: 7:26 a.m. EST / 12:26 UTC) .

* Mon., Feb. 3, 3:55 a.m. EST / Feb. 4, 8:55 UTC - Actual Astronomical Cross-Quarter Day (First actual Astronomical Cross-Quarter Day of year; mid-way point in Winter season: ~Feb. 4).
Traditional Cross-Quarter Day.

* Thur., March 19, 11:50 p.m. EDT / March 20, 3:50 UTC - Vernal Equinox - Season of Spring begins in Earth's Northern Hemisphere: beginning of New Year (solar calendar) in Afghanistan and Iran. (~March 20)

* Fri., May 1 - Traditional Astronomical Cross-Quarter Day Beltaine, better known as May Day - Second traditional Astronomical Cross-Quarter Day of year; approximate mid-way point in Spring season (May 1).

* Mon., May 4, 8:49 p.m. EDT / May 5, 0:49 UTC - Actual Astronomical Cross-Quarter Day Beltaine, better known as May Day - Second traditional Astronomical Cross-Quarter Day of year; mid-way point in Spring season (~May 5-6).
Traditional Cross-Quarter Day.

* Sat., June 20, 5:44 a.m. EDT / 21:44 UTC - Summer Solstice - Season of Summer begins in Earth's Northern Hemisphere (~June 21).
Also see 1985-1991: Summer "Solstice Day," Annual Free Day at Buhl Planetarium.

* Sat., Aug. 1 - Astronomical Mid-Point of Summer - Traditional Astronomical Cross-Quarter Day, also known as “Lammas” (in the United Kingdom) and “Lughnassad” (in Ireland). Considered approximate date of First Harvest (third traditional cross-quarter day of the year), approximately between the Midsummer Solstice and the Autumnal Equinox (July 31 Eve - Aug. 1).

* Thur., Aug. 6, 9:04 p.m. EDT / Aug. 7, 1:04 UTC - Astronomical Mid-Point of Summer - Actual Astronomical Cross-Quarter Day (halfway between the June Solstice and September Equinox: ~Aug. 6 to 7).
Traditional Cross-Quarter Day.

* Tue., Sept. 22 - Falls Prevention Awareness Day (First day of Fall: ~Sept. 22-23).

* Tue., Sept. 22, 9:31 a.m. EDT / 13:31 UTC - Autumnal Equinox - Season of Autumn begins in Earth's Northern Hemisphere. (~Sept. 22)
Also see: Harvest Moon.

* Oct. 31 / Nov. 1 / Nov. 2 - Traditional Astronomical Cross-Quarter Day Samhain or "All-Hallowsmas", better known as Halloween (Oct. 31 - "All Hallows Eve"), All-Saints Day (Nov. 1), All-Souls Day (Nov. 2) (fourth and last traditional cross-quarter day of year).

What is a "Cross-Quarter Day" ?
What is the Astronomical significance of
Halloween, All-Saints Day, and All-Souls Day?
Link 1 *** Link 2 *** Link 3 *** Link 4

* Sat., Nov. 7, 5:56 p.m. EST / 22:56 UTC - Actual Astronomical Cross-Quarter Day (fourth and last actual cross-quarter day of the year: ~Nov. 6-7).
Traditional Cross-Quarter Day.

* Mon., Dec. 21 - Homeless Persons' Memorial Day. (First day of Winter; longest night of the year: ~Dec. 21)

* Mon., Dec. 21, 5:02 a.m. EST / Dec. 22, 10:02 UTC - Winter Solstice - Season of Winter begins in Earth's Northern Hemisphere. (~Dec. 21-22)
Also see: "The Stars of Winter" and "The Star of Bethlehem" Planetarium Sky Dramas (web sites include entire planetarium show scripts), performed each Winter in the Theater of the Stars of Pittsburgh's original Buhl Planetarium and Institute of Popular Science.

Chronological Cycles and Eras Corresponding to Anno Domini (A.D.) 2020 or 2020 Common Era (C.E.) - Archive

Unless otherwise indicated, all dates are given in terms of the Gregorian Calendar.
For recent years, January 14 of the Gregorian Calendar corresponds to January 1 of the Julian Calendar.

Dominical Letters: "E" & "D" - Used in a Perpetual Calendar. For Leap Year of 2020.
Epact: 5.
Golden Number (Lunar Cycle): 7.
Roman Indiction: 13.
Solar Cycle (28-year cycle of the Julian calendar): 13.
Julian Period (Year of): 6733.

Byzantine Year 7529 Begins Sept. 14.
Jewish Year (A.M.) 5781 Begins at local Sunset, Sept. 17.
Chinese / Asian Lunar New Year (Lunar Calendar) - Year of the Rat 4718 Begins Jan. 25.
Roman A.U.C. (Dates from the founding of the City of Rome) Year 2773 Begins Jan. 14.
Nabonassar Year 2769 Begins April 18.
Japanese (Heisei) Year 2680 - Begins January 1.
Grecian Year (Selucidae) 2332 Begins Sept. 14 (or Oct. 14).
Indian Year (Saka) 1942 Begins March 21.
Diocletian Era (Era of the Martyrs) Year 1737 Begins Sept. 11.
Islamic (Hegira) (FCNA date) Year 1442 Begins at first viewing of lunar crescent (New Moon) on evening (after local Sunset) of Aug. 18.
Baha'i Year 177 Begins at local Sunset on March 18.

NEWS: Astronomy, Space, Science

History of Buhl Planetarium and Institute of Popular Science, Pittsburgh


A.D. 2020

Astronomical Calendar: 2020 January
Monthly Observances This Month

Quadrantid Meteor Shower: Jan. 3 to 4

Moon Phases:
Today *** Calendar Month
Next 27.32166 Days
(Orbital Period)

Planets, Stars, Sky Events:
Today *** This Week
Solar System *** Occultations
Constellations *** Star Chart

View International Space Station (ISS)
Rocket Launches This Month: Link 1 *** Link 2 *** Link 3 *** Link 4

Equinoxes (EQX), Solstices (SOLC), and Cross-Quarter (XQ) Days For This Year.
Chronological Cycles and Eras For This Year.
Dominical Letters: "E" & "D" - Used in a Perpetual Calendar. For This Leap Year.

Astronomical Glossary
of Terms Used

Astronomical Calendar
Archives

Other
Astronomical Calendars: Link 1 * Link 2

10,000-Year Calendar

Rise & Set Times

Current Sky Events & Astro Phenomena

News: Astronomy, Space, Science --

Weekly: SpaceWatchtower Blog

Daily: SpaceWatchtower Twitter Feed

History of Pittsburgh's Original
Buhl Planetarium and Institute of Popular Science

Astronomy Links

Science Links


a.m. = Ante-Meridiem (Morning: Midnight to a moment before Noon)

p.m. = Post-Meridiem (Afternoon & Evening: a moment after Noon to a moment before Midnight of the next day)

EST = Eastern Standard Time *** EDT = Eastern Daylight Saving Time *** UTC = Coordinated Universal Time

SPECIAL NOTES:
(1) All astronomical or sky observations are always weather-permitting.
(2) For calendar entries which describe a relationship between two or more celestial objects, unless otherwise noted all relationships between celestial objects are visual relationships as seen from Earth only.


* Nov. 1 to April 30 - Use of life jackets by every person on a small boat (less than 16 feet in length), during cold-weather months, is mandatory. (Nov. 1 to April 30)

* Tue., 2019 Dec. 31 - Make Up Your Mind Day. (Dec. 31)

* Tue., 2019 Dec. 31 - Eve of New Year's Day (Traditional). (Dec. 31)

* Tue., 2019 Dec. 31, 7:00:00 p.m. EST / 2020 Jan. 1, 0:00:00 UTC - Marks the beginning of the New Year by the Coordinated Universal Time scale, the time scale used by many scientists. (Dec. 31)

* Wed., Jan. 1 - Feast of the Circumcision of Christ - Eighth day of the 12 days of Christmas: Dec. 25 to Jan. 5. During the Gregorian Calendar reform, Pope Gregory XIII, chose the Feast of the Circumcision of Christ as the beginning of the New Year in the Roman Catholic Church's Liturgical Year; previously, the Feast of the Annunciation on March 25 (also the Vernal Equinox in the "original" Julian Calendar adopted by the second King of Rome, Numa Pompilius, in the 7th century B.C.) had been considered the beginning of the New Year. (Jan. 1)

* Wed., Jan. 1 - Last day of Kwanzaa - Week-long holiday observance honoring African-American heritage. (Dec. 26 to Jan. 1)

* Wed., Jan. 1 (1863) - Anniversary: Emancipation Proclamation issued by U.S. President Abraham Lincoln during the American Civil War, which decreed that slaves in the rebellious states are free forever. (Jan. 1)

* Wed., Jan. 1 - First Day Hikes in America’s State Parks. (Jan. 1)

* Wed., Jan. 1, 12:00:00 Midnight (0:00:00) Prevailing Local Time - For Eastern Standard Time (EST) Zone in North America: 12:00:00 Midnight EST / 5:00:00 Coordinated Universal Time (UTC) which correlates with 12:00:00 Midnight EST - New Year's Day: New Calendar Year begins. (Jan. 1)

* Wed., Jan. 1, 8:30 p.m. EST / Jan. 2, 41:30 UTC - Moon at apogee: 251,394 statute miles / 404,580 kilometers.

* Thur., Jan. 2, 11:45 a.m. EST / Jan. 3, 4:45 UTC - Primary Moon Phase: First Quarter.

* Jan. 3 Evening to Jan. 4 Morning - (Best viewing: Midnight to Dawn) - Peak of Quadrantid Meteor Shower. (Jan. 3 to 4)

* Sat., Jan. 4 - Latest time of sunrise, for the year, for locales (such as Pittsburgh) at or near +40 North Latitude. (Jan. 4)

* Sun., Jan. 5 - National Bird Day. (Jan. 5)

* Sun., Jan. 5, 2:47 a.m. EST / 7:47 UTC - Earth at perihelion (closest Earth approach to the Sun in New Year): 91,398,199 statute miles / 147,091,144 kilometers. (Jan. 2 to 5)

* Sun., Jan. 5, Evening - "12th Night" of Christmas; end of the 12 days of Christmas, which began on Christmas Day. (Jan. 5)

* Mon., Jan. 6 - Feast of the Epiphany; the day after the "12th Night" of Christmas. Tradition celebrates Epiphany as day the Magi arrived in Bethlehem to present gifts to the Christ child. (Jan. 6)

* Mon., Jan. 6 - National Returns Day - When the most UPS returns packages are sent back to retailers. (Jan. 5 to 6)

* Tue., Jan. 7 - Orthodox Christmas - As determined by Julian Calendar. (Jan. 7)

* Tue., Jan. 7, 4:09 p.m. EST / 21:09 UTC - Star Aldebaran 3.0 degrees south of the Moon.

* Wed., Jan. 8 (1918) - Mount Wilson Observatory Astronomer Harlow Shapley discovered true magnitude of Milky Way Galaxy and true location of Earth and our Solar System in the Milky Way Galaxy.
On 1941 November 19, Harvard College Observatory Director Harlow Shapley delivered the keynote address at the dedication for a rather unique 10-inch Siderostat-Type Refractor Telescope at Pittsburgh's original Buhl Planetarium and Institute of Popular Science. (Jan. 8)

* Wed., Jan. 8 (1851), 2:00 a.m. Paris Time - Earth's Rotation Day - Anniversary: French physicist Jean Leon Foucault develops a simple device to finally demonstrate and prove that the Earth rotates on its axis: Foucault Pendulum. He demonstrated the Foucault Pendulum, before scientists at the Paris Observatory, on 1851 February 3.
Near the end of his life, Jean Leon Foucault also developed the Siderostat-type Refractor Telescope. (Jan. 8)

* Thur., Jan. 9 (1793) - First balloon flight in America. (Jan. 9)

* Fri., Jan. 10 (1920) - Founding of the League of Nations. (Jan. 10)

* Fri., Jan. 10, 10:00 a.m. EST / 15:00 UTC - Mercury at superior conjunction (Mercury not visible, even with a telescope).

* Fri., Jan. 10, 2:09:59.2 p.m. EST / 19:09:59.2 UTC - Time of Greatest Eclipse for dim Penumbral Eclipse of the Moon / Penumbral Lunar Eclipse, visible in Europe, Asia, Africa, and Australia. Even at peak eclipse, Full Moon brightness dims only slightly. This is the first of four Penumbral Lunar Eclipses in 2020. More information: Link 1 *** Link 2 *** Link 3
NOTE: IT IS SAFE TO LOOK DIRECTLY AT THIS ECLIPSE OF THE MOON / LUNAR ECLIPSE WITH THE NAKED EYES (ONE-POWER), BINOCULARS, OR A TELESCOPE.

* Fri., Jan. 10, 2:21 p.m. EST / 19:21 UTC - Primary Moon Phase: Full Moon - Wolf Moon.

* Fri., Jan. 10, 9:26 p.m. EST / Jan. 11, 2:26 UTC - Star Pollux 5.3 degrees north of the Moon.

* Sat., Jan. 11 - Learn Your Name in Morse Code Day. (Jan. 11)

* Sat., Jan. 11 - National Milk Day. (Jan. 11)

* Sat., Jan. 11 - National Human Trafficking Awareness Day. (Jan. 11)

* Sat., Jan. 11 - Rocket Launch (Estimated Launch Date): SpaceX Falcon 9 critical Crew Dragon In-Flight Abort test flight from Cape Canaveral Air Force Station, Florida.

* Sat., Jan. 11, 6:54 p.m. EST / Jan. 11, 23:54 UTC - Beehive Open Star Cluster 1.0 degree south of the Moon.

* Mon., Jan. 13 - National Clean Off Your Desk Day. (2nd Monday of January)

* Mon., Jan. 13 - New Year's Eve, according to the Julian Calendar. (Jan. 13)

* Mon., Jan. 13, 6:37 a.m. EST / 11:37 UTC - Star Regulus 3.8 degrees south of the Moon.

* Mon., Jan. 13, 9:00 a.m. EST / 14:00 UTC - Saturn in conjunction with the Sun (Saturn not visible, even with a telescope).

* Mon., Jan. 13, 3:20 p.m. EST / 20:20 UTC - Moon at perigee: 227,396 statute miles / 365,958 kilometers.

* Tue., Jan. 14 - Beginning of the New Year, according to the Julian Calendar. (Jan. 14)

* Wed., Jan. 15 (1929) - Anniversary of the Birthday of Martin Luther King, Jr. (Observed - USA: Third Monday in January): Birth of Rev. Dr. Martin Luther King, Jr.. (Jan. 15)

* Wed., Jan. 15 (2001) - Anniversary of launch of Wikipedia, free-of-charge, on-line encyclopedia. (Jan. 15)

* Jan. 16 to 25, 8:00 to 10:00 p.m. Prevailing Local Time - CITIZEN SCIENCE: Monthly Globe at Night campaign, to raise public awareness of the impact of light pollution by encouraging everyone everywhere to measure local levels of night sky brightness and contribute observations on-line to a world map.

* Fri., Jan. 17 - Kid Inventors’ Day (K.I.D.), on January 17 in honor of the birth of famous inventor Benjamin Franklin, who invented the first swim flippers at the age of 12. (Jan. 17)

* Fri., Jan. 17, 7:58 a.m. EST / 12:58 UTC - Primary Moon Phase: Last Quarter.

* Fri., Jan. 17, 6:03 p.m. EST / 23:03 UTC - Mars 4.7 degrees north of Star Antares.

* Mon., Jan. 20 (1937 to present, on years divisible by four) - U.S. Presidential Inauguration Day. (Jan. 20)

* Mon., Jan. 20 - Martin Luther King, Jr. Day (Observed - USA: Third Monday in January): Birth of Rev. Dr. Martin Luther King, Jr.: 1929 Jan. 15. (Third Monday in January)

* Mon., Jan. 20, 2:13 p.m. EST / 19:13 UTC - Conjunction: Earth's Moon and Mars. The Moon passes 2.3 degrees north of Mars, above the southeastern horizon. Best view before Local Dawn.

* Tue., Jan. 21 - Squirrel Appreciation Day. (Jan. 21)

* Wed., Jan. 22, 9:42 p.m. EST / Jan. 23, 2:42 UTC - - Conjunction: Earth's Moon and Jupiter. The crescent Moon passes very close to Jupiter (Moon passes 0.4 degree south of Jupiter). This conjunction will be difficult to see as both objects rise shortly before Local Sunrise. Occultation to occur.

* Thur., Jan. 23 - Sun rises for first time in year (after Sun setting for last time of previous year on November 18: total of 67 days of darkness) in the northern-most town in United States of America: Barrow, Alaska (330 miles north of the Arctic Circle). (Jan. 23)

* Fri., Jan. 24 - National Compliment Day. (Jan. 24)

* Fri., Jan. 24, 4:42 p.m. EST / 21:42 UTC - Primary Moon Phase: New Moon.

* Sat., Jan. 25 (1915) - First transcontinental telephone call. (Jan. 25)

* Jan. 26 to Feb. 1 - Celebrate Catholic Schools Week. (End of January / Beginning of February)

* Sun., Jan. 26 - Australia Day, commemorating the first landing in Australia by Captain Arthur Phillip. (Jan. 26)

* Jan. 27 to 31 - Tax Identity Theft Awareness Week. (Last business week of January / first business week of February).

* Mon., Jan. 27 - Holocaust Remembrance Day (UN). (Jan. 27)

* Mon., Jan. 27 (1967) - Anniversary of Apollo 1 fire; three astronauts perished: Gus Grissom, Ed White, Roger Chaffee. (Jan. 27)

* Mon., Jan. 27 (1926) - First public demonstration, in London, of a black-and-white, mechanical television system. (Jan. 27)

* Mon., Jan. 27 - National Bubble-Wrap Appreciation Day, first used by IBM to safely ship computers in 1961. (Last Monday of January)

* Mon., Jan. 27, after Local Sunset - Venus and Neptune very close (~0.1 degree separation) in southwestern sky after sunset. Although Venus is very easy to find with the naked eyes (one-power), a telescope will be necessary to find much dimmer Neptune in the brightness of Venus.

* Tue., Jan. 28 (1986) - Anniversary of STS Space Shuttle Challenger explosion; seven astronauts perished: Francis Scobee, Michael Smith, Elison Onizuka, Judith Resnik, Ronald McNair, Gregory Jarvis, Christa McAuliffe (Teacher-in-Space). (Jan. 28)
Viewed at Pittsburgh's original Buhl Planetarium and Institute of Popular Science (a.k.a. Buhl Science Center).

* Tue., Jan. 28 - Data Privacy Day. (Jan. 28)

* Tue., Jan. 28, 2:29 a.m. EST / 6:29 UTC - Conjunction: Earth's Moon and Venus. Close approach to Venus by the crescent Moon (Moon passes 4.1 degrees south of Venus), above the western horizon, best viewed at Local Dusk.

* Wed., Jan. 29 - Earned Income Tax Credit (EITC) Awareness Day. (Jan. 29)

* Wed., Jan. 29 - Puzzle Day. (Jan. 29)

* Wed., Jan. 29, 4:28 p.m. EST / 21:28 UTC - Moon at apogee: 251,897.7 statute miles / 405,390 kilometers.

* Fri., Jan. 31 (1958) - Anniversary of the first successful launch, by the USA, of an artificial satellite: Explorer 1. (Jan. 31)

* Fri., Jan. 31 - Earned Income Tax Credit Awareness Day. (Last Friday in January)

Astronomical Calendar: 2020 February
Monthly Observances This Month

2020: Year of the Nurse and the Midwife 2020

Moon Phases:
Today *** Calendar Month
Next 27.32166 Days
(Orbital Period)

Planets, Stars, Sky Events:
Today *** This Week
Solar System *** Occultations
Constellations *** Star Chart

View International Space Station (ISS)
Rocket Launches This Month: Link 1 *** Link 2 *** Link 3 *** Link 4

Equinoxes (EQX), Solstices (SOLC), and Cross-Quarter (XQ) Days For This Year.
Chronological Cycles and Eras For This Year.
Dominical Letters: "E" & "D" - Used in a Perpetual Calendar. For This Leap Year.

Astronomical Glossary
of Terms Used

Astronomical Calendar
Archives

Other
Astronomical Calendars: Link 1 * Link 2

10,000-Year Calendar

Rise & Set Times

Current Sky Events & Astro Phenomena

News: Astronomy, Space, Science --

Weekly: SpaceWatchtower Blog

Daily: SpaceWatchtower Twitter Feed

History of Pittsburgh's Original
Buhl Planetarium and Institute of Popular Science

Astronomy Links

Science Links


a.m. = Ante-Meridiem (Morning: Midnight to a moment before Noon)

p.m. = Post-Meridiem (Afternoon & Evening: a moment after Noon to a moment before Midnight of the next day)

EST = Eastern Standard Time *** EDT = Eastern Daylight Saving Time *** UTC = Coordinated Universal Time

SPECIAL NOTES:
(1) All astronomical or sky observations are always weather-permitting.
(2) For calendar entries which describe a relationship between two or more celestial objects, unless otherwise noted all relationships between celestial objects are visual relationships as seen from Earth only.


* Nov. 1 to April 30 - Use of life jackets by every person on a small boat (less than 16 feet in length), during cold-weather months, is mandatory. (Nov. 1 to April 30)

* Jan. 26 to Feb. 1 - Celebrate Catholic Schools Week. (End of January / Beginning of February)

* Jan. 29 to Feb. 2 - Tax Identity Theft Awareness Week. (Last business week of January / first business week of February).

* Sat., Feb. 1 (2003) - Anniversary of STS Space Shuttle Columbia disintegration during re-entry; seven astronauts perished: Rick Husband, William McCoanol, David Brown, Kalpana Chawla, Michael Anderson, Laurel Clark, Ilan Ramon. (Feb. 1)

* Sat., Feb. 1 (1865) - National Freedom Day -Date in 1865 when U.S. President Abraham Lincoln signed a resolution proposing the Thirteenth Amendment to the United States Constitution prohibiting slavery. (Feb. 1)

* Sat., Feb. 1 - National Change Your Password Day!. (Feb. 1)

* Sat., Feb. 1 - World Read Aloud Day. (Feb. 1)

* Sat., Feb. 1, 8:42 p.m. EST / Feb. 2, 1:42 UTC - Primary Moon Phase: First Quarter.

* 2020 Feb. 2 - ONCE-IN-A-CENTURY CALENDAR-DATE PALINDROME: 02 / 02 / 2020 (palindrome is a sequence of numbers which reads the same forward as it reads backward). ADDITIONALLY, 2020 February 2 is Groundhog Day, Super Bowl Sunday, and the 33rd day of the year, which is followed by 333 more days! The previous calendar-date palindrome was 1111 November 11 (11 / 11 / 1111). The next two calendar-date palendromes will be 2121 December 12 (12 / 12 / 2121) and 3030 March 3 (03 / 03 / 3030).

* Feb. 2 to 8 - World Orphan Week. (1st full week of February)

* Sun., Feb. 2 - Traditional Astronomical Cross-Quarter Day Imbolc, and also Candlemas, better known as Groundhog Day. (First traditional Astronomical Cross-Quarter Day of year; approximate mid-way point in Winter season: Feb. 1 Eve - Feb. 2).
(Groundhog Day at Gobler's Knob, Punxsutawney PA 15767, home of Punxsutawney Phil: - Sunrise: 7:26 a.m. EST / 12:26 UTC) .
Actual Cross-Quarter Day.

* Sun., Feb. 2, 4:00 a.m. EST / 9:00 UTC - Asteroid 4 Vesta 0.5 degree south of the Moon; occultation: southern Asia, eastern portion of Afghanistan, northern section of the Philippines, China, Japan, eastern portion of Russia, Alaska, western portion of Canada.

* Mon., Feb. 3 (1851) - Anniversary: Jean Leon Foucault first demonstrates, before scientists in the Meridian Room of the Paris Observatory, the Foucault Pendulum, which is a proof that the Earth rotates on its axis. He had invented the device on 1851 January 8.
Near the end of his life, Jean Leon Foucault also developed the Siderostat-type Refractor Telescope. (Feb. 3)

* Mon., Feb. 3, 3:55 a.m. EST / Feb. 4, 8:55 UTC - Actual Astronomical Cross-Quarter Day (First actual Astronomical Cross-Quarter Day of year; mid-way point in Winter season: ~Feb. 4).
Traditional Cross-Quarter Day.

* Tue., Feb. 4 - Transit Equity Day to honor Rosa Parks on her birthday, for her act of resistance by refusing to give up her seat on the bus in Montgomery, Alabama in 1955, which was a catalyst for the civil rights movement. (Feb. 4 - birthday of Rosa Parks)

* Tue., Feb. 4 - World Cancer Day (WCD). (Feb. 4)

* Tue., Feb. 4 - Thank A Mailman Day. (Feb. 4)

* Tue., Feb. 4 - Lichun - Beginning of first Solar term (of 24 Solar terms in one year) of traditional East Asia calendars (begins when the Sun reaches the celestial longitude of 315° and ends when it reaches the longitude of 330°); also known as the start of Spring (Occurs each year around Feb. 4)

* Tue., Feb. 4 - African American Coaches Day about the benefits of working with a personal or business coach. (First Tuesday in February)

* Wed., Feb. 5 - National Weatherperson's Day - Birth of one of America's first weather observers, John Jeffries (picture): 1744 February 5. (Feb. 5)

* Wed., Feb. 5, 6:00 p.m. EST / 23:00 UTC - The Moon 1.4 degrees south of Open Star Cluster M35.

* Thur., Feb. 6, 12:49 a.m. EST / 5:49 UTC - NASA astronaut Christina Koch, European Space Agency astronaut Luca Parmitano and Russian cosmonaut Alexander Skvortsov leave the International Space Station, in a Soyuz MS-13 spacecraft, and touch-down near Dzhezkazgan, Kazakhstan ~ 4:14 a.m. EST / 9:14 UTC.

* Fri., Feb. 7 (1863) - Periodic Table (of Chemical Elements) Day. (Feb. 7)

* Fri., Feb. 7 - National Wear Red Day - Go Red for Women movement to heart disease in women (American Heart Association). (First Friday in Feb.)

* Fri., Feb. 7, ~ 11:15 p.m. EST / Feb. 8, 4:15 UTC - United Launch Alliance Atlas V rocket will launch the Solar Orbiter spacecraft for NASA and the European Space Agency from Cape Canaveral Air Force Station in Florida

* Sat., Feb. 8 (1910) - Anniversary of founding of the Boy Scouts of America. (Feb. 8)

* Sat., Feb. 8, 6:00 a.m. EST / 11:00 UTC - The Moon 1.0 degree north of the Beehive Open Star Cluster (M44).

* Sun., Feb. 9 - Autism Sunday / International Day of Prayer for Autism and Asperger Syndrome. (Second Sunday of February)

* Sun., Feb. 9, 2:33 a.m. EST / 7:33 UTC - Primary Moon Phase: Full Moon - Snow Moon.

* Mon., Feb. 10 - National Clean Out Your Computer Day. (Second Monday in February)

* Mon., Feb. 10, 3:00 p.m. EST / 20:00 UTC - Moon at perigee: 223,980.1 statute miles / 360,461 kilometers.

* Tue., Feb. 11 - Safer Internet Day. [Second day (Tuesday) of the second (business) week of February]

* Tue., Feb. 11 (1732) - Anniversary of birth of first American President, George Washington, according to Julian Calendar (also known as "Old Style Calendar"), at use at that time; according to Gregorian Calendar, which we use today, George Washington's birthday occurred on Feb. 22. (Feb. 11)
Science & U.S. Presidents
See also: Washington's Birthday Observed / Presidents' Day * Washington's Birthday Actual (Julian Calendar) * Washington's Birthday Actual (Gregorian Calendar) * Lincoln's Birthday.

* Tue., Feb. 11 - International Day for Women and Girls in Science. (Feb. 11)

* Tue., Feb. 11 - National Inventors' Day, anniversary of the birth of the inventor Thomas Alva Edison. (Feb. 11)

* Tue., Feb. 11 - Zodiacal Light visible, with difficulty after evening twilight (visible for up to an hour after dusk) in the western sky of the Northern Hemisphere, for the next two weeks. (February, March)

* Wed., Feb. 12 (1809) - Anniversary of birth of 16th American President, Abraham Lincoln. (Feb. 12)
Science & U.S. Presidents
See also: Washington's Birthday Observed / Presidents' Day * Washington's Birthday Actual (Julian Calendar) * Washington's Birthday Actual (Gregorian Calendar) * Lincoln's Birthday.

* Wed., Feb. 12 (1809) - Anniversary of birth of English naturalist, Charles Darwin; Darwin Day. (Feb. 12)

* Wed., Feb. 12 - Mercury at perihelion.

* Thur., Feb. 13 - World Radio Day (WRD). (Feb. 13)

* Thur., Feb. 13 - Galentine’s Day - Fun holiday for women, created in 2010 by the NBC-TV program, Parks and Recreation. (Feb. 13 - always day before St. Valentine's Day)

* Thur., Feb. 13, 5:00 a.m. EST / 10:00 UTC - Asteroid 3 Juno 0.6 degree south of the Moon; occultation: most of North America (not including northeastern Canada), Central America, Caribbean, northern portion of South America.

* Fri. through Mon., Feb. 14 to 17 - CITIZEN SCIENCE: The Great Backyard Bird Count. (Presidents' Day holiday weekend, starting on Friday)

* Feb. 14 to 23, 8:00 to 10:00 p.m. Prevailing Local Time - CITIZEN SCIENCE: Monthly Globe at Night campaign, to raise public awareness of the impact of light pollution by encouraging everyone everywhere to measure local levels of night sky brightness and contribute observations on-line to a world map.

* Fri., Feb. 14 - St. Valentine's Day. (Feb. 14)

* Fri., Feb. 14 - Library Lovers Day. (Feb. 14)

* Fri., Feb. 14 - International Book Giving Day. (Feb. 14)

* Fri., Feb. 14 - National Have a Heart Day to promote awareness of our food choices so as to get or maintain a healthy heart. (Feb. 14)

* Fri., Feb. 14 - National Organ Donor Day. (Feb. 14)
Also see: Story of the youngest heart-lungs transplant recipient, who received her first transplant operation shortly after visiting Pittsburgh's Buhl Planetarium in November of 1985.

* Sat., Feb. 15 (1564) - Anniversary: Birth of Italian Astronomer Galileo Galilei. (Feb. 15)

* Sat., Feb. 15 (2013) - Chelyabinsk, Russia Meteor, a super-bolide caused by an approximately 20 m (66 ft) near-Earth asteroid, which caused wide-spread damage in Chelyabinsk, Russia. (Feb. 15)

* Sat., Feb. 15 (1820) - Susan B. Anthony Day - Anniversary of the birth of Susan B. Anthony and commemoration of women's suffrage in the United States. (Feb. 15)

* Sat., Feb. 15 - Singles Awareness Day. (Feb. 15)

* Sat., Feb. 15, 5:17 p.m. EST / 22:17 UTC - Primary Moon Phase: Last Quarter.

* Feb. 16 to 22 - National Engineers Week. [Third or fourth week in February (Sunday through Saturday), which includes George Washington's actual birthday of February 22]

* Feb. 16 to 22 - National Brotherhood / Sisterhood Week. (Week which includes Feb. 22, which coincides with George Washington's birthday)

* Mon., Feb. 17 - Washington's Birthday Observed / Presidents' Day. (USA Federal Holiday: Third Monday in Feb.)
Science & U.S. Presidents
See also: Washington's Birthday Observed / Presidents' Day * Washington's Birthday Actual (Julian Calendar) * Washington's Birthday Actual (Gregorian Calendar) * Lincoln's Birthday.
Also see: The Astronomy President.

* Mon., Feb. 17 (1869) - Anniversary: Periodic Table of Chemical Elements. (Feb. 17)

* Mon., Feb. 17 (2015) - Fireball over Pittsburgh seen in several states. (Feb. 17)

* Mon., Feb. 17 - Random Acts Of Kindness Day. (Feb. 17)

* Tue., Feb. 18 (1930) - Anniversary: Date of discovery of Planet Pluto (now designated Dwarf Planet 134340 Pluto) discovered by Clyde Tombaugh working at Lowell Observatory in Flagstaff, Arizona. (Feb. 18)

* Tue., Feb. 18, 8:17 a.m. EST / 13:17 UTC - Mars 0.8 degree south of the Moon; occultation: most of North America (not including Alaska and western Canada), most of Central America, Caribbean, northern portion of South America, southern tip of Greenland, Azores.

* Wed., Feb. 19 (1473) - Anniversary: Birth of famous Polish astronomer Nicolaus Copernicus. (Feb. 19)
A portrait of Nicolaus Copernicus, donated to Pittsburgh's original Buhl Planetarium and Institute of Popular Science by the Polish Arts League of Pittsburgh, hung on the Mezzanine of Buhl Planetarium.
Also see photograph of the inscription of the name "Copernicus," just under the outer planetarium dome of Pittsburgh's original Buhl Planetarium and Institute of Popular Science.

* Wed., Feb. 19 (1968) - Anniversary: National premiere on National Educational Television (NET - predecessor of PBS, the Public Broadcasting Service) of landmark children's television program, Mister Rogers' Neighborhood, which included puppet character King Friday the 13th (originated at WQED-TV channel 13 in Pittsburgh). (Feb. 19)

* Wed., Feb. 19, 3:00 p.m. EST / 20:00 UTC - Jupiter 0.9 degree north of the Moon; occultation: Antarctica, southern portion of South America.

* Thur., Feb. 20 (1491) - Anniversary: "Comet of 1491" which, until 2002, was considered the closest comet to ever approach the Earth. Today, this comet is not considered the closest comet to ever approach the Earth, due to the unreliability of data. (Feb. 20)
More information.

* Thur., Feb. 20, 3:00 a.m. EST / 8:00 UTC - Dwarf Planet Pluto 0.7 degree north of the Moon; occultation: southeast portion of South America, Antarctica, Kerguelen Islands, southwestern tip of Australia.

* Thur., Feb. 20, 9:00 a.m. EST / 14:00 UTC - Saturn 1.7 degrees north of the Moon.

* Thur., Feb. 20 - Introduce a Girl to Engineering Day. (Thursday of National Engineering Week)

* Fri., Feb. 21 - International Mother Language Day. (Feb. 21)

* Sat., Feb. 22 (1732) - Anniversary of birth of first American President, George Washington, according to Gregorian Calendar, which we use today; according to Julian Calendar (also known as "Old Style Calendar") at use at that time, George Washington's birthday occurred on Feb. 11. (Feb. 22)
Science & U.S. Presidents
See also: Washington's Birthday Observed / Presidents' Day * Washington's Birthday Actual (Julian Calendar) * Washington's Birthday Actual (Gregorian Calendar) * Lincoln's Birthday.

* Sat., Feb. 22 - National Brotherhood Day. (Feb. 22 - coincides with George Washington's birthday)

* Feb. 23 to 29 - Montessori Education Week. (Last week of February / first week of March)

* Sun., Feb. 23, 10:32 a.m. EST / 15:32 UTC - Primary Moon Phase: New Moon - Lunation # 1202.

* Feb. 24 to 28 - Fair Use / Fair Dealing Week, commissioned by the Association of Research Libraries. (Last full business week of February)

* Feb. 24 to 29 - America Saves Week. (Last week of Feb. - Same week as Military Saves Week)

* Feb. 24 to 29 - Military Saves Week. (Last week of Feb. - Same week as America Saves Week)

* Mon., Feb. 24 (1914) - Anniversary: Concept of the Projection Planetarium. (Feb. 24)

* Tue., Feb. 25 - Equilux when considering Civil Twilight (Dawn before sunrise and Dusk after sunset) - When considering Civil Twilight, the day when daylight and darkness, both, have the same length of hours and minutes. Occurs twice each year, approximately 23 days before the Vernal Equinox and 23 days after the Autumnal Equinox. (Feb. 25-26, Oct. 15)

* Tue., Feb. 25 - Mardi Gras / Fat Tuesday / Carnival Tuesday / Shrove Tuesday / Pancake Tuesday / Pancake Day. (Day before Ash Wednesday)

* Tue., Feb. 25 - World Spay Day. (Last Tuesday of every February)

* Tue., Feb. 25, 9:00 p.m. EST / Feb. 26, 2:00 UTC - Mercury in inferior conjunction (Mercury not visible, even with a telescope).

* Wed., Feb. 26 -
** Ash Wednesday
** Beginning of Lent. (First Wednesday in Lent, 46 days before Easter Sunday)
Will Christians Agree to Fix the Date of Easter?

* Wed., Feb. 26, 7:00 p.m. EST / 12:00 UTC - Moon at apogee: 252,449.4 statute miles / 406,278 kilometers.

* Thur., Feb. 27 - Digital Learning Day. (4th Thursday in February)

* Thur., Feb. 27 - International Polar Bear Day. (Feb. 27)

* Thur., Feb. 27, 7:00 p.m. EST / 12:00 UTC - Venus 6 degrees north of the Moon.

* Feb. 28 to March 1 - National Girl Scout Cookie Weekend. (Last weekend of February / first weekend of March)

* Fri., Feb. 28, ~4:55 a.m. Prevailing Local Time - Andromeda Galaxy (M31) rises in the northeastern sky.

* Fri., Feb. 28, 7:00 p.m. EST / 12:00 UTC - Uranus 4 degrees north of the Moon.

* Feb. 29 to March 1 (1504 Feb. 29 to March 1) - Anniversary of total lunar eclipse used by Christopher Columbus, to scare the natives of Jamaica into providing food and other provisions for his sailors. (Feb. 29 to March 1)
Also see first recorded lunar eclipse in continental North America.

* Sat., Feb. 29 - Leap Year Day - Extra day added to the Gregorian Calendar once every four years (in calendar years divisible by four). However, calendar years divisble by 100, but not years divisble by 400, do not contain a Leap Year Day; this was part of the revision of the Julian Calendar, instituted by Pope Gregory XIII in October of 1582, for the last year of each century (hence, the year 2000 did have a Leap Year Day). This additional day is to keep the Gregorian Calendar, a type of Solar Calendar, synchronized with the Earth's revolution around the Sun (Feb. 29): Link 1 *** Link 2.

* Sat., Feb. 29 - Rare Disease Day. (Last day of February: Feb. 28 or 29)

Astronomical Calendar: 2020 March
Monthly Observances This Month

"March roars in like a lion and goes out like a lamb."
(Origin: Constellations Leo the Lion & Aries the Ram)

2020: Year of the Nurse and the Midwife 2020

Standard Time Ends / Daylight Saving Time Resumes
Second Sunday in March at 2:00 a.m. Prevailing Local Time

Spring Begins: ~ March 19, 20, 21

Moon Phases:
Today *** Calendar Month
Next 27.32166 Days
(Orbital Period)

Planets, Stars, Sky Events:
Today *** This Week
Solar System *** Occultations
Constellations *** Star Chart

View International Space Station (ISS)
Rocket Launches This Month: Link 1 *** Link 2 *** Link 3 *** Link 4

Equinoxes (EQX), Solstices (SOLC), and Cross-Quarter (XQ) Days For This Year.
Chronological Cycles and Eras For This Year.
Dominical Letters: "E" & "D" - Used in a Perpetual Calendar. For This Leap Year.

Astronomical Glossary
of Terms Used

Astronomical Calendar
Archives

Other
Astronomical Calendars: Link 1 * Link 2

10,000-Year Calendar

Rise & Set Times

Current Sky Events & Astro Phenomena

News: Astronomy, Space, Science --

Weekly: SpaceWatchtower Blog

Daily: SpaceWatchtower Twitter Feed

History of Pittsburgh's Original
Buhl Planetarium and Institute of Popular Science

Astronomy Links

Science Links


a.m. = Ante-Meridiem (Morning: Midnight to a moment before Noon)

p.m. = Post-Meridiem (Afternoon & Evening: a moment after Noon to a moment before Midnight of the next day)

EST = Eastern Standard Time *** EDT = Eastern Daylight Saving Time *** UTC = Coordinated Universal Time

SPECIAL NOTES:
(1) All astronomical or sky observations are always weather-permitting.
(2) For calendar entries which describe a relationship between two or more celestial objects, unless otherwise noted all relationships between celestial objects are visual relationships as seen from Earth only.


* Nov. 1 to April 30 - Use of life jackets by every person on a small boat (less than 16 feet in length), during cold-weather months, is mandatory. (Nov. 1 to April 30)

* Feb. 28 to March 1 - National Girl Scout Cookie Weekend. (Last weekend of February / first weekend of March)

* March 1 to 7 - National Consumer Protection Week. (First full week of March)

* Sun., March 1 (1504 Feb. 29 to March 1) - Anniversary of total lunar eclipse used by Christopher Columbus, to scare the natives of Jamaica into providing food and other provisions for his sailors. (Feb. 29 to March 1)
Also see first recorded lunar eclipse in continental North America.

* Sun., March 1 - Beginning of Meteorological Spring Season in Northern Hemisphere. (March 1)

* Sun., March 1 - Beginning of Autumn Season in Australia. (March 1)

* Sun., March 1 - St. David's Day. (March 1)

* Sun., March 1 - World Compliment Day. (March 1)

* Sun., March 1, 1:00 a.m. EST / 6:00 UTC - Asteroid 4 Vesta 0.1 degree north of the Moon; occultation: Hawaii, western and northern parts of Australia, eastern portion of Indonesia, northwestern section of Melanesia, Micronesia.

* Mon., March 2 - Read Across America sponsored by the National Education Association to motivate children to read, in addition to helping them master basic skills. (Annual--on or near March 2, birthday of Dr. Seuss)

* Mon., March 2, 2:57 p.m. EST / 19:57 UTC - Primary Moon Phase: First Quarter.

* Mon., March 2, 3:30 to 6:30 p.m. EST / 20:30 to 23:30 UTC - Launch window for launch of first orbital mission by California-based startup company Astra Space, as part of the DARPA Launch Challenge, as a way to develop low-cost launch systems by smaller rocket launch companies.

* Tue, March 3 - World Wildlife Day. (March 3)

* March 4 to 8 - Open Education Week. (First week of March)

* March 4 to 8 - National School Breakfast Week. (First school week of March)

* Wed., March 4 (1681) - Pennsylvania Charter Day - William Penn received charter, for what became the Commonwealth of Pennsylvania, from Great Britain's King Charles II on 1681 March 4. (March 4)

* Wed., March 4 (1793 until 1933, on years divisible by four) - U.S. Presidential Inauguration Day. (March 4)

* Wed., March 4 - National Grammar Day. (March 4)

* Wed., March 4 - World Maths Day. (First Wednesday in March)

* Wed., March 4, 4:00 a.m. EST / 9:00 UTC - Moon 1.2 degrees south of Open Star Cluster M35.

* Thur., March 5 (1868) - Anniversary: Railway Air Brake patented by George Westinghouse in Pittsburgh. (March 5)

* Fri., March 6 (1869) - Professor Dimitri Ivanovich Mendeleev's first Periodic Table of the Elements was presented to, and published by, the Russian Chemical Society. (March 6)

* Fri., March 6 - Employee Appreciation Day. (First Friday of March)

* Fri., March 6, 5:00 p.m. EST / 22:00 UTC - Moon 1.1 degrees north of the Beehive Open Star Cluster (M44).

* March 8 to 14 - Sleep Awareness Week®. (Coincides, each year, with conversion to Daylight Saving Time)

* March 8 to 14 - Teen Tech Week. (March: Second Week)

* March 8 to 14 - Wildfire Prevention Week. [Pennsylvania: Spring (Second week of March), Autumn]

* Sun., March 8 - Day of Planetaria. (Sunday in mid-March)

* Sun, March 8 - International Women's Day. (March 8)

* Sun., March 8, 2:00 a.m. Prevailing Local Time (Standard Time) - DAYLIGHT SAVING TIME BEGINS - Beginning in 2007, EARLY DUE TO NEW FEDERAL LAW. Civil Time changes from 2:00 a.m. Standard Time to 3:00 a.m. Daylight Saving Time (Second Sunday in March, 2:00 a.m. Prevailing Local Time).
Some States to Abandon Daylight Saving Time ?
Science of Daylight Saving Time.

* Sun, March 8, 8:00 a.m. EDT / 12:00 UTC - Neptune in conjunction with the Sun (Neptune not visible, even with a telescope).

* March 9, Sunset to March 10, Sunset (Sunset in Pittsburgh - March 9: 7:21 p.m. EDT / 23:21 UTC; March 10: 7:22 p.m. EDT / 23:22 UTC) - Purim - Jewish holiday that commemorates the saving of the Jewish people from Haman, in the ancient Persian Empire, who was planning to kill all the Jews.

* March 9 to 15 - Brain Awareness Week. (Second full week of March: Monday through Sunday)

* Mon., March 9 - Napping Day. (Monday after the annual beginning of Daylight Saving Time)

* Mon., March 9, 11:00 a.m. EDT / 15:00 UTC - Venus 2 degrees north of Uranus.

* Mon., March 9, 1:48 p.m. EDT / 17:48 UTC - Primary Moon Phase: Full Moon - Worm Moon.
Largest visible, and closest to Earth, Full Moon of 2020.

* March 10 to April 12, September 24 through November 5 - Tsunami Preparedness Weeks. (mid-March through April, mid-September through early November)

* Tue., March 10 (1982) - 1982 date of first alignment of our Solar System's nine planets (including Pluto, which at that time was still considered a planet) since A.D. 1128. A 1974 book, The Jupiter Effect, had erroneously predicted several catastrophes to occur on this date in 1982, including a major earthquake on the San Andreas Fault in California. (March 10)

* Tue., March 10 (1876) - Anniversary: First successful telephone transmission of clear speech - when Alexander Graham Bell transmitted, "Mr. Watson, come here, I want to see you." Three days earlier, on March 7, Alexander Graham Bell received a U.S. patent for the telephone. (March 10)

* Tue., March 10, 2:00 a.m. EDT / 6:00 UTC - Moon at perigee: 221,905 statute miles / 357,122 kilometers.
Large Tides predicted along ocean coast-lines, due to close proximity to Full Moon Primary Phase.

* Wed., March 11 - Zodiacal Light visible, with difficulty, after evening twilight in the western sky of Earth's Northern Hemisphere, for the next two weeks. (February, March)

* Thur., March 12 - World Day Against Cyber Censorship. (March 12)

* Thur., March 12 (1989) - Anniversary of the original proposal founding the World Wide Web on the Internet. (March 12)

* Thur., March 12 (1912) - Anniversary of the founding of the Girl Scouts of the United States of America. (March 12)

* Fri., March 13 - "Friday the 13th" superstition; debunking this superstition, purpose of character King Friday the 13th on popular PBS children's television series, Mister Rogers' Neighborhood (originated at WQED-TV channel 13 in Pittsburgh). (Friday the 13th)

* Fri., March 13 (1781) - Anniversary of the Planet Uranus discovery announced by Sir Frederick William Herschel. (March 13)

* Fri., March 13 (1938), 8:00 a.m. Prevailing Time - Anniversary of beginning of the radio news program CBS World News Roundup, the longest-running, network news broadcast in America. (March 13)

* March 14 to 24, 8:00 to 10:00 p.m. Prevailing Local Time - CITIZEN SCIENCE: Monthly Globe at Night campaign, to raise public awareness of the impact of light pollution by encouraging everyone everywhere to measure local levels of night sky brightness and contribute observations on-line to a world map.

* Sat., March 14 - Pi Day, a holiday commemorating the mathematical constant π (pi). (March 14: 3.14)

* March 15 to 21 - Solar Week. (Mid-to-Late March, Mid-to-Late October)

* Sun., March 15 - Ides of March. (March 15)
Also see: Ides of March article on StarDate.org.

* Sun., March 15 - Buzzards return to Hinckley, Ohio (Cleveland suburb). (March 15)

* Sat., March 15 (1892) - First patent granted for the invention of the escalator, which resulted in production of the first escalator installed on the Old Iron Pier at Coney Island in New York City in 1896. (March 15)

* March 16 to 22 - Fix-a-Leak Week. (U.S. Environmental Protection Agency - third week of March: Monday through Sunday)

* Mon., March 16 - Equilux - The actual day with equal hours and minutes of the Sun above the horizon, and equal hours and minutes of the Sun below the horizon. Occurs twice each year, approximately 3-to-4 days before the Vernal Equinox and 3-to-4 days after the Autumnal Equinox. (March 16, September 25)

* Mon., March 16 - Anniversary: American engineer, professor, physicist, and inventor Robert H. Goddard launched the first liquid-fueled (gasoline and liquid oxygen) rocket. (March 16)

* Mon., March 16 - Freedom of Information Day, the birthday of James Madison, who is widely regarded as the Father of the Constitution and as the foremost advocate for openness in government. (March 16)

* Mon., March 16, 5:34 a.m. EDT / 9:34 UTC - Primary Moon Phase: Last Quarter.

* Tue., March 17 - St. Patrick's Day. (March 17)

* Tue., March 17, 1:43 p.m. EDT / 17:43 UTC - Double-shadow (shadows of 2 Galilean Moons) transit on Jupiter; visible, with difficulty, through telescope after sunset or before sunrise.

* Wed., March 18 - Transit Driver Appreciation Day. (March 18)

* Wed., March 18 - Awkward Moments Day. (March 18)

* Wed., March 18, 4:00 a.m. EDT / 8:00 UTC - Mars 0.7 degree north of the Moon; occultation: southern portion of South America, South Georgia Island, Anarctica, Kerguelen Islands.

* Wed., March 18, 6:00 a.m. EDT / 10:00 UTC - Jupiter 1.5 degrees north of the Moon.

* Wed., March 18, 11:00 a.m. EDT / 15:00 UTC - Dwarf Planet Pluto 0.9 degree north of the Moon; occultation: most of Antarctica.

* Wed., March 18, 8:00 p.m. EDT / March 19, 0:00 UTC - Saturn 2 degrees north of the Moon.

* March 19 to 25 - Pennsylvania Medicine Cabinet Clean-up Week. (Week Beginning with the Vernal Equinox)

* Thur., March 19 (1918) - Anniversary: Standard Time Act authorized by the U.S. Congress, which legally established time zones in the United States. The law also established Daylight Saving Time (DST) to conserve energy during World War I, after being promoted by Pittsburgh business and civic leader Robert Garland. (March 19)
Previously, five North American time zones had been established by the American and Canadian railroads at precisely 12:00 Noon on 1883 November 18, upon a time signal sent over the telegraph from the Allegheny Observatory in Pittsburgh.

* Thur., March 19 - St. Joseph's Day - Swallows return to Mission San Juan Capistrano, California. (March 19)

* Thur., March 19 - World Monopoly Day. (March 19)

* Thur., March 19, 11:50 p.m. EDT / March 20, 3:50 UTC - Vernal Equinox - Spring Season begins in Northern Hemisphere of Earth. (~March 20)
Beginning of New Year (Solar Calendar) in Afghanistan and Iran / Persia (Nowruz), including being a holy day for the Zoroastrian Religion, and Bahá'í Naw-Rúz, one of nine holy days of the Bahá'í Faith. (~ March 19, 20, 21)

* March 20 to April 12 - Annual National Cherry Blossom Festival, Washington DC. (~ Vernal Equinox to mid-April)

* Fri., March 20 - Sun - Earth Day. (NASA: Day of, or near, the Vernal Equinox, the first day of Spring)

* Fri., March 20 - Hypatia Day / Women in Science Day. (March 20)

* Fri., March 20 - Venus at perihelion.

* Fri., March 20, 2:00 a.m. EDT / 6:00 UTC - Mars 0.7 degree south of Jupiter.

* Fri., March 20, 2:21 a.m. EDT / 6:21 UTC - Close Conjunction: Moon approaches Jupiter.

* Sat., March 21 - Galactic Tick Day - Celebrates our Solar System's travel around the Milky Way Galaxy; it takes 230 million years for our Solar System to make one revolution around the Milky Way. The Galactic Tick Day occurs once every 1.7361 years, marking each 1 centi-arc-second of travel in this trek.

* Sat., March 21 - Rosie The Riveter Day, commemorating the World War II poster, created by Pittsburgh's Westinghouse Company, which promoted women doing their part in the war effort. (March 21)

* Sat., March 21 - World Poetry Day. (March 21)

* Sat., March 21 - Kick Butts Day to prevent youth use of tobacco products. (March 21).

* Sat., March 21 (1617) - Anniversary of the Funeral of Native American Pocahontas (a.k.a. Rebecca Rolfe) at age ~ 21. (March 21)

* Sat., March 21, 2:00 p.m. EDT / 18:00 UTC - Mercury 4 degrees north of the Moon.

* Sun., March 22 - World Water Day. (March 22)

* March 23 to 27 - Flood Safety Awareness Week. (Pennsylvania: March).

* Mon., March 23 (1989) - National Near-Miss Day - Apollo Asteroid 1989FC, with a diameter of 300 meters, comes within 690,000 kilometers of the Earth in 1989. (March 23)

* Tue., March 24 - Diabetes Alert Day. (Fourth Tuesday of March)

* Tue., March 24, 5:28 a.m. EDT / 9:28 UTC - Primary Moon Phase: New Moon - Lunation # 1203.

* Tue., March 24, 11:00 a.m. EDT / 15:00 UTC - Moon at apogee: 252,706 statute miles / 406,692 kilometers.

* Tue., March 24, 2:37 p.m. EDT / 19:37 UTC - Double-shadow (shadows of 2 Galilean Moons) transit on Jupiter; visible, with difficulty, through telescope after sunset or before sunrise.

* Wed., March 25 - Feast of the Annunciation observed nine full months before Christmas Day. The Feast of the Annunciation on March 25 (also the Vernal Equinox in the "original" Julian Calendar adopted by the second King of Rome, Numa Pompilius, in the 7th century B.C.) had been considered the beginning of the New Year, until the Gregorian Calendar reform, when Pope Gregory XIII chose the Feast of the Circumcision of Christ (Jan. 1) as the beginning of the New Year in the Roman Catholic Church's Liturgical Year. (March 25)

* Wed., March 25 - Lady Day in England, the first of the four traditional English quarter days, was New Year's Day up to 1752 when, following the move from the Julian Calendar to the Gregorian Calendar, January 1 became the start of the year. Lady Day (for the Virgin Mary) is the traditional name of the Feast of the Annunciation of the Blessed Virgin (March 25) in some English-speaking countries. (March 25)

* Wed., March 25 - National Medal of Honor Day. (March 25)

* Thur., March 26 - Make Up Your Own Holiday Day. (March 26)

* Thur., March 26, 5:00 p.m. EDT / 21:00 UTC - Uranus 4 degrees north of the Moon.

* Fri., March 27 - Mercury at aphelion

* Sat., March 28, 8:30 to 9:30 p.m. Prevailing Local Time - Earth Hour annual environmental observance. (Saturday Late in March, 8:30 to 9:30 p.m. Prevailing Local Time)

* Sat., March 28, 6:37 a.m. EDT / 10:37 UTC - Venus 7 degrees north of the Moon.

* March 29 to April 4 - National Week of the Ocean. (End of March, First Week of April)

* Sun., March 29 (1848) - Anniversary: Ice jam stops flow of Niagara Falls for about 30 hours. (March 29)

* Sun., March 29, 3:00 a.m. EDT / 7:00 UTC - Asteroid 4 Vesta 0.2 degree north of the Moon; occultation: southern Indian Ocean, Indonesia, portions of Southeast Asia, Philippines, Micronesia, northern section of Polynesia (NOT including Hawaii.

* March 30 to April 5 - National Drug & Alcohol Facts Week. (End of March / Beginning of April; Previously 4th week of January)

* Mon., March 30 - Pennsylvania Female Veterans' Day. (March 30)

* Mon., March 30 - National Doctors' Day. (March 30)

* Mon., March 30 - World Bi-Polar Day, International Society for Bi-Polar Disorders, Pittsburgh. (March 30)

* Tue., March 31 - World Back-Up Day. (March 31)

* Tue., March 31 - Last day of Calendar Year First Quarter. (March 31)

* Tue., March 31 - National Crayon Day. (March 31)

* Tue., March 31 (1851) - Anniversary: Jean Leon Foucault first demonstrates, to the general public, in the Pantheon in Paris, the Foucault Pendulum, which is a proof that the Earth rotates on its axis. He had invented the device on 1851 January 8 and first demonstrated it to scientists on 1851 February 3.
Near the end of his life, Jean Leon Foucault also developed the Siderostat-type Refractor Telescope. (March 31)

* Tue., March 31 (1918) - Anniversary: Daylight Saving Time (DST) established in the United States by the Standard Time Act, to conserve energy during World War I, after being promoted by Pittsburgh business and civic leader Robert Garland. However, DST was not popular, and the U.S. Congress repealed the law after the War. (March 31)

* Tue., March 31 (1949) - Anniversary: RCA Victor releases first 45-RPM (revolutions-per-minute) phonograph record format. (March 31)

* Tue., March 31, 6:56 a.m. EDT / 10:56 UTC - Close Planetary Conjunction: Saturn <1 degree north of Mars.

* Tue., March 31, 7:00 a.m. EDT / 11:00 UTC - Moon 0.9 degree south of Saturn.

* Tue., March 31, 12:00 Noon EDT / 16:00 UTC - Moon 0.9 degree south of Open Star Cluster M35.

* Tue., March 31, 6:49 p.m. EDT / 22:49 UTC - Double-shadow (shadows of 2 Galilean Moons) transit on Jupiter; visible, with difficulty, through telescope after sunset or before sunrise.

Astronomical Calendar: 2020 April
Monthly Observances This Month

" April showers bring May flowers !"

2020: Year of the Nurse and the Midwife 2020

Meteor Shower -
Lyrid: April 22

Moon Phases:
Today *** Calendar Month
Next 27.32166 Days
(Orbital Period)

Planets, Stars, Sky Events:
Today *** This Week
Solar System *** Occultations
Constellations *** Star Chart

View International Space Station (ISS)
Rocket Launches This Month: Link 1 *** Link 2 *** Link 3 *** Link 4

Equinoxes (EQX), Solstices (SOLC), and Cross-Quarter (XQ) Days For This Year.
Chronological Cycles and Eras For This Year.
Dominical Letters: "E" & "D" - Used in a Perpetual Calendar. For This Leap Year.

Astronomical Glossary
of Terms Used

Astronomical Calendar
Archives

Other
Astronomical Calendars: Link 1 * Link 2

10,000-Year Calendar

Rise & Set Times

Current Sky Events & Astro Phenomena

News: Astronomy, Space, Science --

Weekly: SpaceWatchtower Blog

Daily: SpaceWatchtower Twitter Feed

History of Pittsburgh's Original
Buhl Planetarium and Institute of Popular Science

Astronomy Links

Science Links


a.m. = Ante-Meridiem (Morning: Midnight to a moment before Noon)

p.m. = Post-Meridiem (Afternoon & Evening: a moment after Noon to a moment before Midnight of the next day)

EST = Eastern Standard Time *** EDT = Eastern Daylight Saving Time *** UTC = Coordinated Universal Time

SPECIAL NOTES:
(1) All astronomical or sky observations are always weather-permitting.
(2) For calendar entries which describe a relationship between two or more celestial objects, unless otherwise noted all relationships between celestial objects are visual relationships as seen from Earth only.


* Nov. 1 to April 30 - Use of life jackets by every person on a small boat (less than 16 feet in length), during cold-weather months, is mandatory. (Nov. 1 to April 30)

* March 10 to April 12, September 24 through November 5 - Tsunami Preparedness Weeks. (mid-March through April, mid-September through early November)

* March 20 to April 12 - Annual National Cherry Blossom Festival, Washington DC. (~ Vernal Equinox to mid-April)

* March 29 to April 4 - National Week of the Ocean. (End of March, First Week of April)

* March 30 to April 5 - National Drug & Alcohol Facts Week. (End of March / Beginning of April; Previously 4th week of January)

* April 1 to 30 - National Kite Month. (April; plus in some years: some days in March and May)

* Wed., April 1 - U.S. Census Day - As required by the U.S. Constitution, the day once every ten years when a census is taken of all people living in the United States of America.

* Wed., April 1 - First day of calendar year Second Quarter. (April 1)

* Wed., April 1 - April Fools' Day - The end of a week-long (March 25 to April 1) New Year's festival in France during the Middle Ages, until January 1 was declared New Year's Day in 1564. After 1564, people in France who celebrated New Year's on April 1 were considered "April Fools." (April 1)

* Wed., April 1 (1960) - Anniversary of launch of first successful weather satellite, TIROS-1. (April 1)
Also see: Space Race To Create Quantum Satellite.

* Wed., April 1 - Global Day of the Engineer. (Early April: First Wednesday of April)

* Wed., April 1 - National Walking Day / Move More in April. (First Wednesday of April)

* Wed., April 1 (1954) - Anniversary of first broadcast of educational television station WQED-TV 13 in Pittsburgh, the nation's first community-supported television station. (April 1)

* Wed., April 1, 6:21 a.m. EDT / 10:21 UTC - Primary Moon Phase: First Quarter.

* Thur., April 2 (1968) - Anniversary: World Premiere of the very influential, science-fiction motion picture, 2001: A Space Odyssey, which was presented in many theaters, including Pittsburgh's Warner Theater, in "Cinerama," an early wide-screen format that preceded the Omnimax format. (April 2)

* Thur., April 2 - Light It Up Blue, in North America, is dedicated to raising awareness of autism (April 2) / World Autism Awareness Day. (April 2)

* Thur., April 2 - Reconciliation Day. (April 2)

* Thur., April 2, 4:00 p.m. EDT / 20:00 UTC - Asteroid 3 Juno at opposition (Juno visible with a telescope, approx. local sunset to local sunrise).

* Fri., April 3 (1513) - Anniversary of the Discovery of Florida by Ponce de Leon. (April 3)

* Fri., April 3, 3:00 a.m. EDT / 7:00 UTC - Moon 1.3 degrees north of Beehive Open Star Cluster (M44).

* Fri., April 3, 11:00 a.m. EDT / 15:00 UTC - Mercury 1.4 degrees south of Neptune.

* Fri., April 3, 4:00 p.m. EDT / 20:00 UTC - Venus 0.3 degree south of the Pleiades Open Star Cluster.

* April 4 to 11 - Money Smart Week®. (Last week of April)

* April 4 to 12 - National Robotics Week. (Early to mid-April)

* Sat., April 4 (1968) - Anniversary: Assassination of American Baptist Minister and civil rights activist Dr. Martin Luther King, Jr. (April 4)
Dr. King's writing on how small the Earth is, compared to the great expanse of the Universe.

* Sat., April 4 - Land-Mine Awareness Day. (April 4)

* Sat., April 4 - Park Day - Annual hands-on preservation event to help Civil War — and now Revolutionary War — battlefields and historic sites take on maintenance projects large and small. (First Saturday of April)

* April 5 to 13 - Holy Week. (Week of Palm Sunday through Holy Saturday; Traditionally, also including Easter Sunday, and possibly including Easter Monday)
Will Christians Agree to Fix the Date of Easter?

* Sun., April 5 - Palm Sunday. (Sunday before Easter Sunday)
Will Christians Agree to Fix the Date of Easter?

* Sun., April 5, 2:00 a.m. Prevailing Local Time (Daylight Saving Time) - DAYLIGHT SAVING TIME CONTINUES - Change in Federal law, thus that change from Standard Time to Daylight Saving Time occured the second Sunday in March: 2:00 a.m. Standard Time then became 3:00 a.m. Daylight Saving Time on the second Sunday in March. (Previously, first Sunday of April)
Some States to Abandon Daylight Saving Time ?
Science of Daylight Saving Time.

* April 6 to 10 - National Retirement Planning Week®. (Early to mid-April)

* April 6 to 12 - National Public Health Week. (First week of April)

* Mon., April 6 (2019) - Anniversary: GPS Week Number Roll-Over Event on Coordinated Universal Time (UTC) derived from GPS devices. The potential problem revolves around the way that GPS handles the week element of the data that forms part of the navigation signal; specifically the CNAV and MNAV message types. The week number is encoded into the data stream by a 10-bit field. A binary 10-bit word can represent a maximum of 1,024 weeks, which is approximately 19.7 years. Each 19.7 year period is known in GPS terms as an “epoch”. At the end of each epoch the receiver resets the week number to zero and starts counting again – a new epoch begins. The first epoch started when GPS was launched in January 1980; hence the first epoch of GPS time came to an end on 21st August 1999. As we approach the end of the second epoch, which will fall on 6th April 2019, we may well see problems caused by the rollover. Some GPS receivers, or other systems that utilise the date and time function, may not be able to cope.

* Mon., April 6 (1965) - Anniversary: launch of Early Bird satellite (Intelsat I), first commercial communications satellite placed in a geo-stationary orbit above the Earth. (April 6)

* Mon., April 6 (1917) - Anniversary: United States entry into World War I. (April 6)

* Mon., April 6 - Tartan Day - Celebration of Scottish heritage. (April 6)

* Tue., April 7 - National Alcohol Screening Day (Early April: April 7)

* Tue., April 7 - No Housework Day. (April 7)

* Tue., April 7, 2:00 p.m. EDT / 18:00 UTC - Moon at perigee: 221,771.7 statute miles / 356,907 kilometers.
Large Tides predicted along ocean coast-lines, due to close proximity to Full Moon Primary Phase.

* Tue., April 7, 10:35 p.m. EDT / April 8, 2:35 UTC - Primary Moon Phase: Full Moon. (Pink Moon)

* Wed., April 8 (1920) - Centennial Anniversary: Death of Astronomer, Educator, and Maker of Telescopes and Precise Scientific Instruments, Dr. John A. Brashear. (April 8)

* Wed., April 8 (1960) - 60th Anniversary: Project Ozma -The first major project in the Search for Extraterrestrial Intelligence (SETI), begun by National Radio Astronomy Observatory (NRAO) researcher Frank Drake pointing an 85-foot / 26-meter radio telescope dish at the NRAO facility at Green Bank, West Virginia toward Tau Ceti, a star similar to our Sun just 12 light-years away. (April 8)

* Wed., April 8 - Holy Wednesday. (Wednesday before Easter Sunday)
Will Christians Agree to Fix the Date of Easter?

* April 8, local sunset to April 16, local sunset (Sunset in Pittsburgh - April 8: 7:53 p.m. EDT / 23:53 UTC; April 16: 8:01 p.m. EDT / April 17, 0:01 UTC) - Jewish festival of Passover.

* Thur., April 9 - Maundy Thursday / Holy Thursday. (Thursday before Easter Sunday)
Will Christians Agree to Fix the Date of Easter?

* Thur., April 9 (1865) - American Civil War ended with the surrender by Confederate General Robert E. Lee. (April 9)
Also see the Civil War Museum of the Andrew Carnegie Free Library and Music Hall in Carnegie, Pennsylvania.

* Thur., April 9, 4:05 a.m. EDT / 8:05 UTC - Russia Soyuz rocket launch with new International Space Station (ISS) Expedition 62 / 63 crewmembers: NASA astronaut Chris Cassidy and two Russian cosmonauts, Anatoli Ivanishin and Ivan Vagner. Docking with ISS scheduled for 10:16 a.m. EDT / 14:16 UTC.

* Fri., April 10 - Good Friday. (Friday before Easter Sunday)
Will Christians Agree to Fix the Date of Easter?

* Fri., April 10 (1845) - 175th Anniversary: The Great Pittsburgh Fire - While the Great Chicago Fire of 1871 is better known, this link is to a painting (1846) of the Great Pittsburgh Fire on 1845 April 10, by witness William Coventry Wall. Started on a very windy day by a woman who started an outdoor fire to heat wash water, which she had left unattended, the Great Pittsburgh Fire consumed one-third of this city of, then, more than 20,000 population (which already had four daily newspapers), representing around two-thirds of the wealth of the city (between $6 million and $12 million damage). While the fire destroyed 1,200 buildings and displaced 12,000 people, only two deaths were reported.

* Fri., April 10 (1996) - World record fastest wind gust on the Earth's surface (not related to a tornado) recorded by automated, unstaffed weather instrument station on Australia's Barrow Island during Tropical Cyclone Olivia: 253 miles per hour. (April 10)
Also see: Western and Northern Hemispheres' record fastest wind gust on the Earth's surface.

* Fri., April 10 - Siblings Day. (April 10)

* April 11 to 17 - The Week of the Young Child™. (Mid-April)

* Sat., April 11 - Holy Saturday. (Saturday before Easter Sunday)
Will Christians Agree to Fix the Date of Easter?

* Sat., April 11 - Be My Neighbor Day Volunteer Day in Pittsburgh. (2nd Saturday in April)

* Sat., April 11 - National Pet Day. (April 11)

* April 12 to 18 - U.S. CFTC’s SmartCheck Week - To Emphasize Continual Background Checks of Financial Professionals. (Second week of April)

* April 12 to 18 - Pan American Week. (Week of April 14, Pan American Day)

* April 12 to 18 - National Minority Cancer Awareness Week. (Third week of April)

* April 12 to 18 - National Dog-Bite Prevention Week. (Second full week of April)

* April 12 to 19 - Orthodox Holy Week. (Week of Orthodox Palm Sunday through Orthodox Holy Saturday; Traditionally, also including Orthodox Easter Sunday)
Will Christians Agree to Fix the Date of Easter?

* Sun., April 12 - Orthodox Palm Sunday. (Sunday before Orthodox Easter Sunday)
Will Christians Agree to Fix the Date of Easter?

* Sun., April 12 (1961) - International Day of Human Space Flight - Anniversary of when Russia launched the first human into space and orbit of the Earth, Yuri Gagarin. (April 12)

* Sun., April 12 (1981) - First launch of an American Space Shuttle (STS), Columbia. (April 12)

* Sun., April 12 (1934) - World record fastest wind gust on the Earth's surface (not related to a tornado), until 1996 April 10, recorded at Mount Washington Weather Observatory, New Hampshire: 231 miles per hour. This is still the fastest wind gust on the Earth's surface (not related to a tornado) recorded in the Western Hemisphere and in the Northern Hemisphere, and the fastest wind gust on the Earth's surface (not related to a tornado) observed by humans. (April 12)
Also see: World record fastest wind gust on the Earth's surface.

* Sun., April 12 (1955) - Announcement of successful polio vaccine, developed by University of Pittsburgh virology researcher Dr. Jonas Salk. (April 12)

* Sun., April 12 (1861) - The American Civil War began. (April 12)
Also see the Civil War Museum of the Andrew Carnegie Free Library and Music Hall in Carnegie, Pennsylvania.

* Sun., April 12 - Drop Everything and Read Day in honor of the birthday of children's author Beverly Cleary. (April 12)

* Sun., April 12 (Sunrise in Pittsburgh: 6:46 a.m. EDT / 10:46 UTC) - Easter Sunday. [46 days after Ash Wednesday; the first Sunday after the full moon (the Paschal Full Moon) following the March equinox (ecclesiastically, the equinox is reckoned to be on March 21, even though the equinox occurs, astronomically speaking, on March 20 in most years)]
Will Christians Agree to Fix the Date of Easter?

* Mon., April 13 - Citizen Science Day. (April 13)

* Mon., April 13 - Scrabble Day. (April 13)

* Mon., April 13 - FND International Awareness Day - Regarding Functional neurological symptom disorder (FNsD). (April 13)

* Mon., April 13 (1970), 10:07:53 p.m. EST / April 14, 3:07:53 UTC
(SPECIAL NOTE: In 1970, Daylight Saving Time did not begin until April 26, the last Sunday in April.) -
50th Anniversary: Apollo 13 Accident.
Apollo 13 aborted mission to land on the Moon after an oxygen tank explosion severely crippled the spacecraft. After a 1970 April 11 launch, the three astronauts, James A. Lovell, John A. "Jack" Swigert, and Fred W. Haise, returned safely to Earth on 1970 April 17. Due to the plan to return Apollo 13 to Earth, after going around the Moon, the Apollo 13 astronauts flew farther from Earth than any other humans, to-date. (April 13)

* April 14 to 15 (1865) - Assassination of U.S. President Abraham Lincoln. (April 14 to 15)
Also see the Civil War Museum of the Andrew Carnegie Free Library and Music Hall in Carnegie, Pennsylvania.

* April 14 to 23, 8:00 to 10:00 p.m. Prevailing Local Time - CITIZEN SCIENCE - Annual Globe at Night campaign, to raise public awareness of the impact of light pollution by encouraging everyone everywhere to measure local levels of night sky brightness and contribute observations on-line to a world map.

* Tue., April 14 - Pan American Day. (April 14)

* Tue., April 14 (1970), 7:21 p.m. EST / April 15, 0:21 UTC
(SPECIAL NOTE: In 1970, Daylight Saving Time did not begin until April 26, the last Sunday in April.) -
Due to the Moon being nearly at apogee (farthest point in lunar orbit from the Earth, for month of 1970 April), the Apollo 13 astronauts became the first humans to travel farther from the Earth than any other humans, which is still true to-date; distance from Earth: 248,655 mile / 400,171 kilometers. This record was necessary, due to the abort of the lunar landing mission of Apollo 13. (April 14)

* Tue., April 14 (1912), 11:40 p.m. (Ship Time) Anniversary of the sinking of the RMS Titanic on the ship's maiden voyage. (April 14)
Also see: Titanic Sunk by the Moon?

* Tue., April 14, 6:00 p.m. EDT / 22:00 UTC - Dwarf Planet Pluto 1.2 degrees north of the Moon; occultation: a portion of the Antarctic Penninsula.

* Tue., April 14, 6:56 p.m. EDT / 22:56 UTC - Primary Moon Phase: Last Quarter.

* Tue., April 14, 7:00 p.m. EDT / 23:00 UTC - Jupiter 2 degrees north of the Moon.

* Mid-April - Big Night for Spring Peepers - First night (or first several nights), after the ground has thawed, with temperatures ~ +40 to +50 degrees Fahrenheit (F), and it rains, when there is a massive migration of frogs and salamanders in New Hampshire and other New England states. (Mid-April)

* Wed., April 15 - Orthodox Holy Wednesday. (Wednesday before Orthodox Easter Sunday)
Will Christians Agree to Fix the Date of Easter?

* Wed., April 15 - SPECIAL NOTE: DEADLINE FOR FEDERAL TAX RETURNS EXTENDED TO WEDNESDAY, 2020 JULY 15, DUE TO COVID-19 EMERGENCY - Tax Day (USA) - Individual Federal tax returns due or postmarked by end of day. (April 15, unless delayed by a holiday)

* Wed., April 15, 12:00 Noon LOCAL SUN TIME - In the middle of April of each year, Sundial Time and Local Clock Time are in general agreement, for locales which lie on a Time-Zone Meridian (such as Philadelphia, which lies on the Eastern Time Zone Meridian - or Greenwich, England, which lies on the Greenwich Time Zone Meridian or Prime Meridian). (~ April 15)

* Wed., April 15, 5:00 a.m. EDT / 9:00 UTC - Saturn 2 degrees north of the Moon.

* April 16 to 22 - Earth Week. (Week leading to and including Earth Day, April 22: April 16 to 22)

* Thur., April 16 - Orthodox Maundy Thursday / Holy Thursday. (Thursday before Orthodox Easter Sunday)
Will Christians Agree to Fix the Date of Easter?

* Thur., April 16 - National Healthcare Decisions Day. (April 16)

* Thur., April 16 - National Stress Awareness Day. (April 16)

* Thur., April 16 - World Voice Day. (April 16)

* Thur., April 16, 1:00 a.m. EDT / 5:00 UTC - Mars 2 degrees north of the Moon.

* Thur., April 16, 9:53 p.m. EDT / April 17, 1:53 UTC - International Space Station (ISS) Expedition 62 Commander, Russian Cosmonaut Oleg Skripochka, hands-over command of ISS to NASA Astronaut Chris Cassidy of Expedition 63. Then, the Soyuz MS-15 spacecraft returns to Earth with Cosmonaut Oleg Skripochka and NASA astronauts Andrew Morgan and Jessica Meir. Scheduled landing near Dzhezkazgan, Kazakhstan: April 17, 1:17 a.m. EDT / 5:17 UTC.

* Fri., April 17 - Orthodox Good Friday. (Friday before Orthodox Easter Sunday)
Will Christians Agree to Fix the Date of Easter?

* Fri., April 17 - World Hemophilia Day. (April 17)

* Fri., April 17 - Blah, Blah, Blah Day. (April 17)

* April 18 to 26 - National Park Week. (Third or fourth week of April, including both weekends)

* April 18, Nov. 27 - Record Store Day. (Second or third Saturday in April & Black Friday in November)

* Sat., April 18 - National Junior Ranger Day. (Saturday in National Park Week)

* Sat., April 18 - Orthodox Holy Saturday. (Saturday before Orthodox Easter Sunday)
Will Christians Agree to Fix the Date of Easter?

* Sat., April 18 - Electrical Lineman Appreciation Day. (April 18)

* April 19 to 26 - International Dark-Sky Week. (Week of the New Moon in April)

* April 19 to 25 - National Library Week. (Second week of April)

* April 19 to 25 - National Volunteer Week. (Mid-April)

* April 19 to 25 - National Sky Awareness Week (SAW), a week set-aside to “look up” and to see the myriad of cloud patterns and formations that grace the sky. (Last full week of April)

* April 19 to 25 - Preservation Week for library and archive materials. (Last week of April)

* April 19 to 25 - National Infertility Awareness Week®. (Last week of April)

* April 19 to 25 - Administrative Professionals Week. (Last full week of April)

* April 19 to 25 - National Re-entry Week. (Last week of April)

* April 19 to 25 - National Crime Victims' Rights Week. (Early to mid-April)

* Sun., April 19 (Sunrise in Pittsburgh: 6:35 a.m. EDT / 10:35 UTC) - Orthodox Easter Sunday. [46 days after Orthodox Ash Wednesday; the first Sunday after the full moon (the Paschal Full Moon) following the March equinox (ecclesiastically, the equinox is reckoned to be on March 21, even though the equinox occurs, astronomically speaking, on March 20 in most years)]
Will Christians Agree to Fix the Date of Easter?

* April 20 to 24 - National Environmental Education Week. (EE Week - Week near Earth Day: April 22)

* April 20 to 24 - Severe Weather Awareness Week. (Pennsylvania: Mid-April)

* April 20 to 24 - National Work Zone Awareness Week. (Early to mid-April)

* Mon., April 20 - Patriots' Day. (Third Monday of April)

* Mon., April 20 (1946) - Dissolution of the League of Nations; succeeded by the United Nations (UN), which was formed on 1945 October 24. (April 20)

* Mon., April 20, Evening - World Night in Defence of the Starlight. (April 20, Evening)

* Mon., April 20, 3:00 p.m. EDT / 19:00 UTC - Moon at apogee: 252,563.8 statute miles / 406,462 kilometers.

* Tue., April 21 - National Library Workers Day. (Tuesday of National Library Week)

* Tue., April 21, 1:00 p.m. EDT / 17:00 UTC - Mercury 3 degrees north of the Moon.

* Wed., April 22 - National Bookmobile Day. (Wednesday of National Library Week)

* Wed., April 22 (1970) - 50th Anniversary: Earth Day. (April 22)

* Wed., April 22 (1994) - Announcement of discovery of the Top Quark, the most massive of all observed elementary particles. (April 22)

* Wed., April 22 - Administrative Professionals Day. (Wednesday of Administrative Professionals' Week, last full week of April)

* Wed., April 22, 2:00 a.m. EDT / 6:00 UTC (Best viewing: Midnight to Dawn) - Peak of Lyrid Meteor Shower. (April 22)

* Wed., April 22, 10:26 p.m. EDT / April 23, 2:26 UTC - Primary Moon Phase: New Moon - Lunation # 1204.

* Thur., April 23 - Teen Literature Day. (Thursday of National Library Week)

* Thur., April 23 - World Book and Copyright Day / World Book Night. (April 23)

* Thur., April 23 - World Laboratory Day. (April 23)

* Thur., April 23 - National Take Our Daughters and Sons To Work Day. (Fourth Thursday of April)

* April 23, Sunset to May 23, Sunset (In Pittsburgh - April 23 Sunset: 8:08 p.m. EDT / April 24, 0:08 UTC; May 23 Sunset: 8:38 p.m. EDT / May 24, 0:38 UTC) - Month of observance of Ramadan in the Islamic religion. The month lasts 29 to 30 days, dependent on visual sightings of the New Crescent Moon.

* April 24 to 30 - World Immunization Week. (April 24 to 30)

* Fri., April 24 - Arbor Day - National Arbor Day Foundation. (Last Friday of April)

* Fri., April 24 (1800) - Library of Congress established by an act of the U.S. Congress. (April 24)

* Fri., April 24 - Teach Children to Save Day. (Last Friday of April)

* April 25 to May 2 - National Infant Immunization Week (NIIW). (Mid-to-late April)

* Sat., April 25 (1953) - DNA Day - Commemorates the day in 1953 when James Watson, Francis Crick, Maurice Wilkins, Rosalind Franklin, and colleagues published papers in the journal Nature on the structure of DNA. (April 25)

* Sat., April 25 - World Penguin Day. (April 25)

* Sat., April 25 - Save the Frogs Day. (Last Saturday in April)
Also see news article.

* Sat., April 25 - World Malaria Day. (April 25)

* Sat., April 25, 10:00 a.m. to 2:00 p.m. Prevailing Local Time - National Prescription Drug Take-Back Day sponsored by the U.S. Drug Enforcement Administration. (Last Saturday in April)

* Sat., April 25 - World Healing Day. (Last Saturday of April)

* Sun., April 26 (1920) - The 1920 Great Debate on the Scale of the Universe between Harlow Shapley of the Mount Wilson Observatory (who gave the keynote address at the 1941 dedication of the rather unique 10-inch Siderostat-Type Refractor Telescope at Pittsburgh's original Buhl Planetarium and Institute of Popular Science) and Allegheny Observatory Director Heber D. Curtis. (April 26)

* Sun., April 26 - World Intellectual Property Day. (April 26)

* Sun., April 26 - Help a Horse Day. (April 26)

* Sun., April 26, 5:00 a.m. EDT / 9:00 UTC - Uranus in conjunction with the Sun (Uranus not visible, even with a telescope).

* Sun., April 26, 7:00 a.m. EDT / 11:00 UTC - Asteroid 4 Vesta 0.1 degree south of the Moon; occultation: central and northeastern portions of Africa, most of the Middle East, southern portion of Kazakhstan, central and northern sections of India, China, most of Southeast Asia, Philippines, southern portion of Japan.

* Sun., April 26, 11:00 a.m. EDT / 15:00 UTC - Venus 6 degrees north of the Moon.

* April 27 to May 2 - International Astronomy Week. (Begins on the Monday preceding the Saturday designated as Astronomy Day)

* Mon., April 27, 6:00 p.m. EDT / 22:00 UTC - Moon 0.7 degree south of Open Star Cluster M35.

* Mon., April 27, 9:00 p.m. EDT / April 28, 1:00 UTC - Greatest brightness of Planet Venus for 2020: Apparent Visual Magnitude of -4.7.

* April 28 to May 6 (2001) - First Outer Space Tourist: Dennis Tito. (April 28 to May 6)

* April 28, 29 - Holocaust Remembrance Days (USA). (April 28, 29)

* Tue., April 28 - Workers' Memorial Day. (April 28)

* April 30, Sept. 30 - National PrepareAthon ! Day - Day to emphasize preparation for disasters and emergencies. (April 30, Sept. 30)

* Thur., April 30 - International Jazz Day. (April 30)

* Thur., April 30, 10:00 a.m. EDT / 14:00 UTC - Moon 1.6 degrees north of Beehive Open Star Cluster (M44).

* Thur., April 30, 4:38 p.m. EDT / 20:38 UTC - Primary Moon Phase: First Quarter.

* Fri., May 1 - Traditional Astronomical Cross-Quarter Day Beltaine, better known as May Day - Second traditional Astronomical Cross-Quarter Day of year; approximate mid-way point in Spring season. (May 1)
Actual Cross-Quarter Day.

* Saturday - May 2, Sept. 26 - Astronomy Day. [Saturday closest to First Quarter Primary Phase of the Moon, in April or May (Spring - Saturday of Astronomy Week) and in September or October (Autumn)]: Link 1 *** Link 2 *** Link 3

* Mon., May 4, 8:49 p.m. EDT / May 5, 0:49 UTC - Actual Astronomical Cross-Quarter Day Beltaine, better known as May Day - Second traditional Astronomical Cross-Quarter Day of year; mid-way point in Spring season (~May 5-6).
Traditional Cross-Quarter Day.

Return to History of The Buhl Planetarium and Institute of Popular Science, Pittsburgh

Astronomical Calendar - A.D. 2020

Authored By Glenn A. Walsh *** Sponsored By Friends of the Zeiss
Electronic Mail: < astrocalendar@planetarium.cc > *** Internet Web Cover Page: < http://www.planetarium.cc >
This Internet Web Page: < http://buhlplanetarium4.tripod.com/astrocalendar/2020.html >
SpaceWatchtower Blog
2020 January

Internet Web Site Master Index for the History of
The Buhl Planetarium and Institute of Popular Science, Pittsburgh

NEWS: Planetarium, Astronomy, Space, and Other Sciences

See an Unexplained Object in the Sky ?
Have a Question About Astronomy or Other Sciences?
Ask an Expert from Friends of the Zeiss !

Other Internet Web Sites of Interest

History of The Buhl Planetarium and Institute of Popular Science, Pittsburgh

History of Adler Planetarium and Astronomy Museum, Chicago

Astronomer, Educator, and Telescope Maker John A. Brashear

History of Andrew Carnegie and Carnegie Libraries

Historic Duquesne Incline cable-car railway, Pittsburgh

Disclaimer Statement: This Internet Web Site is not affiliated with the Andrew Carnegie Free Library,
Ninth Pennsylvania Reserves Civil War Reenactment Group, Henry Buhl, Jr. Planetarium and Observatory,
The Carnegie Science Center, The Carnegie Museums of Pittsburgh/Carnegie Institute, or The Carnegie Library of Pittsburgh.

This Internet, World Wide Web Site administered by Glenn A. Walsh.
Unless otherwise indicated, all pages in this web site are --
© Copyright 2020, Glenn A. Walsh, All Rights Reserved.
Contact Web Site Administrator: < astrocalendar@planetarium.cc >.

This Internet World Wide Web page created on Monday, 2019 Dec. 30.
Last modified : Wednesday, 01-Apr-2020 07:19:14 EDT.

You are visitor number , to this web page, since Monday, 2019 Dec. 30.