Astronomical Calendar - A.D. 2018

Year of the Bird

Dominical Letter: "G" - Used in a Perpetual Calendar. For Year of 2018.


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/2018.html >
SpaceWatchtower Blog
2018 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. 2018

January ** February ** March

April ** May ** June

July ** August ** September

October ** November ** December


2018

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 * 2018 * Today

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

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

Solar System *** Archive

Occultations:

Archive * 2018

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.

2018 Equinoxes (EQX), Solstices (SOLC), and Cross-Quarter (XQ) Days - Archive

* Fri., 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) .

* Sat., Feb. 3, 4:12 p.m. EST / 21:12 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., March 20, 12:15 p.m. EDT / 16:15 UTC - Vernal Equinox - Season of Spring begins in Earth's Northern Hemisphere: beginning of New Year (solar calendar) in Afghanistan and Iran. (~March 20)

* Tue., 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).

* Sat., May 5, 9:13 a.m. EDT / 13:13 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.

* Thur., June 21, 6:07 a.m. EDT / 10:07 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.

* Wed., 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).

* Tue., Aug. 7, 9:27 a.m. EDT / 13:27 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.

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

* Sat., Sept. 22, 9:54 p.m. EDT / Sept. 23, 1:54 UTC - Autumnal Equinox - Season of Autumn begins in Earth's Northern Hemisphere. (~Sept. 22)
Also see: Harvest Moon.

* Wed., Oct. 31 / Thur., Nov. 1 / Fri., 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

* Wed., Nov. 7, 6:18 a.m. EST / 11:18 UTC - Actual Astronomical Cross-Quarter Day (fourth and last actual cross-quarter day of the year: ~Nov. 6-7).
Traditional Cross-Quarter Day.

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

* Fri., Dec. 21, 5:23 p.m. EST / 22:23 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.) 2018 or 2018 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 Letter: "G" - Used in a Perpetual Calendar. For Year of 2018.
Epact: 13.
Golden Number (Lunar Cycle): V.
Julian Period (Year of): 6731.
Roman Indiction: 11.
Solar Cycle (28-year cycle of the Julian calendar): 11.

Byzantine Year 7527 Begins Sept. 14.
Jewish Year (A.M.) 5779 Begins at Sunset, Sept. 10.
Chinese Year of the Earth Dog 4716 Begins Feb. 16.
Roman A.U.C. (Dates from the founding of the City of Rome) Year 2771 Begins Jan. 14.
Nabonassar Year 2767 Begins April 23.
Japanese (Heisei) Year 2678 - Period or Era 30 Begins January 1.
Grecian Year (Selucidae) 2330 Begins Sept. 14 (or Oct. 14).
Indian Year (Saka) 1940 Begins March 22.
Diocletian Era (Era of the Martyrs) Year 1735 Begins Sept. 11.
Islamic (Hegira) Year 1440 Begins at first viewing of lunar crescent (New Moon) on evening of Sept. 11.

NEWS: Astronomy, Space, Science

History of Buhl Planetarium and Institute of Popular Science, Pittsburgh


A.D. 2018

Astronomical Calendar: 2018 January
Monthly Observances This Month

Year of the Bird

Total Lunar Eclipse: Jan. 31

* 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 ISS (Space Station)

2018 Equinoxes (EQX), Solstices (SOLC), and Cross-Quarter (XQ) Days
2018 Chronological Cycles and Eras
Dominical Letter: "G" - Used in a Perpetual Calendar. For Year of 2018.

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


* 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)

* Sun., 2017 Dec. 31 - Make Up Your Mind Day. (Dec. 31)

* Sun., 2017 Dec. 31 - Eve of New Year's Day (Traditional). (Dec. 31)

* Sun., 2017 Dec. 31, 6:59:60 p.m. EST / 23:59:60 UTC - Positive 'Leap Second' added to the civil time scale, to help keep clocks synchronized with the slowing rotation rate of the Earth. (Periodically: last additional second of last minute of June 30 and / or December 31)

* Sun., 2017 Dec. 31, 7:00:00 p.m. EST / 2018 Jan. 1, 00:00:00 UTC - Marks the beginning of the New Year by the Coordinated Universal Time scale, the time scale used by many scientists. (Dec. 31)

* Mon., 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)

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

* Mon., 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)

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

* Mon., Jan. 1, 12:00:00 Midnight (00:00:00) 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)

* Mon., Jan. 1, 5:00 p.m. EST / 22:00 UTC - Moon at perigee - Distance to Earth: 221,559 statute miles / 356,565 kilometers.
Large tides predicted along ocean coastlines, due to proximity to the time of a Full Moon, this month a so-called "Super-Moon."

* Mon., Jan. 1, 9:24 p.m. EST / Jan. 2, 2:24 UTC - Primary Moon Phase: Full Moon (Wolf Moon).
Closest to Earth, and largest in appearance, Full Moon of 2018; a so-called "Super-Moon."

* Wed., Jan. 3 - U.S. Congress begins second session of 115th Congress, U.S. Capitol Building, Washington DC. (Jan. 3)

* Wed., Jan. 3, 1:00 a.m. EST / 6:00 UTC - Earth at perihelion (closest Earth approach to the Sun in New Year): 91,401,982 statute miles / 147,097,233 kilometers. (Jan. 2 to 4)

* Wed., Jan. 3, 2:37 p.m. EST / 19:37 UTC - Moon passes very close to Beehive Open Star Cluster, as viewed from Earth.

* Wed., Jan. 3, 4:00 p.m. EST / 21:00 UTC - (Best viewing: Midnight to Dawn) - Peak of Quadrantid Meteor Shower. (Jan. 3 to 4)

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

* Thur., Jan. 4, 9:34 p.m. EST / Jan. 5, 2:34 UTC - Double-shadow (shadows of 2 Galilean Moons) transit on Jupiter; visible, with difficulty, through telescope after sunset or before sunrise.

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

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

* Fri., Jan. 5, 3:00 a.m. EST / 8:00 UTC - Star Regulus 0.9 degree south of the Moon; occultation: Alaska, northern Canada, extreme eastern portion of Russia, Greenland, Iceland, Svalbard (Norway), most of Europe, northwestern portion of Africa.

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

* Jan. 6 to 15 - 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., 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)

* Sat., Jan. 6, 11:00 p.m. EST / Jan. 7, 4:00 UTC - Mars 0.2 degree south of Jupiter.

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

* Jan. 7 to 13 - Winter Driving Awareness Week.

* Mon., 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)

* Mon., 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)

* Mon., Jan. 8 - National Clean Off Your Desk Day. (2nd Monday of January)

* Mon., Jan. 8, 5:25 p.m. EST / 22:25 UTC - Primary Moon Phase: Last Quarter.

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

* Tue., Jan. 9, 2:00 a.m. EST / 7:00 UTC - Venus at superior conjunction with the Sun (Venus not visible, even with a telescope).

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

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

* Thur., Jan. 11, 1:00 a.m. EST / 6:00 UTC - Jupiter 4 degrees south of the Moon.

* Thur., Jan. 11, 5:00 a.m. EST / 10:00 UTC - Mars 5 degrees south of the Moon.

* Thur., Jan. 11, 11:00 p.m. EST / Jan. 12, 4:00 UTC - Asteroid 4 Vesta 0.4 degree north of the Moon; occultation: southern Africa, Madagascar, Antarctica (France portion), southwestern portion of Australia, Tasmania.

* Fri., Jan. 12, 12:45 a.m. EST / 5:45 UTC - Double-shadow (shadows of 2 Galilean Moons) transit on Jupiter; visible, with difficulty, through telescope after sunset or before sunrise.

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

* Sat., Jan. 13, 2:00 a.m. EST / 7:00 UTC - Mercury 0.6 degree south of Saturn.

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

* Sun., Jan. 14, 9:00 p.m. EST / Jan. 15, 2:00 UTC - Saturn 3 degrees south of the Moon.

* Sun., Jan. 14, 9:00 p.m. EST / Jan. 15, 2:00 UTC - Moon at apogee - Distance from Earth: 252,565 statute miles / 406,464 kilometers.

* Mon., Jan. 15, 2:00 a.m. EST / 7:00 UTC - Mercury 3 degrees south of the Moon.

* Mon., 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)

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

* Wed., 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)

* Wed., Jan. 17, 9:17 p.m. EST / Jan. 18, 2:17 UTC - Primary Moon Phase: New Moon - Lunation # 1176.

* Fri., Jan. 19, 4:43 a.m. EST / 9:43 UTC - Double-shadow (shadows of 2 Galilean Moons) transit on Jupiter; visible, with difficulty, through telescope after sunset or before sunrise.

* Sat., Jan. 20, 3:30 a.m. EST / 20:30 UTC - Moon passes very close to Neptune, as viewed from Earth.

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

* Jan. 22 to 28 - National Drug & Alcohol Facts Week. (4th week of January)

* Tue., Jan. 23 - Venus aphelion.

* Tue., Jan. 23, 11:01 p.m. EST / Jan. 25, 4:01 UTC - Moon passes close to Uranus, as viewed from Earth.

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

* Wed., Jan. 24, 5:20 p.m. EST / 22:20 UTC - Primary Moon Phase: First Quarter.

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

* Thur., Jan. 25, 6:24 a.m. EST / 11:24 UTC - Mercury aphelion.

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

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

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

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

* Sat., Jan. 27, 6:00 a.m. EST / 11:00 UTC - Star Aldebaran 0.7 degree south of the Moon; occultation: Alaska, northwestern portion of North America, Mongolia, most of China, most of Russia, most of India, central portion of Asia.

* Jan. 28 to Feb. 3 - National Catholic Schools Week. (End of January / Beginning of February)

* Sun., 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).

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

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

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

* Mon., Jan. 29 - National Bubble-Wrap Appreciation Day, first used by IBM to safely ship computers in 1961. (Last Monday of January)

* Tue., Jan. 30, 5:00 a.m. EST / 10:00 UTC - Moon at perigee - Distance from Earth: 223,068 statute miles / 358,994 kilometers.
Large tides predicted along ocean coastlines, due to proximity to the time of a Full Moon, this month a so-called "Super-Moon."

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

* Wed., Jan. 31, 8:00 a.m. EST / 13:00 UTC - Asteroid Ceres at opposition (Ceres visible, with difficulty in a telescope, approx. local sunset to local sunrise).

* Wed., Jan. 31, 8:27 a.m. EST / 13:27 UTC - Full Moon: "Blue Moon", second Full Moon in a calendar month.
Another so-called "Super-Moon."

* Wed., Jan. 31, 8:29:49.6 a.m. EST / 13:29:49.6 UTC - Time of greatest eclipse for Total Eclipse of the Moon, visible over most of the Earth except most of South America, most of Africa, Western Europe, and Antarctica.
An Eclipse of the Moon / Lunar Eclipse is the type of eclipse completely safe to watch with telescopes, binoculars, and the naked-eyes.

Astronomical Calendar: 2018 February
Monthly Observances This Month

Year of the Bird

Eclipse in 2018 February ---
Partial Solar Eclipse: Feb. 15

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 ISS (Space Station)

2018 Equinoxes (EQX), Solstices (SOLC), and Cross-Quarter (XQ) Days
2018 Chronological Cycles and Eras
Dominical Letter: "G" - Used in a Perpetual Calendar. For Year of 2018.

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


* 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. 28 to Feb. 3 - National 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).

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

* Thur., 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)

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

* Thur., Feb. 1 - World Read Aloud Day.

* Thur., Feb. 1, 2:00 p.m. EST / 19:00 UTC - Star Regulus 1.0 degree south of the Moon; occultation: northwestern portion of Alaska, majority of Japan, northeastern portion of China, eastern and northern portions of Russia, northern portion of Greenland, Scandinavia, Svalbard (island of Norway).

* Fri., 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: 7:25 a.m. EST / 12:25 UTC) .
Actual Cross-Quarter Day.

* Fri., Feb. 2 - 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)

* Fri., Feb. 2 - National Wear Red Day - Go Red for Women movement to heart disease in women (American Heart Association). (First Friday in Feb.)

* Sat., 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)

* Sat., Feb. 3, 4:12 p.m. EST / 21:12 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.

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

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

* Sun., 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)

* Feb. 5 to 14, 8:00 to 10:00 p.m. Prevailing Local Time - CITIZEN SCIENCE: 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.

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

* Tue., Feb. 6 - Safer Internet Day. [Second day (Tuesday) of the second (business) week of February]

* Tue., Feb. 6 - African American Coaches Day about the benefits of working with a personal or business coach. (First Tuesday in February)

* Wed., Feb. 7, 10:54 a.m. EST / 15:54 UTC - Primary Moon Phase: Last Quarter.

* Wed., Feb. 7, 3:00 p.m. EST / 20:00 UTC - Jupiter 4 degrees south of the Moon.

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

* Thur., Feb. 8, 8:25 a.m. EST / 13:25 UTC - Venus enters Zodiac Constellation Aquarius.

* Fri., Feb. 9, 12:00 Midnight EST / 5:00 UTC - Mars 4 degrees south of the Moon.

* Fri., Feb. 9, 2:00 a.m. EST / 7:00 UTC - As it appears in Earth's sky, the Moon moves close to Mars.

* Fri., Feb. 9, 8:00 a.m. EST / 13:00 UTC - Asteroid 4 Vesta 0.9 degree north of the Moon; occultation: most of the Antarctic Continent, Chatham Island (island of New Zealand).

* Sun., 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)
See also: Washington's Birthday Observed / Presidents' Day * Washington's Birthday Actual (Julian Calendar) * Washington's Birthday Actual (Gregorian Calendar) * Lincoln's Birthday.

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

* Sun., Feb. 11 - Autism Sunday / International Day of Prayer for Autism and Asperger Syndrome. (Second Sunday of February)

* Sun., Feb. 11, 9:00 a.m. EST / 14:00 UTC - Moon at apogee: 252,090 statute miles / 405,700 kilometers.

* Sun., Feb. 11, 10:00 a.m. EST / 15:00 UTC - Saturn 2 degrees south of the Moon.

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

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

* Mon., Feb. 12 - National Clean Out Your Computer Day. (Second Monday in February)

* Mon., Feb. 12, 2:41 p.m. EST / 19:41 UTC - As it appears in Earth's sky, the Moon moves very close to Dwarf Planet Pluto.

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

* Tue., Feb. 13 - Shrove Tuesday / Fat Tuesday. (Day before Ash Wednesday)

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

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

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

* Wed., 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)

* Wed., Feb. 14 - National Organ Donor Day. (Feb. 14)

* Wed., Feb. 14 - Ash Wednesday, the beginning of Lent. (First Wednesday in Lent, 46 days before Easter Sunday)
Will Christians Agree to Fix the Date of Easter?

* Wed., Feb. 14, 6:00 a.m. EST / 11:00 UTC - Asteroid 3 Juno in conjunction with the Sun (Juno not visible, even with a telescope).

* Thur., Feb. 15 (1564) - Anniversary of the birth of Italian Astronomer Galileo Galilei. (Feb. 15)

* Thur., 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)

* Thur., Feb. 15, 3:51:24.3 p.m. EST / 20:51:24.3 UTC - Time of greatest eclipse for A deep Partial Solar Eclipse visible in 2/3 of the Antarctic Continent, eastern portion of the Australian Continent, New Zealand, and much of the South American Continent: Link 1 *** Link 2
NEVER look directly at a Solar Eclipse or Eclipse of the Sun unless you have the training and proper equipment to do so safely!
SOLAR ECLIPSE / ECLIPSE OF THE SUN: TIPS FOR SAFE VIEWING

* Thur., Feb. 15, 4:05 p.m. EST / 21:05 UTC - Primary Moon Phase: New Moon - Lunation # 1177.

* Fri. through Mon., Feb. 16, 17, 18, 19 - CITIZEN SCIENCE: The Great Backyard Bird Count. (Presidents' Day holiday weekend, starting on Friday)

* Fri., Feb. 16 - Chinese New Year, based on a lunisolar calendar of which dates indicate both the moon phase and the time of the solar year. This marks the beginning of the Chinese Year of the Earth Dog: Link 1 *** Link 2.

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

* Sat., Feb. 17, 7:27 a.m. EST / 12:27 UTC - Mercury in superior conjunction with the Sun (Mercury not visible, even with a telescope).

* Feb. 18 to 24 - National Engineers Week. (Third or fourth week in February, which includes George Washington's actual birthday of February 22)

* Sun., 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)

* Sun., Feb. 18, 12:18 p.m. EST / 17:18 UTC - The Sun enters Zodiac Constellation Pisces.

* Feb. 19 to 23 - Fair Use / Fair Dealing Week, commissioned by the Association of Research Libraries. (Last full business week of February)

* Mon., Feb. 19 (1473) - Anniversary of the 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.

* Tue., Feb. 20 (1491) - Anniversary of the "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.

* Tue., Feb. 20 - Washington's Birthday Observed / Presidents' Day. (USA Federal Holiday: Third Monday in Feb.)
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.

* Tue., Feb. 20, 5:57 a.m. EST / 10:57 UTC - As it appears in Earth's sky, Moon moves close to Uranus.

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

* Wed., Feb. 21, 1:44 p.m. EST / 18:44 UTC - As it appears in Earth's sky, Venus and Neptune appear very close.

* Thur., 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)
See also: Washington's Birthday Observed / Presidents' Day * Washington's Birthday Actual (Julian Calendar) * Washington's Birthday Actual (Gregorian Calendar) * Lincoln's Birthday.

* Thur., Feb. 22 - Introduce a Girl to Engineering Day. (Thursday of National Engineering Week)

* Thur., Feb. 22 - Digital Learning Day. (4th Thursday in February)

* Feb. 23, 24, 25, - National Girl Scout Cookie Weekend. (Last weekend of February / first weekend of March)

* Fri., Feb. 23, 3:09 a.m. EST / 8:09 UTC - Primary Moon Phase: First Quarter.

* Fri., Feb. 23, 1:00 p.m. EST / 18:00 UTC - Star Aldebaran 0.7 degree south of the Moon; occultation: northeastern portion of North America, Greenland, Bermuda, majority of Europe, Svalbard (island of Norway), majority of Russia, Kazakhstan, western portion of Mongolia, northwestern portion of China.

* Sat., Feb. 24 (1914) - Anniversary of the concept of the Projection Planetarium. (Feb. 24)

* Feb. 25 to March 3 - Montessori Education Week. (Last week of February / first week of March)

* Sun., 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)

* Sun., Feb. 25, 7:47 p.m. EST / 12:47 UTC - As it appears in Earth's sky, Mercury and Neptune appear very close.

* Feb. 26 to March 3 - America Saves Week. (Last week of Feb. - Same week as Military Saves Week)

* Feb. 26 to March 3 - Military Saves Week. (Last week of Feb. - Same week as America Saves Week)

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

* Tue., Feb. 27 - World Spay Day. (Last Tuesday of every February)

* Tue., Feb. 27, 10:00 a.m. EST / 15:00 UTC - Moon at perigee: 226,136 statute miles / 363,932 kilometers.

* Tue., Feb. 27, 12:15 p.m. EST / 17:15 UTC - As it appears in Earth's sky, the Moon moves very close to the Beehive Open Star Cluster.

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

* Thur., 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.

Astronomical Calendar: 2018 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)

Year of the Bird

Daylight Saving Time Begins March 11

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 ISS (Space Station)

2018 Equinoxes (EQX), Solstices (SOLC), and Cross-Quarter (XQ) Days
2018 Chronological Cycles and Eras
Dominical Letter: "G" - Used in a Perpetual Calendar. For Year of 2018.

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


* 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. 25 to March 3 - Montessori Education Week. (Last week of February / first week of March)

* Feb. 26 to March 3 - America Saves Week. (Last week of Feb.)

* Feb. 26 to March 3 - Military Saves Week.

* February 28, Sunset to March 1, Sunset (Sunset in Pittsburgh - Feb. 28: 6:10 p.m. EST / 23:10 UTC; March 1: 6:12 p.m. EST / 23:12 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.

* Thur., 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.

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

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

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

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

* Thur., March 1, 1:00 a.m. EST / 6:00 UTC - Star Regulus 0.9 degree south of the Moon; occultation: northern portion of North America, Greenland, Svalbard archipelago in the Arctic Ocean (Norway), extreme western portion of Europe, Azores Autonomous archipelago of Portugal, extreme northeastern portion of Russia.

* Thur., March 1, 7:51 p.m. EST / March 2, 0:51 UTC - Primary Moon Phase: Full Moon (Snow Moon).

* Fri., 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)

* Fri., March 2 - Employee Appreciation Day. (First Friday of March)

* Fri., March 2, 6:56 a.m. EST / 11:56 UTC - Mercury enters Constellation Pisces the Fishes, as it appears in the sky.

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

* March 4 to 10 - Teen Tech Week.

* March 4 to 10 - National Consumer Protection Week. (First full week of March)

* Sun., 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)

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

* Sun., March 4, 12:40 a.m. EST / 5:40 UTC - Mercury and Venus appear in the sky very close.

* Sun., March 4, 9:00 a.m. EST / 14:00 UTC - Neptune in conjunction with the Sun (Neptune not visible, even with a telescope).

* March 5 to 9 - Open Education Week. (First week of March)

* Mon., March 5 - Zodiacal Light visible, with difficulty, after evening twilight in the western sky of the Northern Hemisphere, for the next two weeks. (February, March)

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

* Wed., March 7 - World Maths Day. (First Wednesday in March)

* Wed., March 7, 2:00 a.m. EST / 7:00 UTC - Jupiter 4 degrees south of the Moon.

* Wed., March 7, 7:01 a.m. EST / 12:01 UTC - As it appears in the sky, the Moon moves close to Jupiter.

* March 8 to 17, 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.

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

* Fri., March 9, 6:20 a.m. EST / 11:20 UTC - Primary Moon Phase: Last Quarter.

* Fri., March 9, 8:00 p.m. EST / March 10, 1:00 UTC - Mars 4 degrees south of the Moon.

* Sat., 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)

* Sat., 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)

* Sat., March 10 - Mercury at perihelion.

* Sat., March 10, 9:00 p.m. EST / March 11, 2:00 UTC - Saturn 2 degrees south of the Moon (appears closest March 10, 9:25 p.m. EST / March 11, 2:25 UTC).

* March 11 to April 30, September 24 through November 5 - Tsunami Preparedness Weeks. (mid-March through April, mid-September through early November)

* March 11 to 17 - Sleep Awareness Week®. (Last day of week coincides, each year, with conversion to Daylight Saving Time)

* March 11 to 17 - Wildfire Prevention Week. [Pennsylvania: Spring (Second week of March), Autumn]

* Sun., March 11 - Day of Planetaria. (Sunday in mid-March)

* Sun., March 11, 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 11, 5:17 a.m. EDT / 9:17 UTC - Moon at apogee: 251,455.251332218 statute miles / 404,678 kilometers.

* March 12 to 18 - Brain Awareness Week. (Second full week of March: Monday through Sunday)

* Mon., March 12 - Napping Day. (Monday after the annual beginning of Daylight Saving Time)

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

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

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

* Mon., March 12, 12:33 a.m. EDT / 4:33 UTC - As it appears in the sky, the Moon moves very close to Dwarf Planet Pluto.

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

* Tue., 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)

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

* Wed., March 14, 7:08 a.m. EDT / 11:08 UTC - As it appears in the sky, Venus enters Constellation Pisces the Fishes.

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

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

* Thur., 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)

* Fri., 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)

* Fri., 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)

* Fri., March 16, 9:31 a.m. EDT / 13:31 UTC - As it appears in the sky, the Moon moves very close to Neptune.

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

* Sat., March 17, 9:12 a.m. EDT / 13:12 UTC - Primary Moon Phase: New Moon - Lunation # 1178.

* Sun., March 18, 3:00 p.m. EDT / 19:00 UTC - Venus 4 degrees north of the Moon (appear closest 5:37 p.m. EDT / 21:37 UTC).

* March 19 to 25 - Fix-a-Leak Week. (U.S. Environmental Protection Agency - third week of March: Monday through Sunday)

* March 19 to 23 - Solar Week. (Mid-to-Late March, Mid-to-Late October)

* Mon., March 19 (1918) - Centennial Anniversary: Standard Time Act authorized by the U.S. Congress, which legally established time zones in the United States. 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. 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.

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

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

* Mon., March 19, 4:16 a.m. EDT / 8:16 UTC - As it appears in the sky, Mercury and Venus are close.

* March 20 to 26 - Pennsylvania Medicine Cabinet Clean-up Week. (Week Beginning with the Vernal Equinox)

* March 20 to April 15 - Annual National Cherry Blossom Festival, Washington DC. (~ Vernal Equinox to mid-April)

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

* Tue., March 20, 12:15 p.m. EDT / 16:15 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)

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

* Wed., 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.

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

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

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

* Thur., March 22, 7:00 p.m. EDT / 23:00 UTC - Star Aldebaran 0.9 degree south of the Moon; occultation: northwestern portion of North America, Greenland, Svalbard archipelago in the Arctic Ocean (Norway), United Kingdom, Ireland, majority of Scandinavia, northeastern portion of Russia.

* Fri., 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)

* Sat., March 24, 11:35 a.m. EDT / 15:35 UTC - Primary Moon Phase: First Quarter.

* Sat., March 24, 5:22 p.m. EDT / 21:22 UTC - Double-shadow (shadows of 2 Galilean Moons) transit on Jupiter; visible, with difficulty, through telescope after sunset or before sunrise.

* Sat., March 24, 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)

* March 25 to 31 - National Week of the Ocean.

* March 25 to April 2 - 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., March 25 - Palm Sunday. (Sunday before Easter Sunday)
Will Christians Agree to Fix the Date of Easter?

* Sun., 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)

* Sat., 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)

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

* March 26 to 30 - Flood Safety Awareness Week. (Pennsylvania: March).

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

* Mon., March 26, 1:00 p.m. EDT / 17:00 UTC - Moon at perigee: 229,351.835281952 statute miles / 369,106 kilometers.

* Mon., March 26, 8:40 p.m. EDT / March 27, 0:40 UTC - As it appears in the sky, the Moon moves very close to the Beehive Open Star Cluster.

* Tue., March 27 - Diabetes Alert Day. (Fourth Tuesday of March)

* Wed., March 28 - Holy Wednesday. (Wednesday before Easter Sunday)
Will Christians Agree to Fix the Date of Easter?

* Wed., March 28, 10:00 a.m. EDT / 14:00 UTC - Star Regulus 1.0 degree south of the Moon; occultation: northwestern portion of North America, Aleutian Islands (Alaska), northern portion of Greenland, Svalbard archipelago in the Arctic Ocean (Norway), majority of Scandinavia, northern and eastern portions of Russia.

* Wed., March 28, 8:00 p.m. EDT / March 29, 0:00 UTC - Venus 0.07 degree south of Uranus.

* Thur., March 29 - Maundy Thursday / Holy Thursday. (Thursday before Easter Sunday)
Will Christians Agree to Fix the Date of Easter?

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

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

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

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

* Fri., March 30 - Good Friday. (Friday before Easter Sunday)
Will Christians Agree to Fix the Date of Easter?

* Fri., March 30, 1:59 a.m. EDT / 5:59 UTC - As it appears in the sky, Venus enters Constellation Aries the Ram.

* March 31, local sunset to April 7, local sunset (Sunset in Pittsburgh - March 31: 7:44 p.m. EDT / 23:44 UTC; April 7: 7:51 p.m. EDT / 23:51 UTC) - Jewish festival of Passover.

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

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

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

* Sat., 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)

* Sat., March 31 (1918) - Centennial 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)

* Sat., March 31 - Holy Saturday. (Saturday before Easter Sunday)
Will Christians Agree to Fix the Date of Easter?

* Sat., March 31, 8:37 a.m. EDT / 12:37 UTC - Primary Moon Phase: Full Moon (Worm Moon) - "Blue Moon", second Full Moon in a calendar month.

* Sun., April 1 (Sunrise in Pittsburgh: 7:04 a.m. EDT / 11:04 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 2 - Easter Monday. (Monday after Easter Sunday)
Will Christians Agree to Fix the Date of Easter?

* Sun., April 8 (Sunrise in Pittsburgh: 6:52 a.m. EDT / 10:52 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?

Astronomical Calendar: 2018 April
Monthly Observances This Month

" April showers bring May flowers !"

Year of the Bird

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 ISS (Space Station)

2018 Equinoxes (EQX), Solstices (SOLC), and Cross-Quarter (XQ) Days
2018 Chronological Cycles and Eras
Dominical Letter: "G" - Used in a Perpetual Calendar. For Year of 2018.

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


* 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 17 to April 15 - Annual National Cherry Blossom Festival, Washington DC. (~ Vernal Equinox to mid-April)

* March 19 to April 30, September 24 through November 5 - Tsunami Preparedness Weeks. (mid-March through April, mid-September through early November)

* March 25 to April 2 - 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?

* March 26 to April 1 - National Week of the Ocean.

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

* 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)

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

* Sun., April 1 (Sunrise in Pittsburgh: 7:04 a.m. EDT / 11:04 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?

* Sun., 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)

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

* Sun., 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)

* Sun., April 1, 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.

* Sun., April 1, 2:00 p.m. EDT / 18:00 UTC - Mercury in inferior conjunction with the Sun (Mercury not visible, even with a telescope).

* April 2 to 8 - National Public Health Week. (First week of April)

* Mon., April 2 (1968) - 50th Anniversary of the 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.

* Mon., April 2 - Easter Monday. (Monday after Easter Sunday)
Will Christians Agree to Fix the Date of Easter?

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

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

* Mon., April 2, 8:48 a.m. EDT / 12:48 UTC - Mars 1.3 degrees south of Saturn.

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

* Tue., April 3, 10:00 a.m. EDT / 14:00 UTC - Jupiter 4 degrees south of the Moon (closest apparent approach of the Moon at 12:12 p.m. EDT / 16:12 UTC) .

* Wed., April 4 - 50th Anniversary of the 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.

* Wed., April 4 - Global Day of the Engineer. (Early April: First Wednesday of April)

* Wed., April 4 - National Walking Day / Move More in April. (First Wednesday of April)

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

* April 6 to 15, 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.

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

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

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

* April 7 to 15 - National Robotics Week. (Early to mid-April)

* Sat., April 7 - 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)

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

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

* Sat., April 7, 9:00 a.m. EDT / 13:00 UTC - Saturn 1.9 degrees south of the Moon.

* Sat., April 7, 2:12 p.m. EDT / 18:12 UTC - Mars 3 degrees south of the Moon.

* April 8 to 14 - National Library Week. (Second week of April)

* April 8 to 14 - Pan American Week. (Week of April 14, Pan American Day)

* April 8 to 14 - U.S. CFTC’s SmartCheck Week - To Emphasize Continual Background Checks of Financial Professionals. (Second week of April)

* April 8 to 14 - National Crime Victims' Rights Week. (Early to mid-April)

* April 8 to 14 - National Dog-Bite Prevention Week. (Second full week of April)

* Sun., April 8 (Sunrise in Pittsburgh: 6:52 a.m. EDT / 10:52 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?

* Sun., April 8, 2:00 a.m. EDT / 6:00 UTC - Moon apogee: 251,123.439115563 statute miles / 404,144 kilometers.

* Sun., April 8, 3:18 a.m. EDT / 7:18 UTC - Primary Moon Phase: Last Quarter.

* April 9 to 13 - National Work Zone Awareness Week. (Early to mid-April)

* April 9 to 13 - National Retirement Planning Week®. (Early to mid-April)

* Mon., 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.

* Tue., 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.

* Tue., April 10 - Equal Pay Day - This date symbolizes how far into the year women must work to earn what men earned in the previous year. (Early to mid-April)

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

* Tue., April 10 - National Library Workers Day. (Tuesday of National Library Week)

* Wed., April 11 - National Bookmobile Day. (Wednesday of National Library Week)

* Thur., 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)

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

* Thur., 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.

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

* Thur., 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.

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

* Thur., April 12 - Teen Literature Day. (Thursday of National Library Week)

* Thur., April 12, 7:53 p.m. EDT / 23:53 UTC - Apparent very close approach of the Moon to Neptune.

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

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

* Fri., April 13 (1970), 10:07:53 p.m. EST / April 14, 3:07:53 UTC (Note: In 1970, Daylight Saving Time did not begin until April 26) - 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.

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

* Fri., April 14 (1970), 7:21 p.m. EST / April 15, 0:21 UTC (Note: In 1970, Daylight Saving Time did not begin until April 26) - 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)

* Sat., 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?

* Sat., April 14 - March for Science including marches in Washington and Pittsburgh.

* Sat., April 14, 5:00 a.m. EDT / 9:00 UTC - Mercury 4 degrees north of the Moon (apparent close approach of the Moon at 7:59 a.m. EDT / 11:59 UTC).

* April 15 to 21 - International Dark-Sky Week. (Week of the New Moon in April)

* April 15 to 22 - International Astronomy Week. (Begins on the Monday preceding the Saturday designated as Astronomy Day)

* April 15 to 21 - National Volunteer Week. (Mid-April)

* April 15 to 21 - National Minority Cancer Awareness Week. (Third week of April)

* Sun., April 15 - Good Deeds Day. (Sunday in late March or early to mid-April)

* Sun., 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)

* Sun., April 15, 9:57 p.m. EDT / April 16, 1:57 UTC - Primary Moon Phase: New Moon - Lunation # 1179.

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

* April 16 to 20 - The Week of the Young Child™. (Mid-April)

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

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

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

* Mon., April 16 - Patriots' Day. (Third Monday of April)

* Tue., April 17 - Tax Day (USA) - Individual Federal tax returns due or postmarked by end of day. (April 15, unless delayed by a holiday)

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

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

* Tue., April 17 - Saturn at aphelion.

* Tue., April 17, 3:00 p.m. EDT / 19:00 UTC - Venus 5 degrees north of the Moon.

* Wed., April 18, 10:00 a.m. EDT / 14:00 UTC - Uranus in conjunction with the Sun (Uranus not visible, even with a telescope).

* Thur., April 19, 1:00 a.m. EDT / 5:00 UTC - Star Aldebaran 1.1 degrees south of the Moon; occultation: northern portions of Canada and Greenland, Scandinavia (northern and eastern sections), Russia (central and northern sections), majority of Kazakhstan and Uzbekistan.

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

* Fri., April 20, 11:00 a.m. EDT / 15:00 UTC - Moon at perigee: 229,108.257774595 statute miles / 368,714 kilometers.

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

* Saturday - April 21, Oct. 13 - 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

* April 21 to 28 - Money Smart Week®. (Last week of April)

* April 21 to 28 - National Infant Immunization Week (NIIW). (Mid-to-late April)

* April 21 to 29 - National Park Week. (Third or fourth week of April, including both weekends)

* Sat., April 21 - National Junior Ranger Day. (Saturday in National Park Week)

* Sat., April 21 - Record Store Day. (Second or third Saturday in April)

* April 22 to 28 - 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 22 to 28 - Preservation Week for library and archive materials. (Last week of April)

* April 22 to 28 - National Infertility Awareness Week®.

* April 22 to 28 - Administrative Professionals Week. (Last full week of April)

* April 22 to 28 - National Re-entry Week. (Last week of April)

* Sun., April 22 - Earth Day. (April 22)

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

* Sun., April 22, 2:00 p.m. EDT / 18:00 UTC (Best viewing: Midnight to Dawn) - Peak of Lyrid Meteor Shower. (April 22)

* Sun., April 22, 5:46 p.m. EDT / 21:46 UTC - Primary Moon Phase: First Quarter.

* April 23 to 27 - Severe Weather Awareness Week. (Pennsylvania: Mid-April)

* April 23 to 29 - National Environmental Education Week. (EE Week - Week near Earth Day: April 22)

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

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

* Mon., April 23, 5:46 p.m. EDT / 21:46 UTC - Mercury at aphelion.

* Mon., April 23, 3:00 p.m. EDT / 7:00 UTC - Moon 1.9 degrees south of Beehive Open Star Cluster (M44).

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

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

* Tue., April 24, 4:00 p.m. EDT / 20:00 UTC - Star Regulus 1.2 degree south of the Moon; occultation: central portion of Russia, northeastern tip of Kazakhstan.

* Wed., 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)

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

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

* Wed., April 25 - Administrative Professionals Day. (Wednesday of Administrative Professionals' Week, last full week of April)

* Thur., 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)

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

* Thur., April 26 - National Take Our Daughters and Sons To Work Day. (Fourth Thursday of April)

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

* Thur., April 26, 1:50 a.m. EDT / 5:50 UTC - Apparent very close approach of Mars and Dwarf Planet Pluto.

* Fri., April 27 - Arbor Day - National Arbor Day Foundation. (Last Friday of April)

* Fri., April 27 - Teach Children to Save Day. (Last Friday of April)

* 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)

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

* Sat., April 28 - Save the Frogs Day. (Last Saturday in April)
Also see news article.

* Sat., April 28, 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)

* April 29 to May 5 - National Small Business Week. (End of April, beginning of May)

* Sun., April 29, 8:58 p.m. EDT / April 30, 0:58 UTC - Primary Moon Phase: Full Moon. (Pink Moon)

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

* Mon., April 30, 1:00 p.m. EDT / 17:00 UTC - Jupiter 4 degrees south of the Moon (apparent close approach of the Moon at 3:17 p.m. EDT / 19:17 UTC).

* Tue., 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.

* Sat., May 5, 9:13 a.m. EDT / 13:13 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. 2018

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/2018.html >
SpaceWatchtower Blog
2018 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 2018, Glenn A. Walsh, All Rights Reserved.
Contact Web Site Administrator: < astrocalendar@planetarium.cc >.

This Internet World Wide Web page created on 2017 Dec. 31.
Last modified : Thursday, 12-Apr-2018 09:17:40 EDT.

You are visitor number , to this web page, since 2017 Dec. 31.