Astronomical Calendar - A.D. 2021

Dominical Letter: "C" - Used in a Perpetual Calendar. For Non-Leap Year of 2021.


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: < https://buhlplanetarium4.tripod.com/astrocalendar/2021.html >
SpaceWatchtower Blog
2021 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. 2021

January ** February ** March

April ** May ** June

July ** August ** September

October ** November ** December


2021

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:
2021 * Today
Archive

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

Solar System *** Archive

Occultations:

Moon / Bright Stars
Moon / Bright Planet & Asteroid
Moon / Planets & Bright Stars
Major Planets & Moons
Archive

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.

2021 Equinoxes (EQX), Solstices (SOLC), and Cross-Quarter (XQ) Days - Archive

* Tue., 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) .

* Wed., Feb. 3, 9:40 a.m. EST / 14:40 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.

* Sat., March 20, 5:37 a.m. EDT / 9:37 UTC - Vernal Equinox - Season of Spring begins in Earth's Northern Hemisphere: beginning of New Year (solar calendar) in Afghanistan and Iran. (~March 20)

* Sat., 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).

* Wed., May 5, 2:36 p.m. EDT / 6:36 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.

* Sun., June 20, 11:32 p.m. EDT / June 21, 3:32 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.

* Sun., 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).

* Sat., Aug. 7, 2:53 a.m. EDT / 6:53 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.

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

* Wed., Sept. 22, 3:21 p.m. EDT / 19:21 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. 6, 11:50 p.m. EST / Nov. 7, 3:50 UTC - Actual Astronomical Cross-Quarter Day (fourth and last actual cross-quarter day of the year: ~Nov. 6-7).
Traditional Cross-Quarter Day.

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

* Tue., Dec. 21, 10:59 a.m. EST / 15:59 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.) 2021 or 2021 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: "C" - Used in a Perpetual Calendar. For Non-Leap Year of 2021.
Epact: 16.
Golden Number (Lunar Cycle): VIII.
Roman Indiction: 14.
Solar Cycle (28-year cycle of the Julian calendar): 14.
Julian Period (Year of): 6734.

Byzantine Year 7530 Begins Sept. 14.
Jewish Year (A.M.) 5782 Begins at local Sunset, Sept. 7.
Chinese / Asian Lunar New Year (Lunar Calendar) - Year of the Ox 4719 Begins Feb. 12.
Roman A.U.C. (Dates from the founding of the City of Rome) Year 2774 Begins Jan. 14.
Nabonassar Year 2770 Begins April 23.
Japanese (Reiwa) Year 3 - Begins May 1.
Grecian Year (Selucidae) 2333 Begins Sept. 14 (or Oct. 14).
Indian Year (Saka) 1943 Begins March 22.
Diocletian Era (Era of the Martyrs) Year 1738 Begins Sept. 11.
Islamic (Hegira) (FCNA date) Year 1443 Begins at first viewing of lunar crescent (New Moon) on evening (after local Sunset) of Aug. 9.
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. 2021

Astronomical Calendar: 2021 January
Monthly Observances This Month

Quadrantid Meteor Shower: Jan. 3 to 4

Moon Phases:
2021 * Today

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

Occultations:
Moon / Bright Stars
Moon / Bright Planet & Asteroid
Moon / Planets & Bright Stars
Major Planets & Moons

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 Letter: "C" - Used in a Perpetual Calendar. For Non-Leap Year of 2021.

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)

* Thur., 2020 Dec. 31 - Make Up Your Mind Day. (Dec. 31)

* Thur., 2020 Dec. 31 - Eve of New Year's Day (Traditional). (Dec. 31)

* Thur., Dec. 31 (2017), 11:59:59 p.m. EST / 2018 Jan. 1, 4:59:59 UTC - Anniversary: Suspension of broadcasting, and conclusion of all-news radio programming after 42 years (having started all-news programming on 1975 Oct. 15), by KQV-AM 1410, Pittsburgh (one of the nation's oldest radio stations, having started on 1919 November 19): Link 1 *** Link 2 (Dec. 31)

* Thur., 2020 Dec. 31, 7:00:00 p.m. EST / 2021 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)

* Fri., 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)

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

* Fri., 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)

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

* Fri., Jan. 1 - Public Domain Day (Annual) - Copyrighted works from 95 years ago are now copyright-free.
Also see: NPR News Story. (Jan. 1)

* Fri., Jan. 1 (1927) - Anniversary: Establishment of the nation's second radio network, the NBC Blue Network, which focused on news and public affairs programming. Due to a Federal Communications Commission (FCC) rule-making in 1942, NBC was forced to divest the NBC Blue Network, which became the ABC Radio Network. ABC Radio continued the news emphasis; ABC Radio was the first network to report the shooting of U.S. President John F. Kennedy on 1963 November 22 (6 minutes and 50 seconds after the shooting). (Jan. 1)

* Fri., 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)

* Sat., Jan. 2, 9:00 a.m. EST / 14:00 UTC - Earth at perihelion (closest Earth approach to the Sun in New Year): 91,399,453 statute miles / 147,093,162 kilometers. (Jan. 2 to 5)

* Jan. 3 Evening to Jan. 4 Morning - Sun., Jan. 3, 10:00 a.m. EST / 15:00 UTC - (Best viewing: Midnight to Dawn) - Peak of Quadrantid Meteor Shower. (Jan. 3 to 4)

* Jan. 4 to 13, 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.

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

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

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

* Wed., 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)

* Wed., Jan. 6 - Orthodox Christmas Eve - As determined by Julian Calendar. (Jan. 6)

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

* Wed., Jan. 6, 4:37 a.m. EST / 9:37 UTC - Primary Moon Phase: Last Quarter.

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

* Fri., 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)

* Fri., 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)

* Sat., Jan. 9 - Library Card Registration Day. (2nd Saturday in January)

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

* Sat., Jan. 9, 11:00 a.m. EST / 16:00 UTC - Moon at perigee: 228,283.7 statute miles / 367,387 kilometers.

* Sat., Jan. 9, 4:00 p.m. EST / 21:00 UTC - Mercury 1.7 degrees south of Saturn.

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

* Sun., Jan. 10, 7:00 a.m. EST / 12:00 UTC - 2.3-DEGREE CIRCLE OF PLANETS LOW IN WESTERN SKY SHORTLY AFTER SUNSET: JUPITER, SATURN, MERCURY.

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

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

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

* Mon., Jan. 11 - National Clean Off Your Desk Day. (2nd Monday of January)

* Mon., Jan. 11, 6:00 a.m. EST / 11:00 UTC - Mercury 1.5 degrees south of Jupiter.

* Mon., Jan. 11, 3:00 p.m. EST / 20:00 UTC - Venus 1.5 degrees north of the Moon.

* Tue.,Jan. 12 (1958) - Establishment of the Special Committee on Space Technology of the National Advisory Committee for Aeronautics (NACA: established 1915 March 3), the predecessor of the National Aeronautics and Space Administration (NASA). (Jan. 12)

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

* Wed., Jan. 13, 12:00 Midnight EST / 5:00 UTC - Primary Moon Phase: New Moon - Lunation #1213

* Wed., Jan. 13, 8:00 p.m. EST / Jan. 14, 1:00 UTC - Jupiter 3 degrees north of the Moon.

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

* Thur., Jan. 14, 3:00 a.m. EST / 8:00 UTC - Mercury 2 degrees north of the Moon.

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

* Fri., Jan. 15 (2001) - Anniversary: Launch of Wikipedia, free-of-charge, on-line encyclopedia. (Jan. 15)

Sat., Jan. 16 (1786) - National Religious Freedom Day - Commemorates Virginia General Assembly's adoption of Thomas Jefferson's landmark Virginia Statute for Religious Freedom. (Jan. 16)

* Sun., 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)

* Mon., Jan. 18 - 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)

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

* Wed., Jan. 20, 4:01 p.m. EST / 21:01 UTC - Primary Moon Phase: First Quarter.

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

* Thur., Jan. 21, 1:00 a.m. EST / 6:00 UTC - Mars 5 degrees north of the Moon.

* Thur., Jan. 21, 1:00 a.m. EST / 6:00 UTC - Uranus 3 degrees north of the Moon.

* Thur., Jan. 21, 8:00 a.m. EST / 13:00 UTC - Moon at apogee: 251,257.7 statute miles / 404,360 kilometers.

* Thur., Jan. 21, 7:00 p.m. EST / Jan. 22, 0:00 UTC - Mars 1.7 degrees north of Uranus.
ALSO: Mars, Uranus, and the Waxing Gibbous Moon congregate together, in the southwestern sky shortly after local sunset (Uranus will be very dim; binoculars or telescope may be necessary.)

* Sat., 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)

* Sat., Jan. 23, 10:00 p.m. EST / Jan. 24, 3:00 UTC - Saturn in conjunction with the Sun (Saturn not visible, even with a telescope).

* Jan. 24 to 30 - Celebrate Catholic Schools Week. (End of January / Beginning of February)

* Jan. 24 to 30 - Tax Identity Theft Awareness Week. (Last business week of January / first business week of February).

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

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

* Mon., Jan. 25, 6:00 p.m. EST / 23:00 UTC - Moon 0.3 degree north of Open Star Cluster M35

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

* Wed., Jan. 27 (1967) - Anniversary: Apollo 1 Fire - Three astronauts perished in flash-fire during pre-launch test: Gus Grissom, Ed White, Roger Chaffee. (Jan. 27)

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

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

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

* Thur., Jan. 28 (1986) - Anniversary: STS Space Shuttle Challenger (Teacher-in-Space Mission) explosion shortly after launch; 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).

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

* Thur., Jan. 28, 2:16 p.m. EST / 19:16 UTC - Primary Moon Phase: Full Moon - Wolf Moon.

* Thur., Jan. 28, 9:00 p.m. EST / Jan. 29, 2:00 UTC - Jupiter in conjunction with the Sun (Jupiter not visible, even with a telescope).

* Fri., Jan. 29 - Earned Income Tax Credit (EITC) Awareness Day. (Last Friday in January)

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

* Fri., Jan. 29 - Mercury at perihelion.

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

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

Astronomical Calendar - A.D. 2021

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: < https://buhlplanetarium4.tripod.com/astrocalendar/2021.html >
SpaceWatchtower Blog
2021 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 2021, Glenn A. Walsh, All Rights Reserved.
Contact Web Site Administrator: < astrocalendar@planetarium.cc >.

This Internet World Wide Web page created on Sunday, 2021 Jan. 3.
Last modified : Monday, 04-Jan-2021 12:46:09 EST.

You are visitor number , to this web page, since Sunday, 2021 Jan. 3.