2021 Calendar of Astronomical Events




    


2021 Phases of the Moon

Atlantic Standard Time

The following table gives the date and time of the Moon's phases for the year. If Daylight Saving Time is in effect, add one hour to the times listed.

2021 Phases of the Moon
Atlantic Standard Time
New Moon First Quarter Full Moon Last Quarter
--- Jan 6 05:37
Jan 13 01:00 Jan 20 17:02 Jan 28 15:16 Feb 4 13:37
Feb 11 15:06 Feb 19 14:47 Feb 27 04:17 Mar 5 21:30
Mar 13 06:21 Mar 21 10:40 Mar 28 14:48 Apr 4 06:02
Apr 11 22:31 Apr 20 02:59 Apr 26 23:31 May 3 15:50
May 11 15:00 May 19 15:13 May 26 07:14 t Jun 2 03:24
Jun 10 06:53 A Jun 17 23:54 Jun 24 14:40 Jul 1 17:11
Jul 9 21:17 Jul 17 06:11 Jul 23 22:37 Jul 31 09:16
Aug 8 09:50 Aug 15 11:20 Aug 22 08:02 Aug 30 03:13
Sep 6 20:52 Sep 13 16:39 Sep 20 19:55 Sep 28 21:57
Oct 6 07:05 Oct 12 23:25 Oct 20 10:57 Oct 28 16:05
Nov 4 17:15 Nov 11 08:46 Nov 19 04:58 p Nov 27 08:28
Dec 4 03:43 T Dec 10 21:36 Dec 19 00:36 Dec 26 22:24

An eclipse of the Sun can only occur at New Moon (see: Solar Eclipses for Beginners), while an eclipse of the Moon can only occur at Full Moon (see: Lunar Eclipses for Beginners). In any calendar year there are a minimum of two solar and two lunar eclipses.

If an eclipse of the Sun or Moon takes place on a given date, it is noted by a character next to the date in the table above. Solar eclipses are indicated as: T=Total, A=Annular, H=Hybrid and P=Partial. Lunar eclipses are indicated as: t=Total, p=Partial, and n=Penumbral.

Phases of the Moon Photo Gallery is an image collection showing the Moon's phases over a complete synodic month.



2021 Calendar of Astronomical Events

Atlantic Standard Time

The following table gives the date and time of the important astronomical events for the year. If Daylight Saving Time is in effect, add one hour to the times listed. A key to astronomical terms appears below the calendar.

2021 Calendar of Astronomical Events
January - June July - December
Date     AST   Event
        (h:m)

Jan 01  03:05  Beehive 2.3°S of Moon
    02  10     Earth at Perihelion: 0.98325 AU
    02  17:58  Regulus 4.7°S of Moon
    03  11     Quadrantid Meteor Shower
    06  05:37  LAST QUARTER MOON 
    09  11:39  Moon at Perigee: 367390 km
    09  22:08  Antares 5.6°S of Moon
    10  01     Mercury 1.6° of Saturn
    10  16:14  Moon at Descending Node 
    11  14     Mercury 1.4° of Jupiter
    11  16:12  Venus 1.5°N of Moon
    13  01:00  NEW MOON 
    14  04:15  Mercury 2.3°N of Moon
    20  17:02  FIRST QUARTER MOON 
    21  01:37  Mars 5.1°N of Moon
    21  09:11  Moon at Apogee: 404361 km
    23  22     Mercury at Greatest Elong: 18.6°E
    23  22     Saturn in Conjunction with Sun 
    24  00:39  Aldebaran 4.7°S of Moon
    24  17:47  Moon at Ascending Node 
    27  11:46  Pollux 3.8°N of Moon
    28  10:50  Beehive 2.3°S of Moon
    28  15:16  FULL MOON 
    28  21     Jupiter in Conjunction with Sun 
    28  22     Mercury at Perihelion 
    30  00:56  Regulus 4.6°S of Moon

Feb 03  15:33  Moon at Perigee: 370127 km
    04  13:37  LAST QUARTER MOON 
    06  04:33  Antares 5.5°S of Moon
    06  20:29  Moon at Descending Node 
    08  10     Mercury at Inferior Conjunction 
    11  15:06  NEW MOON 
    15  10     Mercury 3.8° of Jupiter
    18  06:22  Moon at Apogee: 404467 km
    18  18:47  Mars 3.7°N of Moon
    19  14:47  FIRST QUARTER MOON 
    20  01     Venus at Aphelion 
    20  09:15  Aldebaran 5.0°S of Moon
    20  21:44  Moon at Ascending Node 
    23  04     Mercury 4.0° of Saturn
    23  21:10  Pollux 3.7°N of Moon
    24  20:16  Beehive 2.4°S of Moon
    26  10:04  Regulus 4.6°S of Moon
    27  04:17  FULL MOON 

Mar 02  01:19  Moon at Perigee: 365422 km
    03  19:36  Mars 2.6°S of Pleiades
    05  01     Mercury 0.3° of Jupiter
    05  09:58  Antares 5.2°S of Moon
    05  20:56  Moon at Descending Node 
    05  21:30  LAST QUARTER MOON 
    06  07     Mercury at Greatest Elong: 27.3°W
    09  19:02  Saturn 3.7°N of Moon
    10  11:35  Jupiter 4.0°N of Moon
    10  20     Neptune in Conjunction with Sun 
    10  21:02  Mercury 3.7°N of Moon
    13  06:21  NEW MOON 
    13  22     Mercury at Aphelion 
    18  01:04  Moon at Apogee: 405253 km
    19  13:48  Mars 1.9°N of Moon
    19  17:13  Aldebaran 5.2°S of Moon
    19  23:31  Moon at Ascending Node 
    20  05:37  Vernal Equinox 
    20  15:15  Mars 6.9°N of Aldebaran
    21  10:40  FIRST QUARTER MOON 
    23  06:26  Pollux 3.5°N of Moon
    24  05:58  Beehive 2.6°S of Moon
    25  20:17  Regulus 4.7°S of Moon
    26  02     Venus at Superior Conjunction 
    28  14:48  FULL MOON 
    29  11:52  Spica 6.5°S of Moon
    30  02:12  Moon at Perigee: 360311 km

Apr 01  16:49  Antares 4.9°S of Moon
    01  22:41  Moon at Descending Node 
    04  06:02  LAST QUARTER MOON 
    06  04:34  Saturn 4.0°N of Moon
    07  03:15  Jupiter 4.4°N of Moon
    11  22:31  NEW MOON 
    14  13:47  Moon at Apogee: 406120 km
    16  00:07  Aldebaran 5.4°S of Moon
    16  01:53  Moon at Ascending Node 
    17  08:09  Mars 0.1°N of Moon: Occn.
    18  22     Mercury at Superior Conjunction 
    19  14:18  Pollux 3.2°N of Moon
    20  02:59  FIRST QUARTER MOON 
    20  14:25  Beehive 2.8°S of Moon
    22  05:48  Regulus 4.9°S of Moon
    22  08     Lyrid Meteor Shower
    25  22:43  Spica 6.5°S of Moon
    26  21     Mercury at Perihelion 
    26  23:31  FULL MOON 
    27  11:24  Moon at Perigee: 357379 km
    29  02:07  Antares 4.8°S of Moon
    29  05:17  Moon at Descending Node 
    30  17     Uranus in Conjunction with Sun 

May 03  13:02  Saturn 4.2°N of Moon
    03  15:50  LAST QUARTER MOON 
    03  23:03  Mercury 2.1°S of Pleiades
    04  17:00  Jupiter 4.6°N of Moon
    04  21     Eta-Aquarid Meteor Shower
    11  15:00  NEW MOON 
    11  17:54  Moon at Apogee: 406512 km
    13  06:29  Moon at Ascending Node 
    13  13:59  Mercury 2.1°N of Moon
    16  00:47  Mars 1.5°S of Moon
    16  20:39  Pollux 3.1°N of Moon
    17  02     Mercury at Greatest Elong: 22.0°E
    17  21:08  Beehive 2.9°S of Moon
    19  13:28  Regulus 5.0°S of Moon
    19  15:13  FIRST QUARTER MOON 
    23  09:07  Spica 6.5°S of Moon
    25  21:52  Moon at Perigee: 357310 km
    26  07:14  FULL MOON 
    26  07:19  Total Lunar Eclipse; mag=1.009
    26  12:55  Antares 4.8°S of Moon
    26  15:38  Moon at Descending Node 
    28  23     Mercury 0.4° of Venus
    30  21:22  Saturn 4.2°N of Moon
    31  07:41  Mars 5.2°S of Pollux

Jun 01  04:57  Jupiter 4.6°N of Moon
    02  03:24  LAST QUARTER MOON 
    07  22:27  Moon at Apogee: 406230 km
    09  12:42  Moon at Ascending Node 
    10  06:42  Annular Solar Eclipse; mag=0.943
    10  06:53  NEW MOON 
    10  21     Mercury at Inferior Conjunction 
    12  02:44  Venus 1.5°S of Moon
    12  09     Venus at Perihelion 
    13  02:19  Pollux 3.1°N of Moon
    13  15:52  Mars 2.8°S of Moon
    14  02:47  Beehive 2.9°S of Moon
    15  19:28  Regulus 5.0°S of Moon
    17  23:54  FIRST QUARTER MOON 
    20  23:32  Summer Solstice 
    21  11:57  Venus 5.1°S of Pollux
    22  16:36  Mercury 1.8°N of Aldebaran
    22  23:26  Antares 4.8°S of Moon
    23  01:21  Mars 0.3°S of Beehive
    23  02:07  Moon at Descending Node 
    23  05:58  Moon at Perigee: 359960 km
    24  14:40  FULL MOON 
    27  05:30  Saturn 4.0°N of Moon
    28  14:38  Jupiter 4.5°N of Moon

Date     AST   Event
        (h:m)

Jul 01  17:11  LAST QUARTER MOON 
    02  22:45  Venus 0.1°N of Beehive
    04  16     Mercury at Greatest Elong: 21.6°W
    05  10:48  Moon at Apogee: 405342 km
    05  19     Earth at Aphelion: 1.01673 AU
    06  18:41  Moon at Ascending Node 
    06  18:52  Aldebaran 5.5°S of Moon
    08  00:38  Mercury 3.7°S of Moon
    09  21:17  NEW MOON 
    12  05:10  Venus 3.3°S of Moon
    12  06:10  Mars 3.8°S of Moon
    12  20     Mars at Aphelion 
    13  01:02  Regulus 4.9°S of Moon
    17  00:01  Spica 6.4°S of Moon
    17  06:11  FIRST QUARTER MOON 
    20  08:06  Antares 4.7°S of Moon
    20  09:22  Moon at Descending Node 
    21  06:30  Moon at Perigee: 364520 km
    21  17:21  Venus 1.0°N of Regulus
    23  21     Mercury at Perihelion 
    23  22:37  FULL MOON 
    24  12:42  Saturn 3.8°N of Moon
    25  21:17  Jupiter 4.2°N of Moon
    27  23     Delta-Aquarid Meteor Shower
    29  10:09  Mars 0.6°N of Regulus
    31  09:16  LAST QUARTER MOON 

Aug 01  10     Mercury at Superior Conjunction 
    02  01     Saturn at Opposition 
    02  03:35  Moon at Apogee: 404412 km
    02  22:51  Moon at Ascending Node 
    03  02:18  Aldebaran 5.7°S of Moon
    06  15:42  Pollux 3.1°N of Moon
    08  09:50  NEW MOON 
    11  03:00  Venus 4.3°S of Moon
    12  15     Perseid Meteor Shower
    13  05:31  Spica 6.1°S of Moon
    15  11:20  FIRST QUARTER MOON 
    16  12:04  Moon at Descending Node 
    16  14:34  Antares 4.5°S of Moon
    17  05:23  Moon at Perigee: 369127 km
    18  23     Mercury 0.1° of Mars
    19  19     Jupiter at Opposition 
    20  18:19  Saturn 3.7°N of Moon
    22  00:52  Jupiter 4.0°N of Moon
    22  08:02  FULL MOON 
    29  22:22  Moon at Apogee: 404100 km
    30  01:13  Moon at Ascending Node 
    30  03:13  LAST QUARTER MOON 

Sep 03  00:04  Pollux 3.0°N of Moon
    04  00:07  Beehive 2.9°S of Moon
    05  10:32  Venus 1.4°N of Spica
    05  20     Mercury at Aphelion 
    06  20:52  NEW MOON 
    09  12:01  Spica 5.9°S of Moon
    09  22:09  Venus 4.1°S of Moon
    11  06:05  Moon at Perigee: 368464 km
    12  12:35  Moon at Descending Node 
    12  19:59  Antares 4.2°S of Moon
    13  16:39  FIRST QUARTER MOON 
    14  00     Mercury at Greatest Elong: 26.8°E
    14  04     Neptune at Opposition 
    16  22:37  Saturn 3.8°N of Moon
    18  02:50  Jupiter 4.0°N of Moon
    20  19:55  FULL MOON 
    20  22:00  Mercury 1.2°S of Spica
    22  15:21  Autumnal Equinox 
    26  03:33  Moon at Ascending Node 
    26  17:44  Moon at Apogee: 404641 km
    28  21:57  LAST QUARTER MOON 
    30  08:44  Pollux 2.8°N of Moon

Oct 01  09:07  Beehive 3.1°S of Moon
    02  18     Venus at Aphelion 
    03  01:12  Regulus 4.9°S of Moon
    06  07:05  NEW MOON 
    08  00     Mars in Conjunction with Sun 
    08  13:28  Moon at Perigee: 363388 km
    09  12     Mercury at Inferior Conjunction 
    09  14:36  Venus 2.9°S of Moon
    09  15:35  Moon at Descending Node 
    10  02:27  Antares 4.0°S of Moon
    12  23:25  FIRST QUARTER MOON 
    14  03:12  Saturn 3.9°N of Moon
    15  05:58  Jupiter 4.1°N of Moon
    16  09:24  Venus 1.4°N of Antares
    19  20     Mercury at Perihelion 
    20  10:57  FULL MOON 
    21  07     Orionid Meteor Shower
    23  07:47  Moon at Ascending Node 
    24  11:30  Moon at Apogee: 405616 km
    25  01     Mercury at Greatest Elong: 18.4°W
    27  16:40  Pollux 2.6°N of Moon
    28  16:05  LAST QUARTER MOON 
    28  17:32  Beehive 3.3°S of Moon
    29  18     Venus at Greatest Elong: 47.0°E
    30  10:33  Regulus 5.1°S of Moon

Nov 01  21:18  Mercury 3.7°N of Spica
    03  14:40  Mercury 1.2°S of Moon: Occn.
    04  17:15  NEW MOON 
    04  20     Uranus at Opposition 
    05  08     S Taurid Meteor Shower
    05  18:23  Moon at Perigee: 358845 km
    05  23:38  Moon at Descending Node 
    06  11:29  Antares 3.9°S of Moon
    08  01:21  Venus 1.1°S of Moon: Occn.
    10  10:27  Saturn 4.1°N of Moon
    11  08:46  FIRST QUARTER MOON 
    11  13:13  Jupiter 4.4°N of Moon
    12  07     N Taurid Meteor Shower
    17  14     Leonid Meteor Shower
    19  04:58  FULL MOON 
    19  05:03  Partial Lunar Eclipse; mag=0.974
    19  13:59  Moon at Ascending Node 
    20  22:14  Moon at Apogee: 406276 km
    23  23:22  Pollux 2.5°N of Moon
    25  00:32  Beehive 3.3°S of Moon
    26  18:27  Regulus 5.2°S of Moon
    27  08:28  LAST QUARTER MOON 
    29  01     Mercury at Superior Conjunction 
    30  18:04  Spica 5.9°S of Moon

Dec 03  10:58  Moon at Descending Node 
    04  03:33  Total Solar Eclipse; mag=1.037
    04  03:43  NEW MOON 
    04  06:01  Moon at Perigee: 356794 km
    06  20:48  Venus 1.9°N of Moon
    07  21:52  Saturn 4.2°N of Moon
    09  02:07  Jupiter 4.5°N of Moon
    10  21:36  FIRST QUARTER MOON 
    14  03     Geminid Meteor Shower
    16  20:12  Moon at Ascending Node 
    17  22:16  Moon at Apogee: 406322 km
    19  00:36  FULL MOON 
    21  05:20  Pollux 2.6°N of Moon
    21  11:59  Winter Solstice 
    22  06:28  Beehive 3.3°S of Moon
    22  11     Ursid Meteor Shower
    24  00:40  Regulus 5.1°S of Moon
    26  22:24  LAST QUARTER MOON 
    27  05:15  Mars 4.4°N of Antares
    28  02:58  Spica 5.8°S of Moon
    29  01     Mercury 4.2° of Venus
    30  21:07  Moon at Descending Node 
    31  09:54  Antares 3.9°S of Moon
    31  16:13  Mars 1.0°N of Moon: Occn.

    

Astronomical Definitions

  • Perihelion - the instant when a planet is closest to the Sun
  • Aphelion - the instant when a planet is furthest from the Sun
  • Perigee - the instant when the Moon is closest to Earth
  • Apogee - the instant when the Moon is furthest from Earth
  • Inferior Conjunction - the instant when a planet passes between Earth and the Sun (Mercury or Venus)
  • Superior Conjunction - the instant when a planet passes on the opposite side of the Sun from Earth (Mercury or Venus)
  • Greatest Elongation - elongation is the apparent angle between a planet and the Sun as seen from Earth; during eastern elongation (E), the planet appears as an evening star; during western elongation (W), the planet appears as a morning star
  • Opposition - the instant when a planet appears opposite the Sun as seen from Earth
  • Conjunction - the instant when a planet appears closest the Sun as seen from Earth
  • Occultation - the Moon occults or eclipses a star or planet
  • Ascending Node - the point where a planet crosses from the southern to northern portion of its orbit
  • Descending Node - the point where a planet crosses from the northern to the southern portion of its orbit



Calendars for Other Years and Time Zones

The table below contains links to astronomical events calendars for a range of years and Time Zones. Abbreviations for the time zones are: GMT = Greenwich Mean Time, AST = Atlantic Standard Time, EST = Eastern Standard Time, CST = Central Standard Time, MST = Mountain Standard Time, PST = Pacific Standard Time, AKST = Alaskan Standard Time, and HST = Hawaiian Standard Time.

Calendar of Astronomical Events
GMT 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
AST 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
EST 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
CST 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
MST 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
PST 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
AKST 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
HST 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025

For years or time zones not covered above, please visit SKYCAL the astronomical events calendar generator.

Accuracy

The times of astronomical events listed with a precision in hours and minutes (i.e., hh:mm) are accurate to the nearest minute. Similarly, the times of astronomical events listed with a precision in hours (i.e., hh) are accurate to the nearest hour.

A simplified solar ephemeris results an accuracy of ±0.5 hours for the perihelion and aphelion of Earth. The algorithm used in the perihelion and aphelion of the other planets is based on unperturbed elliptical orbits. For Mars, the accuracy is about 2 hours. Due to mutual planetary perturbations, the times for Jupiter may be in error by several weeks, while Saturn's times may be in error by a month. The times for Uranus and Neptune may be in error by several months. In the future, we plan to develop algorithms to improve the computed times of perihelion and aphelion of the planets.

Acknowledgements

All calculations are by Fred Espenak, and he assumes full responsibility for their accuracy. Algorithms used in predicting the phases of the Moon, eclipses and other sky phenomena are based on Astronomical Algorithms by Jean Meeus (Willmann-Bell, Inc., Richmond, 1998).

Permission is freely granted to reproduce this data when accompanied by the acknowledgment:


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