2021 Calendar of Astronomical Events




    


2021 Phases of the Moon

Alaska 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
Alaska Standard Time
New Moon First Quarter Full Moon Last Quarter
--- Jan 6 00:37
Jan 12 20:00 Jan 20 12:02 Jan 28 10:16 Feb 4 08:37
Feb 11 10:06 Feb 19 09:47 Feb 26 23:17 Mar 5 16:30
Mar 13 01:21 Mar 21 05:40 Mar 28 09:48 Apr 4 01:02
Apr 11 17:31 Apr 19 21:59 Apr 26 18:31 May 3 10:50
May 11 10:00 May 19 10:13 May 26 02:14 t Jun 1 22:24
Jun 10 01:53 A Jun 17 18:54 Jun 24 09:40 Jul 1 12:11
Jul 9 16:17 Jul 17 01:11 Jul 23 17:37 Jul 31 04:16
Aug 8 04:50 Aug 15 06:20 Aug 22 03:02 Aug 29 22:13
Sep 6 15:52 Sep 13 11:39 Sep 20 14:55 Sep 28 16:57
Oct 6 02:05 Oct 12 18:25 Oct 20 05:57 Oct 28 11:05
Nov 4 12:15 Nov 11 03:46 Nov 18 23:58 p Nov 27 03:28
Dec 3 22:43 T Dec 10 16:36 Dec 18 19:36 Dec 26 17:24

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

Alaska 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     AKST   Even
        (h:m)

Jan 02  05     Earth at Perihelion: 0.98325 AU
    02  12:58  Regulus 4.7°S of Moon
    03  06     Quadrantid Meteor Shower
    06  00:37  LAST QUARTER MOON 
    09  06:39  Moon at Perigee: 367390 km
    09  17:08  Antares 5.6°S of Moon
    09  20     Mercury 1.6° of Saturn
    10  11:14  Moon at Descending Node 
    11  09     Mercury 1.4° of Jupiter
    11  11:12  Venus 1.5°N of Moon
    12  20:00  NEW MOON 
    13  23:15  Mercury 2.3°N of Moon
    20  12:02  FIRST QUARTER MOON 
    20  20:37  Mars 5.1°N of Moon
    21  04:11  Moon at Apogee: 404361 km
    23  17     Mercury at Greatest Elong: 18.6°E
    23  17     Saturn in Conjunction with Sun 
    23  19:39  Aldebaran 4.7°S of Moon
    24  12:47  Moon at Ascending Node 
    27  06:46  Pollux 3.8°N of Moon
    28  05:50  Beehive 2.3°S of Moon
    28  10:16  FULL MOON 
    28  16     Jupiter in Conjunction with Sun 
    28  17     Mercury at Perihelion 
    29  19:56  Regulus 4.6°S of Moon

Feb 03  10:33  Moon at Perigee: 370127 km
    04  08:37  LAST QUARTER MOON 
    05  23:33  Antares 5.5°S of Moon
    06  15:29  Moon at Descending Node 
    08  05     Mercury at Inferior Conjunction 
    11  10:06  NEW MOON 
    15  05     Mercury 3.8° of Jupiter
    18  01:22  Moon at Apogee: 404467 km
    18  13:47  Mars 3.7°N of Moon
    19  09:47  FIRST QUARTER MOON 
    19  20     Venus at Aphelion 
    20  04:15  Aldebaran 5.0°S of Moon
    20  16:44  Moon at Ascending Node 
    22  23     Mercury 4.0° of Saturn
    23  16:10  Pollux 3.7°N of Moon
    24  15:16  Beehive 2.4°S of Moon
    26  05:04  Regulus 4.6°S of Moon
    26  23:17  FULL MOON 

Mar 01  20:19  Moon at Perigee: 365422 km
    03  14:36  Mars 2.6°S of Pleiades
    04  20     Mercury 0.3° of Jupiter
    05  04:58  Antares 5.2°S of Moon
    05  15:56  Moon at Descending Node 
    05  16:30  LAST QUARTER MOON 
    06  02     Mercury at Greatest Elong: 27.3°W
    09  14:02  Saturn 3.7°N of Moon
    10  06:35  Jupiter 4.0°N of Moon
    10  15     Neptune in Conjunction with Sun 
    10  16:02  Mercury 3.7°N of Moon
    13  01:21  NEW MOON 
    13  17     Mercury at Aphelion 
    17  20:04  Moon at Apogee: 405253 km
    19  08:48  Mars 1.9°N of Moon
    19  12:13  Aldebaran 5.2°S of Moon
    19  18:31  Moon at Ascending Node 
    20  00:37  Vernal Equinox 
    20  10:15  Mars 6.9°N of Aldebaran
    21  05:40  FIRST QUARTER MOON 
    23  01:26  Pollux 3.5°N of Moon
    24  00:58  Beehive 2.6°S of Moon
    25  15:17  Regulus 4.7°S of Moon
    25  21     Venus at Superior Conjunction 
    28  09:48  FULL MOON 
    29  06:52  Spica 6.5°S of Moon
    29  21:12  Moon at Perigee: 360311 km

Apr 01  11:49  Antares 4.9°S of Moon
    01  17:41  Moon at Descending Node 
    04  01:02  LAST QUARTER MOON 
    05  23:34  Saturn 4.0°N of Moon
    06  22:15  Jupiter 4.4°N of Moon
    11  17:31  NEW MOON 
    14  08:47  Moon at Apogee: 406120 km
    15  19:07  Aldebaran 5.4°S of Moon
    15  20:53  Moon at Ascending Node 
    17  03:09  Mars 0.1°N of Moon: Occn.
    18  17     Mercury at Superior Conjunction 
    19  09:18  Pollux 3.2°N of Moon
    19  21:59  FIRST QUARTER MOON 
    20  09:25  Beehive 2.8°S of Moon
    22  00:48  Regulus 4.9°S of Moon
    22  03     Lyrid Meteor Shower
    25  17:43  Spica 6.5°S of Moon
    26  16     Mercury at Perihelion 
    26  18:31  FULL MOON 
    27  06:24  Moon at Perigee: 357379 km
    28  21:07  Antares 4.8°S of Moon
    29  00:17  Moon at Descending Node 
    30  12     Uranus in Conjunction with Sun 

May 03  08:02  Saturn 4.2°N of Moon
    03  10:50  LAST QUARTER MOON 
    03  18:03  Mercury 2.1°S of Pleiades
    04  12:00  Jupiter 4.6°N of Moon
    04  16     Eta-Aquarid Meteor Shower
    11  10:00  NEW MOON 
    11  12:54  Moon at Apogee: 406512 km
    13  01:29  Moon at Ascending Node 
    13  08:59  Mercury 2.1°N of Moon
    15  19:47  Mars 1.5°S of Moon
    16  15:39  Pollux 3.1°N of Moon
    16  21     Mercury at Greatest Elong: 22.0°E
    17  16:08  Beehive 2.9°S of Moon
    19  08:28  Regulus 5.0°S of Moon
    19  10:13  FIRST QUARTER MOON 
    23  04:07  Spica 6.5°S of Moon
    25  16:52  Moon at Perigee: 357310 km
    26  02:14  FULL MOON 
    26  02:19  Total Lunar Eclipse; mag=1.009
    26  07:55  Antares 4.8°S of Moon
    26  10:38  Moon at Descending Node 
    28  18     Mercury 0.4° of Venus
    30  16:22  Saturn 4.2°N of Moon
    31  02:41  Mars 5.2°S of Pollux
    31  23:57  Jupiter 4.6°N of Moon

Jun 01  22:24  LAST QUARTER MOON 
    07  17:27  Moon at Apogee: 406230 km
    09  07:42  Moon at Ascending Node 
    10  01:42  Annular Solar Eclipse; mag=0.943
    10  01:53  NEW MOON 
    10  16     Mercury at Inferior Conjunction 
    11  21:44  Venus 1.5°S of Moon
    12  04     Venus at Perihelion 
    12  21:19  Pollux 3.1°N of Moon
    13  10:52  Mars 2.8°S of Moon
    13  21:47  Beehive 2.9°S of Moon
    15  14:28  Regulus 5.0°S of Moon
    17  18:54  FIRST QUARTER MOON 
    20  18:32  Summer Solstice 
    21  06:57  Venus 5.1°S of Pollux
    22  11:36  Mercury 1.8°N of Aldebaran
    22  18:26  Antares 4.8°S of Moon
    22  20:21  Mars 0.3°S of Beehive
    22  21:07  Moon at Descending Node 
    23  00:58  Moon at Perigee: 359960 km
    24  09:40  FULL MOON 
    27  00:30  Saturn 4.0°N of Moon
    28  09:38  Jupiter 4.5°N of Moon

Date     AKST   Even
        (h:m)

Jul 01  12:11  LAST QUARTER MOON 
    02  17:45  Venus 0.1°N of Beehive
    04  11     Mercury at Greatest Elong: 21.6°W
    05  05:48  Moon at Apogee: 405342 km
    05  14     Earth at Aphelion: 1.01673 AU
    06  13:41  Moon at Ascending Node 
    06  13:52  Aldebaran 5.5°S of Moon
    07  19:38  Mercury 3.7°S of Moon
    09  16:17  NEW MOON 
    12  00:10  Venus 3.3°S of Moon
    12  01:10  Mars 3.8°S of Moon
    12  15     Mars at Aphelion 
    12  20:02  Regulus 4.9°S of Moon
    16  19:01  Spica 6.4°S of Moon
    17  01:11  FIRST QUARTER MOON 
    20  03:06  Antares 4.7°S of Moon
    20  04:22  Moon at Descending Node 
    21  01:30  Moon at Perigee: 364520 km
    21  12:21  Venus 1.0°N of Regulus
    23  16     Mercury at Perihelion 
    23  17:37  FULL MOON 
    24  07:42  Saturn 3.8°N of Moon
    25  16:17  Jupiter 4.2°N of Moon
    27  18     Delta-Aquarid Meteor Shower
    29  05:09  Mars 0.6°N of Regulus
    31  04:16  LAST QUARTER MOON 

Aug 01  05     Mercury at Superior Conjunction 
    01  20     Saturn at Opposition 
    01  22:35  Moon at Apogee: 404412 km
    02  17:51  Moon at Ascending Node 
    02  21:18  Aldebaran 5.7°S of Moon
    06  10:42  Pollux 3.1°N of Moon
    08  04:50  NEW MOON 
    10  22:00  Venus 4.3°S of Moon
    12  10     Perseid Meteor Shower
    13  00:31  Spica 6.1°S of Moon
    15  06:20  FIRST QUARTER MOON 
    16  07:04  Moon at Descending Node 
    16  09:34  Antares 4.5°S of Moon
    17  00:23  Moon at Perigee: 369127 km
    18  18     Mercury 0.1° of Mars
    19  14     Jupiter at Opposition 
    20  13:19  Saturn 3.7°N of Moon
    21  19:52  Jupiter 4.0°N of Moon
    22  03:02  FULL MOON 
    29  17:22  Moon at Apogee: 404100 km
    29  20:13  Moon at Ascending Node 
    29  22:13  LAST QUARTER MOON 

Sep 02  19:04  Pollux 3.0°N of Moon
    03  19:07  Beehive 2.9°S of Moon
    05  05:32  Venus 1.4°N of Spica
    05  15     Mercury at Aphelion 
    06  15:52  NEW MOON 
    09  07:01  Spica 5.9°S of Moon
    09  17:09  Venus 4.1°S of Moon
    11  01:05  Moon at Perigee: 368464 km
    12  07:35  Moon at Descending Node 
    12  14:59  Antares 4.2°S of Moon
    13  11:39  FIRST QUARTER MOON 
    13  19     Mercury at Greatest Elong: 26.8°E
    13  23     Neptune at Opposition 
    16  17:37  Saturn 3.8°N of Moon
    17  21:50  Jupiter 4.0°N of Moon
    20  14:55  FULL MOON 
    20  17:00  Mercury 1.2°S of Spica
    22  10:21  Autumnal Equinox 
    25  22:33  Moon at Ascending Node 
    26  12:44  Moon at Apogee: 404641 km
    28  16:57  LAST QUARTER MOON 
    30  03:44  Pollux 2.8°N of Moon

Oct 01  04:07  Beehive 3.1°S of Moon
    02  13     Venus at Aphelion 
    02  20:12  Regulus 4.9°S of Moon
    06  02:05  NEW MOON 
    07  19     Mars in Conjunction with Sun 
    08  08:28  Moon at Perigee: 363388 km
    09  07     Mercury at Inferior Conjunction 
    09  09:36  Venus 2.9°S of Moon
    09  10:35  Moon at Descending Node 
    09  21:27  Antares 4.0°S of Moon
    12  18:25  FIRST QUARTER MOON 
    13  22:12  Saturn 3.9°N of Moon
    15  00:58  Jupiter 4.1°N of Moon
    16  04:24  Venus 1.4°N of Antares
    19  15     Mercury at Perihelion 
    20  05:57  FULL MOON 
    21  02     Orionid Meteor Shower
    23  02:47  Moon at Ascending Node 
    24  06:30  Moon at Apogee: 405616 km
    24  20     Mercury at Greatest Elong: 18.4°W
    27  11:40  Pollux 2.6°N of Moon
    28  11:05  LAST QUARTER MOON 
    28  12:32  Beehive 3.3°S of Moon
    29  13     Venus at Greatest Elong: 47.0°E
    30  05:33  Regulus 5.1°S of Moon

Nov 01  16:18  Mercury 3.7°N of Spica
    03  09:40  Mercury 1.2°S of Moon: Occn.
    04  12:15  NEW MOON 
    04  15     Uranus at Opposition 
    05  03     S Taurid Meteor Shower
    05  13:23  Moon at Perigee: 358845 km
    05  18:38  Moon at Descending Node 
    06  06:29  Antares 3.9°S of Moon
    07  20:21  Venus 1.1°S of Moon: Occn.
    10  05:27  Saturn 4.1°N of Moon
    11  03:46  FIRST QUARTER MOON 
    11  08:13  Jupiter 4.4°N of Moon
    12  02     N Taurid Meteor Shower
    17  09     Leonid Meteor Shower
    18  23:58  FULL MOON 
    19  00:03  Partial Lunar Eclipse; mag=0.974
    19  08:59  Moon at Ascending Node 
    20  17:14  Moon at Apogee: 406276 km
    23  18:22  Pollux 2.5°N of Moon
    24  19:32  Beehive 3.3°S of Moon
    26  13:27  Regulus 5.2°S of Moon
    27  03:28  LAST QUARTER MOON 
    28  20     Mercury at Superior Conjunction 
    30  13:04  Spica 5.9°S of Moon

Dec 03  05:58  Moon at Descending Node 
    03  22:33  Total Solar Eclipse; mag=1.037
    03  22:43  NEW MOON 
    04  01:01  Moon at Perigee: 356794 km
    06  15:48  Venus 1.9°N of Moon
    07  16:52  Saturn 4.2°N of Moon
    08  21:07  Jupiter 4.5°N of Moon
    10  16:36  FIRST QUARTER MOON 
    13  22     Geminid Meteor Shower
    16  15:12  Moon at Ascending Node 
    17  17:16  Moon at Apogee: 406322 km
    18  19:36  FULL MOON 
    21  00:20  Pollux 2.6°N of Moon
    21  06:59  Winter Solstice 
    22  01:28  Beehive 3.3°S of Moon
    22  06     Ursid Meteor Shower
    23  19:40  Regulus 5.1°S of Moon
    26  17:24  LAST QUARTER MOON 
    27  00:15  Mars 4.4°N of Antares
    27  21:58  Spica 5.8°S of Moon
    28  20     Mercury 4.2° of Venus
    30  16:07  Moon at Descending Node 
    31  04:54  Antares 3.9°S of Moon
    31  11:13  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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