2021 Calendar of Astronomical Events



2021 Phases of the Moon

Greenwich Mean 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
Greenwich Mean Time
New Moon First Quarter Full Moon Last Quarter
--- Jan 6 09:37
Jan 13 05:00 Jan 20 21:02 Jan 28 19:16 Feb 4 17:37
Feb 11 19:06 Feb 19 18:47 Feb 27 08:17 Mar 6 01:30
Mar 13 10:21 Mar 21 14:40 Mar 28 18:48 Apr 4 10:02
Apr 12 02:31 Apr 20 06:59 Apr 27 03:31 May 3 19:50
May 11 19:00 May 19 19:13 May 26 11:14 t Jun 2 07:24
Jun 10 10:53 A Jun 18 03:54 Jun 24 18:40 Jul 1 21:11
Jul 10 01:17 Jul 17 10:11 Jul 24 02:37 Jul 31 13:16
Aug 8 13:50 Aug 15 15:20 Aug 22 12:02 Aug 30 07:13
Sep 7 00:52 Sep 13 20:39 Sep 20 23:55 Sep 29 01:57
Oct 6 11:05 Oct 13 03:25 Oct 20 14:57 Oct 28 20:05
Nov 4 21:15 Nov 11 12:46 Nov 19 08:58 p Nov 27 12:28
Dec 4 07:43 T Dec 11 01:36 Dec 19 04:36 Dec 27 02:24

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

Greenwich Mean 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     GMT   Event
        (h:m)

Jan 01  07:05  Beehive 2.3°S of Moon
    02  14     Earth at Perihelion: 0.98325 AU
    02  21:58  Regulus 4.7°S of Moon
    03  15     Quadrantid Meteor Shower
    06  09:37  LAST QUARTER MOON 
    09  15:39  Moon at Perigee: 367390 km
    10  02:08  Antares 5.6°S of Moon
    10  05     Mercury 1.6° of Saturn
    10  20:14  Moon at Descending Node 
    11  18     Mercury 1.4° of Jupiter
    11  20:12  Venus 1.5°N of Moon
    13  05:00  NEW MOON 
    14  08:15  Mercury 2.3°N of Moon
    20  21:02  FIRST QUARTER MOON 
    21  05:37  Mars 5.1°N of Moon
    21  13:11  Moon at Apogee: 404361 km
    24  02     Mercury at Greatest Elong: 18.6°E
    24  02     Saturn in Conjunction with Sun 
    24  04:39  Aldebaran 4.7°S of Moon
    24  21:47  Moon at Ascending Node 
    27  15:46  Pollux 3.8°N of Moon
    28  14:50  Beehive 2.3°S of Moon
    28  19:16  FULL MOON 
    29  01     Jupiter in Conjunction with Sun 
    29  02     Mercury at Perihelion 
    30  04:56  Regulus 4.6°S of Moon

Feb 03  19:33  Moon at Perigee: 370127 km
    04  17:37  LAST QUARTER MOON 
    06  08:33  Antares 5.5°S of Moon
    07  00:29  Moon at Descending Node 
    08  14     Mercury at Inferior Conjunction 
    11  19:06  NEW MOON 
    15  14     Mercury 3.8° of Jupiter
    18  10:22  Moon at Apogee: 404467 km
    18  22:47  Mars 3.7°N of Moon
    19  18:47  FIRST QUARTER MOON 
    20  05     Venus at Aphelion 
    20  13:15  Aldebaran 5.0°S of Moon
    21  01:44  Moon at Ascending Node 
    23  08     Mercury 4.0° of Saturn
    24  01:10  Pollux 3.7°N of Moon
    25  00:16  Beehive 2.4°S of Moon
    26  14:04  Regulus 4.6°S of Moon
    27  08:17  FULL MOON 

Mar 02  05:19  Moon at Perigee: 365422 km
    03  23:36  Mars 2.6°S of Pleiades
    05  05     Mercury 0.3° of Jupiter
    05  13:58  Antares 5.2°S of Moon
    06  00:56  Moon at Descending Node 
    06  01:30  LAST QUARTER MOON 
    06  11     Mercury at Greatest Elong: 27.3°W
    09  23:02  Saturn 3.7°N of Moon
    10  15:35  Jupiter 4.0°N of Moon
    11  00     Neptune in Conjunction with Sun 
    11  01:02  Mercury 3.7°N of Moon
    13  10:21  NEW MOON 
    14  02     Mercury at Aphelion 
    18  05:04  Moon at Apogee: 405253 km
    19  17:48  Mars 1.9°N of Moon
    19  21:13  Aldebaran 5.2°S of Moon
    20  03:31  Moon at Ascending Node 
    20  09:37  Vernal Equinox 
    20  19:15  Mars 6.9°N of Aldebaran
    21  14:40  FIRST QUARTER MOON 
    23  10:26  Pollux 3.5°N of Moon
    24  09:58  Beehive 2.6°S of Moon
    26  00:17  Regulus 4.7°S of Moon
    26  06     Venus at Superior Conjunction 
    28  18:48  FULL MOON 
    29  15:52  Spica 6.5°S of Moon
    30  06:12  Moon at Perigee: 360311 km

Apr 01  20:49  Antares 4.9°S of Moon
    02  02:41  Moon at Descending Node 
    04  10:02  LAST QUARTER MOON 
    06  08:34  Saturn 4.0°N of Moon
    07  07:15  Jupiter 4.4°N of Moon
    12  02:31  NEW MOON 
    14  17:47  Moon at Apogee: 406120 km
    16  04:07  Aldebaran 5.4°S of Moon
    16  05:53  Moon at Ascending Node 
    17  12:09  Mars 0.1°N of Moon: Occn.
    19  02     Mercury at Superior Conjunction 
    19  18:18  Pollux 3.2°N of Moon
    20  06:59  FIRST QUARTER MOON 
    20  18:25  Beehive 2.8°S of Moon
    22  09:48  Regulus 4.9°S of Moon
    22  12     Lyrid Meteor Shower
    26  02:43  Spica 6.5°S of Moon
    27  01     Mercury at Perihelion 
    27  03:31  FULL MOON 
    27  15:24  Moon at Perigee: 357379 km
    29  06:07  Antares 4.8°S of Moon
    29  09:17  Moon at Descending Node 
    30  21     Uranus in Conjunction with Sun 

May 03  17:02  Saturn 4.2°N of Moon
    03  19:50  LAST QUARTER MOON 
    04  03:03  Mercury 2.1°S of Pleiades
    04  21:00  Jupiter 4.6°N of Moon
    05  01     Eta-Aquarid Meteor Shower
    11  19:00  NEW MOON 
    11  21:54  Moon at Apogee: 406512 km
    13  10:29  Moon at Ascending Node 
    13  17:59  Mercury 2.1°N of Moon
    16  04:47  Mars 1.5°S of Moon
    17  00:39  Pollux 3.1°N of Moon
    17  06     Mercury at Greatest Elong: 22.0°E
    18  01:08  Beehive 2.9°S of Moon
    19  17:28  Regulus 5.0°S of Moon
    19  19:13  FIRST QUARTER MOON 
    23  13:07  Spica 6.5°S of Moon
    26  01:52  Moon at Perigee: 357310 km
    26  11:14  FULL MOON 
    26  11:19  Total Lunar Eclipse; mag=1.009
    26  16:55  Antares 4.8°S of Moon
    26  19:38  Moon at Descending Node 
    29  03     Mercury 0.4° of Venus
    31  01:22  Saturn 4.2°N of Moon
    31  11:41  Mars 5.2°S of Pollux

Jun 01  08:57  Jupiter 4.6°N of Moon
    02  07:24  LAST QUARTER MOON 
    08  02:27  Moon at Apogee: 406230 km
    09  16:42  Moon at Ascending Node 
    10  10:42  Annular Solar Eclipse; mag=0.943
    10  10:53  NEW MOON 
    11  01     Mercury at Inferior Conjunction 
    12  06:44  Venus 1.5°S of Moon
    12  13     Venus at Perihelion 
    13  06:19  Pollux 3.1°N of Moon
    13  19:52  Mars 2.8°S of Moon
    14  06:47  Beehive 2.9°S of Moon
    15  23:28  Regulus 5.0°S of Moon
    18  03:54  FIRST QUARTER MOON 
    21  03:32  Summer Solstice 
    21  15:57  Venus 5.1°S of Pollux
    22  20:36  Mercury 1.8°N of Aldebaran
    23  03:26  Antares 4.8°S of Moon
    23  05:21  Mars 0.3°S of Beehive
    23  06:07  Moon at Descending Node 
    23  09:58  Moon at Perigee: 359960 km
    24  18:40  FULL MOON 
    27  09:30  Saturn 4.0°N of Moon
    28  18:38  Jupiter 4.5°N of Moon

Date     GMT   Event
        (h:m)

Jul 01  21:11  LAST QUARTER MOON 
    03  02:45  Venus 0.1°N of Beehive
    04  20     Mercury at Greatest Elong: 21.6°W
    05  14:48  Moon at Apogee: 405342 km
    05  23     Earth at Aphelion: 1.01673 AU
    06  22:41  Moon at Ascending Node 
    06  22:52  Aldebaran 5.5°S of Moon
    08  04:38  Mercury 3.7°S of Moon
    10  01:17  NEW MOON 
    12  09:10  Venus 3.3°S of Moon
    12  10:10  Mars 3.8°S of Moon
    13  00     Mars at Aphelion 
    13  05:02  Regulus 4.9°S of Moon
    17  04:01  Spica 6.4°S of Moon
    17  10:11  FIRST QUARTER MOON 
    20  12:06  Antares 4.7°S of Moon
    20  13:22  Moon at Descending Node 
    21  10:30  Moon at Perigee: 364520 km
    21  21:21  Venus 1.0°N of Regulus
    24  01     Mercury at Perihelion 
    24  02:37  FULL MOON 
    24  16:42  Saturn 3.8°N of Moon
    26  01:17  Jupiter 4.2°N of Moon
    28  03     Delta-Aquarid Meteor Shower
    29  14:09  Mars 0.6°N of Regulus
    31  13:16  LAST QUARTER MOON 

Aug 01  14     Mercury at Superior Conjunction 
    02  05     Saturn at Opposition 
    02  07:35  Moon at Apogee: 404412 km
    03  02:51  Moon at Ascending Node 
    03  06:18  Aldebaran 5.7°S of Moon
    06  19:42  Pollux 3.1°N of Moon
    08  13:50  NEW MOON 
    11  07:00  Venus 4.3°S of Moon
    12  19     Perseid Meteor Shower
    13  09:31  Spica 6.1°S of Moon
    15  15:20  FIRST QUARTER MOON 
    16  16:04  Moon at Descending Node 
    16  18:34  Antares 4.5°S of Moon
    17  09:23  Moon at Perigee: 369127 km
    19  03     Mercury 0.1° of Mars
    19  23     Jupiter at Opposition 
    20  22:19  Saturn 3.7°N of Moon
    22  04:52  Jupiter 4.0°N of Moon
    22  12:02  FULL MOON 
    30  02:22  Moon at Apogee: 404100 km
    30  05:13  Moon at Ascending Node 
    30  07:13  LAST QUARTER MOON 

Sep 03  04:04  Pollux 3.0°N of Moon
    04  04:07  Beehive 2.9°S of Moon
    05  14:32  Venus 1.4°N of Spica
    06  00     Mercury at Aphelion 
    07  00:52  NEW MOON 
    09  16:01  Spica 5.9°S of Moon
    10  02:09  Venus 4.1°S of Moon
    11  10:05  Moon at Perigee: 368464 km
    12  16:35  Moon at Descending Node 
    12  23:59  Antares 4.2°S of Moon
    13  20:39  FIRST QUARTER MOON 
    14  04     Mercury at Greatest Elong: 26.8°E
    14  08     Neptune at Opposition 
    17  02:37  Saturn 3.8°N of Moon
    18  06:50  Jupiter 4.0°N of Moon
    20  23:55  FULL MOON 
    21  02:00  Mercury 1.2°S of Spica
    22  19:21  Autumnal Equinox 
    26  07:33  Moon at Ascending Node 
    26  21:44  Moon at Apogee: 404641 km
    29  01:57  LAST QUARTER MOON 
    30  12:44  Pollux 2.8°N of Moon

Oct 01  13:07  Beehive 3.1°S of Moon
    02  22     Venus at Aphelion 
    03  05:12  Regulus 4.9°S of Moon
    06  11:05  NEW MOON 
    08  04     Mars in Conjunction with Sun 
    08  17:28  Moon at Perigee: 363388 km
    09  16     Mercury at Inferior Conjunction 
    09  18:36  Venus 2.9°S of Moon
    09  19:35  Moon at Descending Node 
    10  06:27  Antares 4.0°S of Moon
    13  03:25  FIRST QUARTER MOON 
    14  07:12  Saturn 3.9°N of Moon
    15  09:58  Jupiter 4.1°N of Moon
    16  13:24  Venus 1.4°N of Antares
    20  00     Mercury at Perihelion 
    20  14:57  FULL MOON 
    21  11     Orionid Meteor Shower
    23  11:47  Moon at Ascending Node 
    24  15:30  Moon at Apogee: 405616 km
    25  05     Mercury at Greatest Elong: 18.4°W
    27  20:40  Pollux 2.6°N of Moon
    28  20:05  LAST QUARTER MOON 
    28  21:32  Beehive 3.3°S of Moon
    29  22     Venus at Greatest Elong: 47.0°E
    30  14:33  Regulus 5.1°S of Moon

Nov 02  01:18  Mercury 3.7°N of Spica
    03  18:40  Mercury 1.2°S of Moon: Occn.
    04  21:15  NEW MOON 
    05  00     Uranus at Opposition 
    05  12     S Taurid Meteor Shower
    05  22:23  Moon at Perigee: 358845 km
    06  03:38  Moon at Descending Node 
    06  15:29  Antares 3.9°S of Moon
    08  05:21  Venus 1.1°S of Moon: Occn.
    10  14:27  Saturn 4.1°N of Moon
    11  12:46  FIRST QUARTER MOON 
    11  17:13  Jupiter 4.4°N of Moon
    12  11     N Taurid Meteor Shower
    17  18     Leonid Meteor Shower
    19  08:58  FULL MOON 
    19  09:03  Partial Lunar Eclipse; mag=0.974
    19  17:59  Moon at Ascending Node 
    21  02:14  Moon at Apogee: 406276 km
    24  03:22  Pollux 2.5°N of Moon
    25  04:32  Beehive 3.3°S of Moon
    26  22:27  Regulus 5.2°S of Moon
    27  12:28  LAST QUARTER MOON 
    29  05     Mercury at Superior Conjunction 
    30  22:04  Spica 5.9°S of Moon

Dec 03  14:58  Moon at Descending Node 
    04  07:33  Total Solar Eclipse; mag=1.037
    04  07:43  NEW MOON 
    04  10:01  Moon at Perigee: 356794 km
    07  00:48  Venus 1.9°N of Moon
    08  01:52  Saturn 4.2°N of Moon
    09  06:07  Jupiter 4.5°N of Moon
    11  01:36  FIRST QUARTER MOON 
    14  07     Geminid Meteor Shower
    17  00:12  Moon at Ascending Node 
    18  02:16  Moon at Apogee: 406322 km
    19  04:36  FULL MOON 
    21  09:20  Pollux 2.6°N of Moon
    21  15:59  Winter Solstice 
    22  10:28  Beehive 3.3°S of Moon
    22  15     Ursid Meteor Shower
    24  04:40  Regulus 5.1°S of Moon
    27  02:24  LAST QUARTER MOON 
    27  09:15  Mars 4.4°N of Antares
    28  06:58  Spica 5.8°S of Moon
    29  05     Mercury 4.2° of Venus
    31  01:07  Moon at Descending Node 
    31  13:54  Antares 3.9°S of Moon
    31  20:13  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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