2021 Calendar of Astronomical Events




    


2021 Phases of the Moon

Eastern 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
Eastern Standard Time
New Moon First Quarter Full Moon Last Quarter
--- Jan 6 04:37
Jan 13 00:00 Jan 20 16:02 Jan 28 14:16 Feb 4 12:37
Feb 11 14:06 Feb 19 13:47 Feb 27 03:17 Mar 5 20:30
Mar 13 05:21 Mar 21 09:40 Mar 28 13:48 Apr 4 05:02
Apr 11 21:31 Apr 20 01:59 Apr 26 22:31 May 3 14:50
May 11 14:00 May 19 14:13 May 26 06:14 t Jun 2 02:24
Jun 10 05:53 A Jun 17 22:54 Jun 24 13:40 Jul 1 16:11
Jul 9 20:17 Jul 17 05:11 Jul 23 21:37 Jul 31 08:16
Aug 8 08:50 Aug 15 10:20 Aug 22 07:02 Aug 30 02:13
Sep 6 19:52 Sep 13 15:39 Sep 20 18:55 Sep 28 20:57
Oct 6 06:05 Oct 12 22:25 Oct 20 09:57 Oct 28 15:05
Nov 4 16:15 Nov 11 07:46 Nov 19 03:58 p Nov 27 07:28
Dec 4 02:43 T Dec 10 20:36 Dec 18 23:36 Dec 26 21:24

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

Eastern 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     EST   Event
        (h:m)

Jan 01  02:05  Beehive 2.3°S of Moon
    02  09     Earth at Perihelion: 0.98325 AU
    02  16:58  Regulus 4.7°S of Moon
    03  10     Quadrantid Meteor Shower
    06  04:37  LAST QUARTER MOON 
    09  10:39  Moon at Perigee: 367390 km
    09  21:08  Antares 5.6°S of Moon
    10  00     Mercury 1.6° of Saturn
    10  15:14  Moon at Descending Node 
    11  13     Mercury 1.4° of Jupiter
    11  15:12  Venus 1.5°N of Moon
    13  00:00  NEW MOON 
    14  03:15  Mercury 2.3°N of Moon
    20  16:02  FIRST QUARTER MOON 
    21  00:37  Mars 5.1°N of Moon
    21  08:11  Moon at Apogee: 404361 km
    23  21     Mercury at Greatest Elong: 18.6°E
    23  21     Saturn in Conjunction with Sun 
    23  23:39  Aldebaran 4.7°S of Moon
    24  16:47  Moon at Ascending Node 
    27  10:46  Pollux 3.8°N of Moon
    28  09:50  Beehive 2.3°S of Moon
    28  14:16  FULL MOON 
    28  20     Jupiter in Conjunction with Sun 
    28  21     Mercury at Perihelion 
    29  23:56  Regulus 4.6°S of Moon

Feb 03  14:33  Moon at Perigee: 370127 km
    04  12:37  LAST QUARTER MOON 
    06  03:33  Antares 5.5°S of Moon
    06  19:29  Moon at Descending Node 
    08  09     Mercury at Inferior Conjunction 
    11  14:06  NEW MOON 
    15  09     Mercury 3.8° of Jupiter
    18  05:22  Moon at Apogee: 404467 km
    18  17:47  Mars 3.7°N of Moon
    19  13:47  FIRST QUARTER MOON 
    20  00     Venus at Aphelion 
    20  08:15  Aldebaran 5.0°S of Moon
    20  20:44  Moon at Ascending Node 
    23  03     Mercury 4.0° of Saturn
    23  20:10  Pollux 3.7°N of Moon
    24  19:16  Beehive 2.4°S of Moon
    26  09:04  Regulus 4.6°S of Moon
    27  03:17  FULL MOON 

Mar 02  00:19  Moon at Perigee: 365422 km
    03  18:36  Mars 2.6°S of Pleiades
    05  00     Mercury 0.3° of Jupiter
    05  08:58  Antares 5.2°S of Moon
    05  19:56  Moon at Descending Node 
    05  20:30  LAST QUARTER MOON 
    06  06     Mercury at Greatest Elong: 27.3°W
    09  18:02  Saturn 3.7°N of Moon
    10  10:35  Jupiter 4.0°N of Moon
    10  19     Neptune in Conjunction with Sun 
    10  20:02  Mercury 3.7°N of Moon
    13  05:21  NEW MOON 
    13  21     Mercury at Aphelion 
    18  00:04  Moon at Apogee: 405253 km
    19  12:48  Mars 1.9°N of Moon
    19  16:13  Aldebaran 5.2°S of Moon
    19  22:31  Moon at Ascending Node 
    20  04:37  Vernal Equinox 
    20  14:15  Mars 6.9°N of Aldebaran
    21  09:40  FIRST QUARTER MOON 
    23  05:26  Pollux 3.5°N of Moon
    24  04:58  Beehive 2.6°S of Moon
    25  19:17  Regulus 4.7°S of Moon
    26  01     Venus at Superior Conjunction 
    28  13:48  FULL MOON 
    29  10:52  Spica 6.5°S of Moon
    30  01:12  Moon at Perigee: 360311 km

Apr 01  15:49  Antares 4.9°S of Moon
    01  21:41  Moon at Descending Node 
    04  05:02  LAST QUARTER MOON 
    06  03:34  Saturn 4.0°N of Moon
    07  02:15  Jupiter 4.4°N of Moon
    11  21:31  NEW MOON 
    14  12:47  Moon at Apogee: 406120 km
    15  23:07  Aldebaran 5.4°S of Moon
    16  00:53  Moon at Ascending Node 
    17  07:09  Mars 0.1°N of Moon: Occn.
    18  21     Mercury at Superior Conjunction 
    19  13:18  Pollux 3.2°N of Moon
    20  01:59  FIRST QUARTER MOON 
    20  13:25  Beehive 2.8°S of Moon
    22  04:48  Regulus 4.9°S of Moon
    22  07     Lyrid Meteor Shower
    25  21:43  Spica 6.5°S of Moon
    26  20     Mercury at Perihelion 
    26  22:31  FULL MOON 
    27  10:24  Moon at Perigee: 357379 km
    29  01:07  Antares 4.8°S of Moon
    29  04:17  Moon at Descending Node 
    30  16     Uranus in Conjunction with Sun 

May 03  12:02  Saturn 4.2°N of Moon
    03  14:50  LAST QUARTER MOON 
    03  22:03  Mercury 2.1°S of Pleiades
    04  16:00  Jupiter 4.6°N of Moon
    04  20     Eta-Aquarid Meteor Shower
    11  14:00  NEW MOON 
    11  16:54  Moon at Apogee: 406512 km
    13  05:29  Moon at Ascending Node 
    13  12:59  Mercury 2.1°N of Moon
    15  23:47  Mars 1.5°S of Moon
    16  19:39  Pollux 3.1°N of Moon
    17  01     Mercury at Greatest Elong: 22.0°E
    17  20:08  Beehive 2.9°S of Moon
    19  12:28  Regulus 5.0°S of Moon
    19  14:13  FIRST QUARTER MOON 
    23  08:07  Spica 6.5°S of Moon
    25  20:52  Moon at Perigee: 357310 km
    26  06:14  FULL MOON 
    26  06:19  Total Lunar Eclipse; mag=1.009
    26  11:55  Antares 4.8°S of Moon
    26  14:38  Moon at Descending Node 
    28  22     Mercury 0.4° of Venus
    30  20:22  Saturn 4.2°N of Moon
    31  06:41  Mars 5.2°S of Pollux

Jun 01  03:57  Jupiter 4.6°N of Moon
    02  02:24  LAST QUARTER MOON 
    07  21:27  Moon at Apogee: 406230 km
    09  11:42  Moon at Ascending Node 
    10  05:42  Annular Solar Eclipse; mag=0.943
    10  05:53  NEW MOON 
    10  20     Mercury at Inferior Conjunction 
    12  01:44  Venus 1.5°S of Moon
    12  08     Venus at Perihelion 
    13  01:19  Pollux 3.1°N of Moon
    13  14:52  Mars 2.8°S of Moon
    14  01:47  Beehive 2.9°S of Moon
    15  18:28  Regulus 5.0°S of Moon
    17  22:54  FIRST QUARTER MOON 
    20  22:32  Summer Solstice 
    21  10:57  Venus 5.1°S of Pollux
    22  15:36  Mercury 1.8°N of Aldebaran
    22  22:26  Antares 4.8°S of Moon
    23  00:21  Mars 0.3°S of Beehive
    23  01:07  Moon at Descending Node 
    23  04:58  Moon at Perigee: 359960 km
    24  13:40  FULL MOON 
    27  04:30  Saturn 4.0°N of Moon
    28  13:38  Jupiter 4.5°N of Moon

Date     EST   Event
        (h:m)

Jul 01  16:11  LAST QUARTER MOON 
    02  21:45  Venus 0.1°N of Beehive
    04  15     Mercury at Greatest Elong: 21.6°W
    05  09:48  Moon at Apogee: 405342 km
    05  18     Earth at Aphelion: 1.01673 AU
    06  17:41  Moon at Ascending Node 
    06  17:52  Aldebaran 5.5°S of Moon
    07  23:38  Mercury 3.7°S of Moon
    09  20:17  NEW MOON 
    12  04:10  Venus 3.3°S of Moon
    12  05:10  Mars 3.8°S of Moon
    12  19     Mars at Aphelion 
    13  00:02  Regulus 4.9°S of Moon
    16  23:01  Spica 6.4°S of Moon
    17  05:11  FIRST QUARTER MOON 
    20  07:06  Antares 4.7°S of Moon
    20  08:22  Moon at Descending Node 
    21  05:30  Moon at Perigee: 364520 km
    21  16:21  Venus 1.0°N of Regulus
    23  20     Mercury at Perihelion 
    23  21:37  FULL MOON 
    24  11:42  Saturn 3.8°N of Moon
    25  20:17  Jupiter 4.2°N of Moon
    27  22     Delta-Aquarid Meteor Shower
    29  09:09  Mars 0.6°N of Regulus
    31  08:16  LAST QUARTER MOON 

Aug 01  09     Mercury at Superior Conjunction 
    02  00     Saturn at Opposition 
    02  02:35  Moon at Apogee: 404412 km
    02  21:51  Moon at Ascending Node 
    03  01:18  Aldebaran 5.7°S of Moon
    06  14:42  Pollux 3.1°N of Moon
    08  08:50  NEW MOON 
    11  02:00  Venus 4.3°S of Moon
    12  14     Perseid Meteor Shower
    13  04:31  Spica 6.1°S of Moon
    15  10:20  FIRST QUARTER MOON 
    16  11:04  Moon at Descending Node 
    16  13:34  Antares 4.5°S of Moon
    17  04:23  Moon at Perigee: 369127 km
    18  22     Mercury 0.1° of Mars
    19  18     Jupiter at Opposition 
    20  17:19  Saturn 3.7°N of Moon
    21  23:52  Jupiter 4.0°N of Moon
    22  07:02  FULL MOON 
    29  21:22  Moon at Apogee: 404100 km
    30  00:13  Moon at Ascending Node 
    30  02:13  LAST QUARTER MOON 

Sep 02  23:04  Pollux 3.0°N of Moon
    03  23:07  Beehive 2.9°S of Moon
    05  09:32  Venus 1.4°N of Spica
    05  19     Mercury at Aphelion 
    06  19:52  NEW MOON 
    09  11:01  Spica 5.9°S of Moon
    09  21:09  Venus 4.1°S of Moon
    11  05:05  Moon at Perigee: 368464 km
    12  11:35  Moon at Descending Node 
    12  18:59  Antares 4.2°S of Moon
    13  15:39  FIRST QUARTER MOON 
    13  23     Mercury at Greatest Elong: 26.8°E
    14  03     Neptune at Opposition 
    16  21:37  Saturn 3.8°N of Moon
    18  01:50  Jupiter 4.0°N of Moon
    20  18:55  FULL MOON 
    20  21:00  Mercury 1.2°S of Spica
    22  14:21  Autumnal Equinox 
    26  02:33  Moon at Ascending Node 
    26  16:44  Moon at Apogee: 404641 km
    28  20:57  LAST QUARTER MOON 
    30  07:44  Pollux 2.8°N of Moon

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

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

Dec 03  09:58  Moon at Descending Node 
    04  02:33  Total Solar Eclipse; mag=1.037
    04  02:43  NEW MOON 
    04  05:01  Moon at Perigee: 356794 km
    06  19:48  Venus 1.9°N of Moon
    07  20:52  Saturn 4.2°N of Moon
    09  01:07  Jupiter 4.5°N of Moon
    10  20:36  FIRST QUARTER MOON 
    14  02     Geminid Meteor Shower
    16  19:12  Moon at Ascending Node 
    17  21:16  Moon at Apogee: 406322 km
    18  23:36  FULL MOON 
    21  04:20  Pollux 2.6°N of Moon
    21  10:59  Winter Solstice 
    22  05:28  Beehive 3.3°S of Moon
    22  10     Ursid Meteor Shower
    23  23:40  Regulus 5.1°S of Moon
    26  21:24  LAST QUARTER MOON 
    27  04:15  Mars 4.4°N of Antares
    28  01:58  Spica 5.8°S of Moon
    29  00     Mercury 4.2° of Venus
    30  20:07  Moon at Descending Node 
    31  08:54  Antares 3.9°S of Moon
    31  15:13  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:


Return to: Planetary Ephemeris Data