2021 Calendar of Astronomical Events




    


2021 Phases of the Moon

Pacific 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
Pacific Standard Time
New Moon First Quarter Full Moon Last Quarter
--- Jan 6 01:37
Jan 12 21:00 Jan 20 13:02 Jan 28 11:16 Feb 4 09:37
Feb 11 11:06 Feb 19 10:47 Feb 27 00:17 Mar 5 17:30
Mar 13 02:21 Mar 21 06:40 Mar 28 10:48 Apr 4 02:02
Apr 11 18:31 Apr 19 22:59 Apr 26 19:31 May 3 11:50
May 11 11:00 May 19 11:13 May 26 03:14 t Jun 1 23:24
Jun 10 02:53 A Jun 17 19:54 Jun 24 10:40 Jul 1 13:11
Jul 9 17:17 Jul 17 02:11 Jul 23 18:37 Jul 31 05:16
Aug 8 05:50 Aug 15 07:20 Aug 22 04:02 Aug 29 23:13
Sep 6 16:52 Sep 13 12:39 Sep 20 15:55 Sep 28 17:57
Oct 6 03:05 Oct 12 19:25 Oct 20 06:57 Oct 28 12:05
Nov 4 13:15 Nov 11 04:46 Nov 19 00:58 p Nov 27 04:28
Dec 3 23:43 T Dec 10 17:36 Dec 18 20:36 Dec 26 18:24

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

Pacific 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     PST   Event
        (h:m)

Jan 02  06     Earth at Perihelion: 0.98325 AU
    02  13:58  Regulus 4.7°S of Moon
    03  07     Quadrantid Meteor Shower
    06  01:37  LAST QUARTER MOON 
    09  07:39  Moon at Perigee: 367390 km
    09  18:08  Antares 5.6°S of Moon
    09  21     Mercury 1.6° of Saturn
    10  12:14  Moon at Descending Node 
    11  10     Mercury 1.4° of Jupiter
    11  12:12  Venus 1.5°N of Moon
    12  21:00  NEW MOON 
    14  00:15  Mercury 2.3°N of Moon
    20  13:02  FIRST QUARTER MOON 
    20  21:37  Mars 5.1°N of Moon
    21  05:11  Moon at Apogee: 404361 km
    23  18     Mercury at Greatest Elong: 18.6°E
    23  18     Saturn in Conjunction with Sun 
    23  20:39  Aldebaran 4.7°S of Moon
    24  13:47  Moon at Ascending Node 
    27  07:46  Pollux 3.8°N of Moon
    28  06:50  Beehive 2.3°S of Moon
    28  11:16  FULL MOON 
    28  17     Jupiter in Conjunction with Sun 
    28  18     Mercury at Perihelion 
    29  20:56  Regulus 4.6°S of Moon

Feb 03  11:33  Moon at Perigee: 370127 km
    04  09:37  LAST QUARTER MOON 
    06  00:33  Antares 5.5°S of Moon
    06  16:29  Moon at Descending Node 
    08  06     Mercury at Inferior Conjunction 
    11  11:06  NEW MOON 
    15  06     Mercury 3.8° of Jupiter
    18  02:22  Moon at Apogee: 404467 km
    18  14:47  Mars 3.7°N of Moon
    19  10:47  FIRST QUARTER MOON 
    19  21     Venus at Aphelion 
    20  05:15  Aldebaran 5.0°S of Moon
    20  17:44  Moon at Ascending Node 
    23  00     Mercury 4.0° of Saturn
    23  17:10  Pollux 3.7°N of Moon
    24  16:16  Beehive 2.4°S of Moon
    26  06:04  Regulus 4.6°S of Moon
    27  00:17  FULL MOON 

Mar 01  21:19  Moon at Perigee: 365422 km
    03  15:36  Mars 2.6°S of Pleiades
    04  21     Mercury 0.3° of Jupiter
    05  05:58  Antares 5.2°S of Moon
    05  16:56  Moon at Descending Node 
    05  17:30  LAST QUARTER MOON 
    06  03     Mercury at Greatest Elong: 27.3°W
    09  15:02  Saturn 3.7°N of Moon
    10  07:35  Jupiter 4.0°N of Moon
    10  16     Neptune in Conjunction with Sun 
    10  17:02  Mercury 3.7°N of Moon
    13  02:21  NEW MOON 
    13  18     Mercury at Aphelion 
    17  21:04  Moon at Apogee: 405253 km
    19  09:48  Mars 1.9°N of Moon
    19  13:13  Aldebaran 5.2°S of Moon
    19  19:31  Moon at Ascending Node 
    20  01:37  Vernal Equinox 
    20  11:15  Mars 6.9°N of Aldebaran
    21  06:40  FIRST QUARTER MOON 
    23  02:26  Pollux 3.5°N of Moon
    24  01:58  Beehive 2.6°S of Moon
    25  16:17  Regulus 4.7°S of Moon
    25  22     Venus at Superior Conjunction 
    28  10:48  FULL MOON 
    29  07:52  Spica 6.5°S of Moon
    29  22:12  Moon at Perigee: 360311 km

Apr 01  12:49  Antares 4.9°S of Moon
    01  18:41  Moon at Descending Node 
    04  02:02  LAST QUARTER MOON 
    06  00:34  Saturn 4.0°N of Moon
    06  23:15  Jupiter 4.4°N of Moon
    11  18:31  NEW MOON 
    14  09:47  Moon at Apogee: 406120 km
    15  20:07  Aldebaran 5.4°S of Moon
    15  21:53  Moon at Ascending Node 
    17  04:09  Mars 0.1°N of Moon: Occn.
    18  18     Mercury at Superior Conjunction 
    19  10:18  Pollux 3.2°N of Moon
    19  22:59  FIRST QUARTER MOON 
    20  10:25  Beehive 2.8°S of Moon
    22  01:48  Regulus 4.9°S of Moon
    22  04     Lyrid Meteor Shower
    25  18:43  Spica 6.5°S of Moon
    26  17     Mercury at Perihelion 
    26  19:31  FULL MOON 
    27  07:24  Moon at Perigee: 357379 km
    28  22:07  Antares 4.8°S of Moon
    29  01:17  Moon at Descending Node 
    30  13     Uranus in Conjunction with Sun 

May 03  09:02  Saturn 4.2°N of Moon
    03  11:50  LAST QUARTER MOON 
    03  19:03  Mercury 2.1°S of Pleiades
    04  13:00  Jupiter 4.6°N of Moon
    04  17     Eta-Aquarid Meteor Shower
    11  11:00  NEW MOON 
    11  13:54  Moon at Apogee: 406512 km
    13  02:29  Moon at Ascending Node 
    13  09:59  Mercury 2.1°N of Moon
    15  20:47  Mars 1.5°S of Moon
    16  16:39  Pollux 3.1°N of Moon
    16  22     Mercury at Greatest Elong: 22.0°E
    17  17:08  Beehive 2.9°S of Moon
    19  09:28  Regulus 5.0°S of Moon
    19  11:13  FIRST QUARTER MOON 
    23  05:07  Spica 6.5°S of Moon
    25  17:52  Moon at Perigee: 357310 km
    26  03:14  FULL MOON 
    26  03:19  Total Lunar Eclipse; mag=1.009
    26  08:55  Antares 4.8°S of Moon
    26  11:38  Moon at Descending Node 
    28  19     Mercury 0.4° of Venus
    30  17:22  Saturn 4.2°N of Moon
    31  03:41  Mars 5.2°S of Pollux

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

Date     PST   Event
        (h:m)

Jul 01  13:11  LAST QUARTER MOON 
    02  18:45  Venus 0.1°N of Beehive
    04  12     Mercury at Greatest Elong: 21.6°W
    05  06:48  Moon at Apogee: 405342 km
    05  15     Earth at Aphelion: 1.01673 AU
    06  14:41  Moon at Ascending Node 
    06  14:52  Aldebaran 5.5°S of Moon
    07  20:38  Mercury 3.7°S of Moon
    09  17:17  NEW MOON 
    12  01:10  Venus 3.3°S of Moon
    12  02:10  Mars 3.8°S of Moon
    12  16     Mars at Aphelion 
    12  21:02  Regulus 4.9°S of Moon
    16  20:01  Spica 6.4°S of Moon
    17  02:11  FIRST QUARTER MOON 
    20  04:06  Antares 4.7°S of Moon
    20  05:22  Moon at Descending Node 
    21  02:30  Moon at Perigee: 364520 km
    21  13:21  Venus 1.0°N of Regulus
    23  17     Mercury at Perihelion 
    23  18:37  FULL MOON 
    24  08:42  Saturn 3.8°N of Moon
    25  17:17  Jupiter 4.2°N of Moon
    27  19     Delta-Aquarid Meteor Shower
    29  06:09  Mars 0.6°N of Regulus
    31  05:16  LAST QUARTER MOON 

Aug 01  06     Mercury at Superior Conjunction 
    01  21     Saturn at Opposition 
    01  23:35  Moon at Apogee: 404412 km
    02  18:51  Moon at Ascending Node 
    02  22:18  Aldebaran 5.7°S of Moon
    06  11:42  Pollux 3.1°N of Moon
    08  05:50  NEW MOON 
    10  23:00  Venus 4.3°S of Moon
    12  11     Perseid Meteor Shower
    13  01:31  Spica 6.1°S of Moon
    15  07:20  FIRST QUARTER MOON 
    16  08:04  Moon at Descending Node 
    16  10:34  Antares 4.5°S of Moon
    17  01:23  Moon at Perigee: 369127 km
    18  19     Mercury 0.1° of Mars
    19  15     Jupiter at Opposition 
    20  14:19  Saturn 3.7°N of Moon
    21  20:52  Jupiter 4.0°N of Moon
    22  04:02  FULL MOON 
    29  18:22  Moon at Apogee: 404100 km
    29  21:13  Moon at Ascending Node 
    29  23:13  LAST QUARTER MOON 

Sep 02  20:04  Pollux 3.0°N of Moon
    03  20:07  Beehive 2.9°S of Moon
    05  06:32  Venus 1.4°N of Spica
    05  16     Mercury at Aphelion 
    06  16:52  NEW MOON 
    09  08:01  Spica 5.9°S of Moon
    09  18:09  Venus 4.1°S of Moon
    11  02:05  Moon at Perigee: 368464 km
    12  08:35  Moon at Descending Node 
    12  15:59  Antares 4.2°S of Moon
    13  12:39  FIRST QUARTER MOON 
    13  20     Mercury at Greatest Elong: 26.8°E
    14  00     Neptune at Opposition 
    16  18:37  Saturn 3.8°N of Moon
    17  22:50  Jupiter 4.0°N of Moon
    20  15:55  FULL MOON 
    20  18:00  Mercury 1.2°S of Spica
    22  11:21  Autumnal Equinox 
    25  23:33  Moon at Ascending Node 
    26  13:44  Moon at Apogee: 404641 km
    28  17:57  LAST QUARTER MOON 
    30  04:44  Pollux 2.8°N of Moon

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

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

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