2021 Calendar of Astronomical Events




    


2021 Phases of the Moon

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

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

Mountain 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     MST   Event
        (h:m)

Jan 01  00:05  Beehive 2.3°S of Moon
    02  07     Earth at Perihelion: 0.98325 AU
    02  14:58  Regulus 4.7°S of Moon
    03  08     Quadrantid Meteor Shower
    06  02:37  LAST QUARTER MOON 
    09  08:39  Moon at Perigee: 367390 km
    09  19:08  Antares 5.6°S of Moon
    09  22     Mercury 1.6° of Saturn
    10  13:14  Moon at Descending Node 
    11  11     Mercury 1.4° of Jupiter
    11  13:12  Venus 1.5°N of Moon
    12  22:00  NEW MOON 
    14  01:15  Mercury 2.3°N of Moon
    20  14:02  FIRST QUARTER MOON 
    20  22:37  Mars 5.1°N of Moon
    21  06:11  Moon at Apogee: 404361 km
    23  19     Mercury at Greatest Elong: 18.6°E
    23  19     Saturn in Conjunction with Sun 
    23  21:39  Aldebaran 4.7°S of Moon
    24  14:47  Moon at Ascending Node 
    27  08:46  Pollux 3.8°N of Moon
    28  07:50  Beehive 2.3°S of Moon
    28  12:16  FULL MOON 
    28  18     Jupiter in Conjunction with Sun 
    28  19     Mercury at Perihelion 
    29  21:56  Regulus 4.6°S of Moon

Feb 03  12:33  Moon at Perigee: 370127 km
    04  10:37  LAST QUARTER MOON 
    06  01:33  Antares 5.5°S of Moon
    06  17:29  Moon at Descending Node 
    08  07     Mercury at Inferior Conjunction 
    11  12:06  NEW MOON 
    15  07     Mercury 3.8° of Jupiter
    18  03:22  Moon at Apogee: 404467 km
    18  15:47  Mars 3.7°N of Moon
    19  11:47  FIRST QUARTER MOON 
    19  22     Venus at Aphelion 
    20  06:15  Aldebaran 5.0°S of Moon
    20  18:44  Moon at Ascending Node 
    23  01     Mercury 4.0° of Saturn
    23  18:10  Pollux 3.7°N of Moon
    24  17:16  Beehive 2.4°S of Moon
    26  07:04  Regulus 4.6°S of Moon
    27  01:17  FULL MOON 

Mar 01  22:19  Moon at Perigee: 365422 km
    03  16:36  Mars 2.6°S of Pleiades
    04  22     Mercury 0.3° of Jupiter
    05  06:58  Antares 5.2°S of Moon
    05  17:56  Moon at Descending Node 
    05  18:30  LAST QUARTER MOON 
    06  04     Mercury at Greatest Elong: 27.3°W
    09  16:02  Saturn 3.7°N of Moon
    10  08:35  Jupiter 4.0°N of Moon
    10  17     Neptune in Conjunction with Sun 
    10  18:02  Mercury 3.7°N of Moon
    13  03:21  NEW MOON 
    13  19     Mercury at Aphelion 
    17  22:04  Moon at Apogee: 405253 km
    19  10:48  Mars 1.9°N of Moon
    19  14:13  Aldebaran 5.2°S of Moon
    19  20:31  Moon at Ascending Node 
    20  02:37  Vernal Equinox 
    20  12:15  Mars 6.9°N of Aldebaran
    21  07:40  FIRST QUARTER MOON 
    23  03:26  Pollux 3.5°N of Moon
    24  02:58  Beehive 2.6°S of Moon
    25  17:17  Regulus 4.7°S of Moon
    25  23     Venus at Superior Conjunction 
    28  11:48  FULL MOON 
    29  08:52  Spica 6.5°S of Moon
    29  23:12  Moon at Perigee: 360311 km

Apr 01  13:49  Antares 4.9°S of Moon
    01  19:41  Moon at Descending Node 
    04  03:02  LAST QUARTER MOON 
    06  01:34  Saturn 4.0°N of Moon
    07  00:15  Jupiter 4.4°N of Moon
    11  19:31  NEW MOON 
    14  10:47  Moon at Apogee: 406120 km
    15  21:07  Aldebaran 5.4°S of Moon
    15  22:53  Moon at Ascending Node 
    17  05:09  Mars 0.1°N of Moon: Occn.
    18  19     Mercury at Superior Conjunction 
    19  11:18  Pollux 3.2°N of Moon
    19  23:59  FIRST QUARTER MOON 
    20  11:25  Beehive 2.8°S of Moon
    22  02:48  Regulus 4.9°S of Moon
    22  05     Lyrid Meteor Shower
    25  19:43  Spica 6.5°S of Moon
    26  18     Mercury at Perihelion 
    26  20:31  FULL MOON 
    27  08:24  Moon at Perigee: 357379 km
    28  23:07  Antares 4.8°S of Moon
    29  02:17  Moon at Descending Node 
    30  14     Uranus in Conjunction with Sun 

May 03  10:02  Saturn 4.2°N of Moon
    03  12:50  LAST QUARTER MOON 
    03  20:03  Mercury 2.1°S of Pleiades
    04  14:00  Jupiter 4.6°N of Moon
    04  18     Eta-Aquarid Meteor Shower
    11  12:00  NEW MOON 
    11  14:54  Moon at Apogee: 406512 km
    13  03:29  Moon at Ascending Node 
    13  10:59  Mercury 2.1°N of Moon
    15  21:47  Mars 1.5°S of Moon
    16  17:39  Pollux 3.1°N of Moon
    16  23     Mercury at Greatest Elong: 22.0°E
    17  18:08  Beehive 2.9°S of Moon
    19  10:28  Regulus 5.0°S of Moon
    19  12:13  FIRST QUARTER MOON 
    23  06:07  Spica 6.5°S of Moon
    25  18:52  Moon at Perigee: 357310 km
    26  04:14  FULL MOON 
    26  04:19  Total Lunar Eclipse; mag=1.009
    26  09:55  Antares 4.8°S of Moon
    26  12:38  Moon at Descending Node 
    28  20     Mercury 0.4° of Venus
    30  18:22  Saturn 4.2°N of Moon
    31  04:41  Mars 5.2°S of Pollux

Jun 01  01:57  Jupiter 4.6°N of Moon
    02  00:24  LAST QUARTER MOON 
    07  19:27  Moon at Apogee: 406230 km
    09  09:42  Moon at Ascending Node 
    10  03:42  Annular Solar Eclipse; mag=0.943
    10  03:53  NEW MOON 
    10  18     Mercury at Inferior Conjunction 
    11  23:44  Venus 1.5°S of Moon
    12  06     Venus at Perihelion 
    12  23:19  Pollux 3.1°N of Moon
    13  12:52  Mars 2.8°S of Moon
    13  23:47  Beehive 2.9°S of Moon
    15  16:28  Regulus 5.0°S of Moon
    17  20:54  FIRST QUARTER MOON 
    20  20:32  Summer Solstice 
    21  08:57  Venus 5.1°S of Pollux
    22  13:36  Mercury 1.8°N of Aldebaran
    22  20:26  Antares 4.8°S of Moon
    22  22:21  Mars 0.3°S of Beehive
    22  23:07  Moon at Descending Node 
    23  02:58  Moon at Perigee: 359960 km
    24  11:40  FULL MOON 
    27  02:30  Saturn 4.0°N of Moon
    28  11:38  Jupiter 4.5°N of Moon

Date     MST   Event
        (h:m)

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

Aug 01  07     Mercury at Superior Conjunction 
    01  22     Saturn at Opposition 
    02  00:35  Moon at Apogee: 404412 km
    02  19:51  Moon at Ascending Node 
    02  23:18  Aldebaran 5.7°S of Moon
    06  12:42  Pollux 3.1°N of Moon
    08  06:50  NEW MOON 
    11  00:00  Venus 4.3°S of Moon
    12  12     Perseid Meteor Shower
    13  02:31  Spica 6.1°S of Moon
    15  08:20  FIRST QUARTER MOON 
    16  09:04  Moon at Descending Node 
    16  11:34  Antares 4.5°S of Moon
    17  02:23  Moon at Perigee: 369127 km
    18  20     Mercury 0.1° of Mars
    19  16     Jupiter at Opposition 
    20  15:19  Saturn 3.7°N of Moon
    21  21:52  Jupiter 4.0°N of Moon
    22  05:02  FULL MOON 
    29  19:22  Moon at Apogee: 404100 km
    29  22:13  Moon at Ascending Node 
    30  00:13  LAST QUARTER MOON 

Sep 02  21:04  Pollux 3.0°N of Moon
    03  21:07  Beehive 2.9°S of Moon
    05  07:32  Venus 1.4°N of Spica
    05  17     Mercury at Aphelion 
    06  17:52  NEW MOON 
    09  09:01  Spica 5.9°S of Moon
    09  19:09  Venus 4.1°S of Moon
    11  03:05  Moon at Perigee: 368464 km
    12  09:35  Moon at Descending Node 
    12  16:59  Antares 4.2°S of Moon
    13  13:39  FIRST QUARTER MOON 
    13  21     Mercury at Greatest Elong: 26.8°E
    14  01     Neptune at Opposition 
    16  19:37  Saturn 3.8°N of Moon
    17  23:50  Jupiter 4.0°N of Moon
    20  16:55  FULL MOON 
    20  19:00  Mercury 1.2°S of Spica
    22  12:21  Autumnal Equinox 
    26  00:33  Moon at Ascending Node 
    26  14:44  Moon at Apogee: 404641 km
    28  18:57  LAST QUARTER MOON 
    30  05:44  Pollux 2.8°N of Moon

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

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

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