2021 Calendar of Astronomical Events




    


2021 Phases of the Moon

Hawaiian 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
Hawaiian Standard Time
New Moon First Quarter Full Moon Last Quarter
--- Jan 5 23:37
Jan 12 19:00 Jan 20 11:02 Jan 28 09:16 Feb 4 07:37
Feb 11 09:06 Feb 19 08:47 Feb 26 22:17 Mar 5 15:30
Mar 13 00:21 Mar 21 04:40 Mar 28 08:48 Apr 4 00:02
Apr 11 16:31 Apr 19 20:59 Apr 26 17:31 May 3 09:50
May 11 09:00 May 19 09:13 May 26 01:14 t Jun 1 21:24
Jun 10 00:53 A Jun 17 17:54 Jun 24 08:40 Jul 1 11:11
Jul 9 15:17 Jul 17 00:11 Jul 23 16:37 Jul 31 03:16
Aug 8 03:50 Aug 15 05:20 Aug 22 02:02 Aug 29 21:13
Sep 6 14:52 Sep 13 10:39 Sep 20 13:55 Sep 28 15:57
Oct 6 01:05 Oct 12 17:25 Oct 20 04:57 Oct 28 10:05
Nov 4 11:15 Nov 11 02:46 Nov 18 22:58 p Nov 27 02:28
Dec 3 21:43 T Dec 10 15:36 Dec 18 18:36 Dec 26 16:24

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

Hawaiian 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     HST   Event
        (h:m)

Jan 02  04     Earth at Perihelion: 0.98325 AU
    02  11:58  Regulus 4.7°S of Moon
    03  05     Quadrantid Meteor Shower
    05  23:37  LAST QUARTER MOON 
    09  05:39  Moon at Perigee: 367390 km
    09  16:08  Antares 5.6°S of Moon
    09  19     Mercury 1.6° of Saturn
    10  10:14  Moon at Descending Node 
    11  08     Mercury 1.4° of Jupiter
    11  10:12  Venus 1.5°N of Moon
    12  19:00  NEW MOON 
    13  22:15  Mercury 2.3°N of Moon
    20  11:02  FIRST QUARTER MOON 
    20  19:37  Mars 5.1°N of Moon
    21  03:11  Moon at Apogee: 404361 km
    23  16     Mercury at Greatest Elong: 18.6°E
    23  16     Saturn in Conjunction with Sun 
    23  18:39  Aldebaran 4.7°S of Moon
    24  11:47  Moon at Ascending Node 
    27  05:46  Pollux 3.8°N of Moon
    28  04:50  Beehive 2.3°S of Moon
    28  09:16  FULL MOON 
    28  15     Jupiter in Conjunction with Sun 
    28  16     Mercury at Perihelion 
    29  18:56  Regulus 4.6°S of Moon

Feb 03  09:33  Moon at Perigee: 370127 km
    04  07:37  LAST QUARTER MOON 
    05  22:33  Antares 5.5°S of Moon
    06  14:29  Moon at Descending Node 
    08  04     Mercury at Inferior Conjunction 
    11  09:06  NEW MOON 
    15  04     Mercury 3.8° of Jupiter
    18  00:22  Moon at Apogee: 404467 km
    18  12:47  Mars 3.7°N of Moon
    19  08:47  FIRST QUARTER MOON 
    19  19     Venus at Aphelion 
    20  03:15  Aldebaran 5.0°S of Moon
    20  15:44  Moon at Ascending Node 
    22  22     Mercury 4.0° of Saturn
    23  15:10  Pollux 3.7°N of Moon
    24  14:16  Beehive 2.4°S of Moon
    26  04:04  Regulus 4.6°S of Moon
    26  22:17  FULL MOON 

Mar 01  19:19  Moon at Perigee: 365422 km
    03  13:36  Mars 2.6°S of Pleiades
    04  19     Mercury 0.3° of Jupiter
    05  03:58  Antares 5.2°S of Moon
    05  14:56  Moon at Descending Node 
    05  15:30  LAST QUARTER MOON 
    06  01     Mercury at Greatest Elong: 27.3°W
    09  13:02  Saturn 3.7°N of Moon
    10  05:35  Jupiter 4.0°N of Moon
    10  14     Neptune in Conjunction with Sun 
    10  15:02  Mercury 3.7°N of Moon
    13  00:21  NEW MOON 
    13  16     Mercury at Aphelion 
    17  19:04  Moon at Apogee: 405253 km
    19  07:48  Mars 1.9°N of Moon
    19  11:13  Aldebaran 5.2°S of Moon
    19  17:31  Moon at Ascending Node 
    19  23:37  Vernal Equinox 
    20  09:15  Mars 6.9°N of Aldebaran
    21  04:40  FIRST QUARTER MOON 
    23  00:26  Pollux 3.5°N of Moon
    23  23:58  Beehive 2.6°S of Moon
    25  14:17  Regulus 4.7°S of Moon
    25  20     Venus at Superior Conjunction 
    28  08:48  FULL MOON 
    29  05:52  Spica 6.5°S of Moon
    29  20:12  Moon at Perigee: 360311 km

Apr 01  10:49  Antares 4.9°S of Moon
    01  16:41  Moon at Descending Node 
    04  00:02  LAST QUARTER MOON 
    05  22:34  Saturn 4.0°N of Moon
    06  21:15  Jupiter 4.4°N of Moon
    11  16:31  NEW MOON 
    14  07:47  Moon at Apogee: 406120 km
    15  18:07  Aldebaran 5.4°S of Moon
    15  19:53  Moon at Ascending Node 
    17  02:09  Mars 0.1°N of Moon: Occn.
    18  16     Mercury at Superior Conjunction 
    19  08:18  Pollux 3.2°N of Moon
    19  20:59  FIRST QUARTER MOON 
    20  08:25  Beehive 2.8°S of Moon
    21  23:48  Regulus 4.9°S of Moon
    22  02     Lyrid Meteor Shower
    25  16:43  Spica 6.5°S of Moon
    26  15     Mercury at Perihelion 
    26  17:31  FULL MOON 
    27  05:24  Moon at Perigee: 357379 km
    28  20:07  Antares 4.8°S of Moon
    28  23:17  Moon at Descending Node 
    30  11     Uranus in Conjunction with Sun 

May 03  07:02  Saturn 4.2°N of Moon
    03  09:50  LAST QUARTER MOON 
    03  17:03  Mercury 2.1°S of Pleiades
    04  11:00  Jupiter 4.6°N of Moon
    04  15     Eta-Aquarid Meteor Shower
    11  09:00  NEW MOON 
    11  11:54  Moon at Apogee: 406512 km
    13  00:29  Moon at Ascending Node 
    13  07:59  Mercury 2.1°N of Moon
    15  18:47  Mars 1.5°S of Moon
    16  14:39  Pollux 3.1°N of Moon
    16  20     Mercury at Greatest Elong: 22.0°E
    17  15:08  Beehive 2.9°S of Moon
    19  07:28  Regulus 5.0°S of Moon
    19  09:13  FIRST QUARTER MOON 
    23  03:07  Spica 6.5°S of Moon
    25  15:52  Moon at Perigee: 357310 km
    26  01:14  FULL MOON 
    26  01:19  Total Lunar Eclipse; mag=1.009
    26  06:55  Antares 4.8°S of Moon
    26  09:38  Moon at Descending Node 
    28  17     Mercury 0.4° of Venus
    30  15:22  Saturn 4.2°N of Moon
    31  01:41  Mars 5.2°S of Pollux
    31  22:57  Jupiter 4.6°N of Moon

Jun 01  21:24  LAST QUARTER MOON 
    07  16:27  Moon at Apogee: 406230 km
    09  06:42  Moon at Ascending Node 
    10  00:42  Annular Solar Eclipse; mag=0.943
    10  00:53  NEW MOON 
    10  15     Mercury at Inferior Conjunction 
    11  20:44  Venus 1.5°S of Moon
    12  03     Venus at Perihelion 
    12  20:19  Pollux 3.1°N of Moon
    13  09:52  Mars 2.8°S of Moon
    13  20:47  Beehive 2.9°S of Moon
    15  13:28  Regulus 5.0°S of Moon
    17  17:54  FIRST QUARTER MOON 
    20  17:32  Summer Solstice 
    21  05:57  Venus 5.1°S of Pollux
    22  10:36  Mercury 1.8°N of Aldebaran
    22  17:26  Antares 4.8°S of Moon
    22  19:21  Mars 0.3°S of Beehive
    22  20:07  Moon at Descending Node 
    22  23:58  Moon at Perigee: 359960 km
    24  08:40  FULL MOON 
    26  23:30  Saturn 4.0°N of Moon
    28  08:38  Jupiter 4.5°N of Moon

Date     HST   Event
        (h:m)

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

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

Sep 02  18:04  Pollux 3.0°N of Moon
    03  18:07  Beehive 2.9°S of Moon
    05  04:32  Venus 1.4°N of Spica
    05  14     Mercury at Aphelion 
    06  14:52  NEW MOON 
    09  06:01  Spica 5.9°S of Moon
    09  16:09  Venus 4.1°S of Moon
    11  00:05  Moon at Perigee: 368464 km
    12  06:35  Moon at Descending Node 
    12  13:59  Antares 4.2°S of Moon
    13  10:39  FIRST QUARTER MOON 
    13  18     Mercury at Greatest Elong: 26.8°E
    13  22     Neptune at Opposition 
    16  16:37  Saturn 3.8°N of Moon
    17  20:50  Jupiter 4.0°N of Moon
    20  13:55  FULL MOON 
    20  16:00  Mercury 1.2°S of Spica
    22  09:21  Autumnal Equinox 
    25  21:33  Moon at Ascending Node 
    26  11:44  Moon at Apogee: 404641 km
    28  15:57  LAST QUARTER MOON 
    30  02:44  Pollux 2.8°N of Moon

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

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

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