2023 Calendar of Astronomical Events




    


2023 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.

2023 Phases of the Moon
Greenwich Mean Time
New Moon First Quarter Full Moon Last Quarter
-- Jan 6 23:08 Jan 15 02:10
Jan 21 20:53 Jan 28 15:19 Feb 5 18:29 Feb 13 16:01
Feb 20 07:06 Feb 27 08:06 Mar 7 12:40 Mar 15 02:08
Mar 21 17:23 Mar 29 02:32 Apr 6 04:35 Apr 13 09:11
Apr 20 04:12 H Apr 27 21:20 May 5 17:34 n May 12 14:28
May 19 15:53 May 27 15:22 Jun 4 03:42 Jun 10 19:31
Jun 18 04:37 Jun 26 07:50 Jul 3 11:39 Jul 10 01:48
Jul 17 18:32 Jul 25 22:07 Aug 1 18:31 Aug 8 10:28
Aug 16 09:38 Aug 24 09:57 Aug 31 01:35 Sep 6 22:21
Sep 15 01:40 Sep 22 19:32 Sep 29 09:57 Oct 6 13:48
Oct 14 17:55 A Oct 22 03:29 Oct 28 20:24 p Nov 5 08:37
Nov 13 09:27 Nov 20 10:50 Nov 27 09:16 Dec 5 05:49
Dec 12 23:32 Dec 19 18:39 Dec 27 00:33 -

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.



2023 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.

2023 Calendar of Astronomical Events
January - June July - December
Date     GMT   Event
        (h:m)

Jan 01  15:25  Moon at Ascending Node 
    02  20     Mercury at Perihelion 
    03  01:24  Pleiades 2.6°N of Moon
    03  19:35  Mars 0.5°N of Moon: Occn.
    04  03     Quadrantid Meteor Shower
    04  16     Earth at Perihelion: 0.98329 AU
    06  23:08  FULL MOON 
    07  13     Mercury at Inferior Conjunction 
    07  13:40  Pollux 1.9°N of Moon
    08  09:19  Moon at Apogee: 406459 km
    08  15:23  Beehive 3.6°S of Moon
    10  11:38  Regulus 4.6°S of Moon
    14  21:59  Spica 3.9°S of Moon
    15  02:10  LAST QUARTER MOON 
    16  06:32  Moon at Descending Node 
    18  09:32  Antares 2.1°S of Moon
    21  20:53  NEW MOON 
    21  20:58  Moon at Perigee: 356570 km
    23  07:22  Saturn 3.8°N of Moon
    23  08:20  Venus 3.5°N of Moon
    25  08     Jupiter at Perihelion 
    26  02:00  Jupiter 1.8°N of Moon
    28  15:19  FIRST QUARTER MOON 
    28  16:05  Moon at Ascending Node 
    30  06     Mercury at Greatest Elong: 25.0°W
    30  07:21  Pleiades 2.4°N of Moon
    31  04:24  Mars 0.1°N of Moon: Occn.

Feb 03  19:47  Pollux 1.9°N of Moon
    04  08:55  Moon at Apogee: 406476 km
    04  21:32  Beehive 3.5°S of Moon
    05  18:29  FULL MOON 
    06  17:44  Regulus 4.5°S of Moon
    11  04:23  Spica 3.6°S of Moon
    12  07:31  Moon at Descending Node 
    13  16:01  LAST QUARTER MOON 
    14  18:09  Antares 1.9°S of Moon
    15  20     Mercury at Aphelion 
    16  16     Saturn in Conjunction with Sun 
    18  20:53  Mercury 3.6°N of Moon
    19  09:06  Moon at Perigee: 358267 km
    20  07:06  NEW MOON 
    22  07:57  Venus 2.1°N of Moon
    22  21:58  Jupiter 1.2°N of Moon: Occn.
    24  18:56  Moon at Ascending Node 
    26  14:42  Pleiades 2.1°N of Moon
    27  08:06  FIRST QUARTER MOON 
    28  04:32  Mars 1.1°S of Moon: Occn.

Mar 02  14     Mercury 0.9° of Saturn
    03  02:10  Pollux 1.7°N of Moon
    03  18:01  Moon at Apogee: 405890 km
    04  03:56  Beehive 3.6°S of Moon
    06  00:08  Regulus 4.5°S of Moon
    07  12:40  FULL MOON 
    10  10:06  Spica 3.4°S of Moon
    11  08:53  Moon at Descending Node 
    14  00:21  Antares 1.6°S of Moon
    15  02:08  LAST QUARTER MOON 
    15  23     Neptune in Conjunction with Sun 
    17  11     Mercury at Superior Conjunction 
    19  15:16  Moon at Perigee: 362698 km
    19  15:20  Saturn 3.6°N of Moon
    20  21:25  Vernal Equinox 
    21  17:23  NEW MOON 
    24  02:08  Moon at Ascending Node 
    24  10:28  Venus 0.1°N of Moon: Occn.
    25  23:42  Pleiades 1.9°N of Moon
    28  13:16  Mars 2.3°S of Moon
    29  02:32  FIRST QUARTER MOON 
    30  09:23  Pollux 1.6°N of Moon
    31  11:07  Beehive 3.8°S of Moon
    31  11:18  Moon at Apogee: 404921 km
    31  20     Mercury at Perihelion 

Apr 02  07:22  Regulus 4.6°S of Moon
    06  04:35  FULL MOON 
    06  16:45  Spica 3.3°S of Moon
    07  13:51  Moon at Descending Node 
    10  05:50  Antares 1.5°S of Moon
    11  04:42  Venus 2.5°S of Pleiades
    11  21     Jupiter in Conjunction with Sun 
    11  22     Mercury at Greatest Elong: 19.5°E
    13  09:11  LAST QUARTER MOON 
    16  02:22  Moon at Perigee: 367967 km
    16  03:47  Saturn 3.5°N of Moon
    17  16     Venus at Perihelion 
    19  09:08  Venus 7.3°N of Aldebaran
    20  04:12  NEW MOON 
    20  04:17  Hybrid Solar Eclipse; mag=1.013
    20  11:32  Moon at Ascending Node 
    22  09:14  Pleiades 1.9°N of Moon
    23  01     Lyrid Meteor Shower
    23  13:03  Venus 1.3°S of Moon
    26  02:18  Mars 3.2°S of Moon
    26  17:26  Pollux 1.5°N of Moon
    27  19:02  Beehive 3.8°S of Moon
    27  21:20  FIRST QUARTER MOON 
    28  06:43  Moon at Apogee: 404300 km
    29  15:21  Regulus 4.7°S of Moon

May 01  23     Mercury at Inferior Conjunction 
    04  00:55  Spica 3.3°S of Moon
    04  21:57  Moon at Descending Node 
    05  14     Eta-Aquarid Meteor Shower
    05  17:23  Pen. Lunar Eclipse; mag=0.964
    05  17:34  FULL MOON 
    07  12:35  Antares 1.5°S of Moon
    08  11:27  Mars 4.9°S of Pollux
    09  21     Uranus in Conjunction with Sun 
    11  04:57  Moon at Perigee: 369345 km
    12  14:28  LAST QUARTER MOON 
    13  13:04  Saturn 3.3°N of Moon
    17  13     Mercury 6.2° of Jupiter
    17  13:15  Jupiter 0.8°S of Moon: Occn.
    17  19:36  Moon at Ascending Node 
    18  01:34  Mercury 3.6°S of Moon
    19  15:53  NEW MOON 
    23  12:08  Venus 2.2°S of Moon
    24  01:37  Pollux 1.6°N of Moon
    24  17:32  Mars 3.8°S of Moon
    25  03:06  Beehive 3.8°S of Moon
    26  01:39  Moon at Apogee: 404510 km
    26  23:30  Regulus 4.6°S of Moon
    27  15:22  FIRST QUARTER MOON 
    29  05     Mercury at Greatest Elong: 24.9°W
    29  13:04  Venus 3.9°S of Pollux
    30  23     Mars at Aphelion 
    31  10:05  Spica 3.3°S of Moon

Jun 01  06:22  Moon at Descending Node 
    02  03:35  Mars 0.1°S of Beehive
    03  21:19  Antares 1.6°S of Moon
    04  03:42  FULL MOON 
    04  11     Venus at Greatest Elong: 45.4°E
    06  23:07  Moon at Perigee: 364860 km
    09  20:19  Saturn 3.0°N of Moon
    10  19:31  LAST QUARTER MOON 
    11  17:50  Mercury 5.9°S of Pleiades
    13  11:05  Venus 0.5°N of Beehive
    14  00:05  Moon at Ascending Node 
    14  06:33  Jupiter 1.5°S of Moon
    16  00:47  Pleiades 1.8°N of Moon
    16  20:16  Mercury 4.2°N of Aldebaran
    16  20:39  Mercury 4.3°S of Moon
    18  04:37  NEW MOON 
    20  09:10  Pollux 1.7°N of Moon
    21  10:38  Beehive 3.6°S of Moon
    21  14:58  Summer Solstice 
    22  00:47  Venus 3.7°S of Moon
    22  10:09  Mars 3.8°S of Moon
    22  18:30  Moon at Apogee: 405385 km
    23  07:08  Regulus 4.4°S of Moon
    26  07:50  FIRST QUARTER MOON 
    27  19     Mercury at Perihelion 
    27  19:08  Spica 3.1°S of Moon
    28  12:22  Moon at Descending Node 

Date     GMT   Event
        (h:m)

Jul 01  05     Mercury at Superior Conjunction 
    01  07:20  Antares 1.5°S of Moon
    03  11:39  FULL MOON 
    04  22:28  Moon at Perigee: 360151 km
    06  19     Earth at Aphelion: 1.01668 AU
    07  03:05  Saturn 2.7°N of Moon
    10  01:48  LAST QUARTER MOON 
    10  05:21  Mars 0.6°N of Regulus
    11  01:23  Moon at Ascending Node 
    11  21:18  Jupiter 2.2°S of Moon
    13  06:31  Pleiades 1.7°N of Moon
    14  22:33  Mercury 0.2°N of Beehive
    16  08:05  Venus 1.7°S of Regulus
    17  18:32  NEW MOON 
    19  08:56  Mercury 3.5°S of Moon
    20  06:56  Moon at Apogee: 406291 km
    20  13:53  Regulus 4.2°S of Moon
    21  04:00  Mars 3.3°S of Moon
    25  03:01  Spica 2.8°S of Moon
    25  15:05  Moon at Descending Node 
    25  22:07  FIRST QUARTER MOON 
    27  11     Mercury 5.1° of Venus
    28  16     Delta-Aquarid Meteor Shower
    28  17:11  Antares 1.3°S of Moon
    28  18:21  Mercury 0.1°S of Regulus

Aug 01  18:31  FULL MOON 
    02  05:52  Moon at Perigee: 357311 km
    03  10:21  Saturn 2.5°N of Moon
    07  02:46  Moon at Ascending Node 
    08  00     Venus at Aphelion 
    08  09:41  Jupiter 2.9°S of Moon
    08  10:28  LAST QUARTER MOON 
    09  12:16  Pleiades 1.5°N of Moon
    10  02     Mercury at Greatest Elong: 27.4°E
    10  18     Mercury at Aphelion 
    13  07     Perseid Meteor Shower
    13  08     Mercury 4.7° of Mars
    13  11     Venus at Inferior Conjunction 
    13  21:36  Pollux 1.7°N of Moon
    16  09:38  NEW MOON 
    16  11:55  Moon at Apogee: 406635 km
    18  23:06  Mars 2.2°S of Moon
    21  09:28  Spica 2.6°S of Moon
    21  16:23  Moon at Descending Node 
    24  09:57  FIRST QUARTER MOON 
    25  01:29  Antares 1.1°S of Moon
    27  08     Saturn at Opposition 
    30  15:51  Moon at Perigee: 357182 km
    30  18:03  Saturn 2.5°N of Moon
    31  01:35  FULL MOON 

Sep 03  07:44  Moon at Ascending Node 
    04  19:44  Jupiter 3.3°S of Moon
    05  19:25  Pleiades 1.2°N of Moon
    06  11     Mercury at Inferior Conjunction 
    06  22:21  LAST QUARTER MOON 
    10  03:32  Pollux 1.5°N of Moon
    11  05:15  Beehive 3.6°S of Moon
    12  15:42  Moon at Apogee: 406289 km
    13  02:00  Regulus 4.1°S of Moon
    15  01:40  NEW MOON 
    17  15:12  Spica 2.4°S of Moon
    17  19:18  Moon at Descending Node 
    19  10     Neptune at Opposition 
    21  07:50  Antares 0.9°S of Moon
    22  13     Mercury at Greatest Elong: 17.9°W
    22  19:32  FIRST QUARTER MOON 
    23  06:50  Autumnal Equinox 
    23  18     Mercury at Perihelion 
    27  01:25  Saturn 2.7°N of Moon
    28  01:05  Moon at Perigee: 359911 km
    29  09:57  FULL MOON 
    30  16:49  Moon at Ascending Node 

Oct 02  03:16  Jupiter 3.4°S of Moon
    03  04:25  Pleiades 1.1°N of Moon
    06  13:48  LAST QUARTER MOON 
    07  10:23  Pollux 1.4°N of Moon
    08  11:57  Beehive 3.7°S of Moon
    09  06:08  Venus 2.3°S of Regulus
    10  03:41  Moon at Apogee: 405426 km
    10  08:41  Regulus 4.2°S of Moon
    14  17:55  NEW MOON 
    14  17:59  Annular Solar Eclipse; mag=0.952
    15  01:11  Moon at Descending Node 
    18  13:17  Antares 0.9°S of Moon
    20  05     Mercury at Superior Conjunction 
    22  00     Orionid Meteor Shower
    22  03:29  FIRST QUARTER MOON 
    23  22     Venus at Greatest Elong: 46.4°W
    24  07:52  Saturn 2.8°N of Moon
    26  02:53  Moon at Perigee: 364873 km
    28  03:14  Moon at Ascending Node 
    28  20:14  Partial Lunar Eclipse; mag=0.122
    28  20:24  FULL MOON 
    29  08:10  Jupiter 3.1°S of Moon
    30  14:30  Pleiades 1.1°N of Moon

Nov 03  04     Jupiter at Opposition 
    03  18:31  Pollux 1.4°N of Moon
    04  19:46  Beehive 3.7°S of Moon
    05  08:37  LAST QUARTER MOON 
    06  00     S Taurid Meteor Shower
    06  16:19  Regulus 4.2°S of Moon
    06  21:49  Moon at Apogee: 404569 km
    09  09:28  Venus 1.0°S of Moon: Occn.
    11  05:09  Spica 2.4°S of Moon
    11  08:49  Moon at Descending Node 
    13  00     N Taurid Meteor Shower
    13  09:27  NEW MOON 
    13  18     Uranus at Opposition 
    16  21:17  Mercury 2.5°N of Antares
    18  05     Mars in Conjunction with Sun 
    18  06     Leonid Meteor Shower
    20  10:50  FIRST QUARTER MOON 
    20  14:02  Saturn 2.7°N of Moon
    21  21:03  Moon at Perigee: 369824 km
    24  11:02  Moon at Ascending Node 
    25  11:10  Jupiter 2.8°S of Moon
    27  00:02  Pleiades 1.1°N of Moon
    27  09:16  FULL MOON 
    28  09     Venus at Perihelion 
    29  10:27  Venus 3.9°N of Spica

Dec 01  03:23  Pollux 1.6°N of Moon
    02  04:21  Beehive 3.6°S of Moon
    04  00:38  Regulus 4.0°S of Moon
    04  14     Mercury at Greatest Elong: 21.3°E
    04  18:42  Moon at Apogee: 404348 km
    05  05:49  LAST QUARTER MOON 
    08  14:05  Spica 2.3°S of Moon
    08  15:24  Moon at Descending Node 
    09  16:53  Venus 3.6°N of Moon
    12  23:32  NEW MOON 
    14  05:18  Mercury 4.4°N of Moon
    14  19     Geminid Meteor Shower
    16  18:53  Moon at Perigee: 367900 km
    17  21:58  Saturn 2.5°N of Moon
    19  18:39  FIRST QUARTER MOON 
    20  17     Mercury at Perihelion 
    21  13:54  Moon at Ascending Node 
    22  03:28  Winter Solstice 
    22  14:20  Jupiter 2.6°S of Moon
    22  19     Mercury at Inferior Conjunction 
    23  03     Ursid Meteor Shower
    24  07:37  Pleiades 1.1°N of Moon
    27  00:33  FULL MOON 
    28  11:51  Pollux 1.7°N of Moon
    29  12:45  Beehive 3.4°S of Moon
    31  08:52  Regulus 3.8°S of Moon

    

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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