2023 Calendar of Astronomical Events




    


2023 Phases of the Moon

Alaska 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.

2023 Phases of the Moon
Alaska Standard Time
New Moon First Quarter Full Moon Last Quarter
-- Jan 6 14:08 Jan 14 17:10
Jan 21 11:53 Jan 28 06:19 Feb 5 09:29 Feb 13 07:01
Feb 19 22:06 Feb 26 23:06 Mar 7 03:40 Mar 14 17:08
Mar 21 08:23 Mar 28 17:32 Apr 5 19:35 Apr 13 00:11
Apr 19 19:12 H Apr 27 12:20 May 5 08:34 n May 12 05:28
May 19 06:53 May 27 06:22 Jun 3 18:42 Jun 10 10:31
Jun 17 19:37 Jun 25 22:50 Jul 3 02:39 Jul 9 16:48
Jul 17 09:32 Jul 25 13:07 Aug 1 09:31 Aug 8 01:28
Aug 16 00:38 Aug 24 00:57 Aug 30 16:35 Sep 6 13:21
Sep 14 16:40 Sep 22 10:32 Sep 29 00:57 Oct 6 04:48
Oct 14 08:55 A Oct 21 18:29 Oct 28 11:24 p Nov 4 23:37
Nov 13 00:27 Nov 20 01:50 Nov 27 00:16 Dec 4 20:49
Dec 12 14:32 Dec 19 09:39 Dec 26 15:33 -

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

Alaska 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.

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

Jan 01  06:25  Moon at Ascending Node 
    02  11     Mercury at Perihelion 
    02  16:24  Pleiades 2.6°N of Moon
    03  10:35  Mars 0.5°N of Moon: Occn.
    03  18     Quadrantid Meteor Shower
    04  07     Earth at Perihelion: 0.98329 AU
    06  14:08  FULL MOON 
    07  04     Mercury at Inferior Conjunction 
    07  04:40  Pollux 1.9°N of Moon
    08  00:19  Moon at Apogee: 406459 km
    08  06:23  Beehive 3.6°S of Moon
    10  02:38  Regulus 4.6°S of Moon
    14  12:59  Spica 3.9°S of Moon
    14  17:10  LAST QUARTER MOON 
    15  21:32  Moon at Descending Node 
    18  00:32  Antares 2.1°S of Moon
    21  11:53  NEW MOON 
    21  11:58  Moon at Perigee: 356570 km
    22  22:22  Saturn 3.8°N of Moon
    22  23:20  Venus 3.5°N of Moon
    24  23     Jupiter at Perihelion 
    25  17:00  Jupiter 1.8°N of Moon
    28  06:19  FIRST QUARTER MOON 
    28  07:05  Moon at Ascending Node 
    29  21     Mercury at Greatest Elong: 25.0°W
    29  22:21  Pleiades 2.4°N of Moon
    30  19:24  Mars 0.1°N of Moon: Occn.

Feb 03  10:47  Pollux 1.9°N of Moon
    03  23:55  Moon at Apogee: 406476 km
    04  12:32  Beehive 3.5°S of Moon
    05  09:29  FULL MOON 
    06  08:44  Regulus 4.5°S of Moon
    10  19:23  Spica 3.6°S of Moon
    11  22:31  Moon at Descending Node 
    13  07:01  LAST QUARTER MOON 
    14  09:09  Antares 1.9°S of Moon
    15  11     Mercury at Aphelion 
    16  07     Saturn in Conjunction with Sun 
    18  11:53  Mercury 3.6°N of Moon
    19  00:06  Moon at Perigee: 358267 km
    19  22:06  NEW MOON 
    21  22:57  Venus 2.1°N of Moon
    22  12:58  Jupiter 1.2°N of Moon: Occn.
    24  09:56  Moon at Ascending Node 
    26  05:42  Pleiades 2.1°N of Moon
    26  23:06  FIRST QUARTER MOON 
    27  19:32  Mars 1.1°S of Moon: Occn.

Mar 02  05     Mercury 0.9° of Saturn
    02  17:10  Pollux 1.7°N of Moon
    03  09:01  Moon at Apogee: 405890 km
    03  18:56  Beehive 3.6°S of Moon
    05  15:08  Regulus 4.5°S of Moon
    07  03:40  FULL MOON 
    10  01:06  Spica 3.4°S of Moon
    10  23:53  Moon at Descending Node 
    13  15:21  Antares 1.6°S of Moon
    14  17:08  LAST QUARTER MOON 
    15  14     Neptune in Conjunction with Sun 
    17  02     Mercury at Superior Conjunction 
    19  06:16  Moon at Perigee: 362698 km
    19  06:20  Saturn 3.6°N of Moon
    20  12:25  Vernal Equinox 
    21  08:23  NEW MOON 
    23  17:08  Moon at Ascending Node 
    24  01:28  Venus 0.1°N of Moon: Occn.
    25  14:42  Pleiades 1.9°N of Moon
    28  04:16  Mars 2.3°S of Moon
    28  17:32  FIRST QUARTER MOON 
    30  00:23  Pollux 1.6°N of Moon
    31  02:07  Beehive 3.8°S of Moon
    31  02:18  Moon at Apogee: 404921 km
    31  11     Mercury at Perihelion 

Apr 01  22:22  Regulus 4.6°S of Moon
    05  19:35  FULL MOON 
    06  07:45  Spica 3.3°S of Moon
    07  04:51  Moon at Descending Node 
    09  20:50  Antares 1.5°S of Moon
    10  19:42  Venus 2.5°S of Pleiades
    11  12     Jupiter in Conjunction with Sun 
    11  13     Mercury at Greatest Elong: 19.5°E
    13  00:11  LAST QUARTER MOON 
    15  17:22  Moon at Perigee: 367967 km
    15  18:47  Saturn 3.5°N of Moon
    17  07     Venus at Perihelion 
    19  00:08  Venus 7.3°N of Aldebaran
    19  19:12  NEW MOON 
    19  19:17  Hybrid Solar Eclipse; mag=1.013
    20  02:32  Moon at Ascending Node 
    22  00:14  Pleiades 1.9°N of Moon
    22  16     Lyrid Meteor Shower
    23  04:03  Venus 1.3°S of Moon
    25  17:18  Mars 3.2°S of Moon
    26  08:26  Pollux 1.5°N of Moon
    27  10:02  Beehive 3.8°S of Moon
    27  12:20  FIRST QUARTER MOON 
    27  21:43  Moon at Apogee: 404300 km
    29  06:21  Regulus 4.7°S of Moon

May 01  14     Mercury at Inferior Conjunction 
    03  15:55  Spica 3.3°S of Moon
    04  12:57  Moon at Descending Node 
    05  05     Eta-Aquarid Meteor Shower
    05  08:23  Pen. Lunar Eclipse; mag=0.964
    05  08:34  FULL MOON 
    07  03:35  Antares 1.5°S of Moon
    08  02:27  Mars 4.9°S of Pollux
    09  12     Uranus in Conjunction with Sun 
    10  19:57  Moon at Perigee: 369345 km
    12  05:28  LAST QUARTER MOON 
    13  04:04  Saturn 3.3°N of Moon
    17  04     Mercury 6.2° of Jupiter
    17  04:15  Jupiter 0.8°S of Moon: Occn.
    17  10:36  Moon at Ascending Node 
    17  16:34  Mercury 3.6°S of Moon
    19  06:53  NEW MOON 
    23  03:08  Venus 2.2°S of Moon
    23  16:37  Pollux 1.6°N of Moon
    24  08:32  Mars 3.8°S of Moon
    24  18:06  Beehive 3.8°S of Moon
    25  16:39  Moon at Apogee: 404510 km
    26  14:30  Regulus 4.6°S of Moon
    27  06:22  FIRST QUARTER MOON 
    28  20     Mercury at Greatest Elong: 24.9°W
    29  04:04  Venus 3.9°S of Pollux
    30  14     Mars at Aphelion 
    31  01:05  Spica 3.3°S of Moon
    31  21:22  Moon at Descending Node 

Jun 01  18:35  Mars 0.1°S of Beehive
    03  12:19  Antares 1.6°S of Moon
    03  18:42  FULL MOON 
    04  02     Venus at Greatest Elong: 45.4°E
    06  14:07  Moon at Perigee: 364860 km
    09  11:19  Saturn 3.0°N of Moon
    10  10:31  LAST QUARTER MOON 
    11  08:50  Mercury 5.9°S of Pleiades
    13  02:05  Venus 0.5°N of Beehive
    13  15:05  Moon at Ascending Node 
    13  21:33  Jupiter 1.5°S of Moon
    15  15:47  Pleiades 1.8°N of Moon
    16  11:16  Mercury 4.2°N of Aldebaran
    16  11:39  Mercury 4.3°S of Moon
    17  19:37  NEW MOON 
    20  00:10  Pollux 1.7°N of Moon
    21  01:38  Beehive 3.6°S of Moon
    21  05:58  Summer Solstice 
    21  15:47  Venus 3.7°S of Moon
    22  01:09  Mars 3.8°S of Moon
    22  09:30  Moon at Apogee: 405385 km
    22  22:08  Regulus 4.4°S of Moon
    25  22:50  FIRST QUARTER MOON 
    27  10     Mercury at Perihelion 
    27  10:08  Spica 3.1°S of Moon
    28  03:22  Moon at Descending Node 
    30  20     Mercury at Superior Conjunction 
    30  22:20  Antares 1.5°S of Moon

Date     AKST   Even
        (h:m)

Jul 03  02:39  FULL MOON 
    04  13:28  Moon at Perigee: 360151 km
    06  10     Earth at Aphelion: 1.01668 AU
    06  18:05  Saturn 2.7°N of Moon
    09  16:48  LAST QUARTER MOON 
    09  20:21  Mars 0.6°N of Regulus
    10  16:23  Moon at Ascending Node 
    11  12:18  Jupiter 2.2°S of Moon
    12  21:31  Pleiades 1.7°N of Moon
    14  13:33  Mercury 0.2°N of Beehive
    15  23:05  Venus 1.7°S of Regulus
    17  09:32  NEW MOON 
    18  23:56  Mercury 3.5°S of Moon
    19  21:56  Moon at Apogee: 406291 km
    20  04:53  Regulus 4.2°S of Moon
    20  19:00  Mars 3.3°S of Moon
    24  18:01  Spica 2.8°S of Moon
    25  06:05  Moon at Descending Node 
    25  13:07  FIRST QUARTER MOON 
    27  02     Mercury 5.1° of Venus
    28  07     Delta-Aquarid Meteor Shower
    28  08:11  Antares 1.3°S of Moon
    28  09:21  Mercury 0.1°S of Regulus

Aug 01  09:31  FULL MOON 
    01  20:52  Moon at Perigee: 357311 km
    03  01:21  Saturn 2.5°N of Moon
    06  17:46  Moon at Ascending Node 
    07  15     Venus at Aphelion 
    08  00:41  Jupiter 2.9°S of Moon
    08  01:28  LAST QUARTER MOON 
    09  03:16  Pleiades 1.5°N of Moon
    09  17     Mercury at Greatest Elong: 27.4°E
    10  09     Mercury at Aphelion 
    12  22     Perseid Meteor Shower
    12  23     Mercury 4.7° of Mars
    13  02     Venus at Inferior Conjunction 
    13  12:36  Pollux 1.7°N of Moon
    16  00:38  NEW MOON 
    16  02:55  Moon at Apogee: 406635 km
    18  14:06  Mars 2.2°S of Moon
    21  00:28  Spica 2.6°S of Moon
    21  07:23  Moon at Descending Node 
    24  00:57  FIRST QUARTER MOON 
    24  16:29  Antares 1.1°S of Moon
    26  23     Saturn at Opposition 
    30  06:51  Moon at Perigee: 357182 km
    30  09:03  Saturn 2.5°N of Moon
    30  16:35  FULL MOON 

Sep 02  22:44  Moon at Ascending Node 
    04  10:44  Jupiter 3.3°S of Moon
    05  10:25  Pleiades 1.2°N of Moon
    06  02     Mercury at Inferior Conjunction 
    06  13:21  LAST QUARTER MOON 
    09  18:32  Pollux 1.5°N of Moon
    10  20:15  Beehive 3.6°S of Moon
    12  06:42  Moon at Apogee: 406289 km
    12  17:00  Regulus 4.1°S of Moon
    14  16:40  NEW MOON 
    17  06:12  Spica 2.4°S of Moon
    17  10:18  Moon at Descending Node 
    19  01     Neptune at Opposition 
    20  22:50  Antares 0.9°S of Moon
    22  04     Mercury at Greatest Elong: 17.9°W
    22  10:32  FIRST QUARTER MOON 
    22  21:50  Autumnal Equinox 
    23  09     Mercury at Perihelion 
    26  16:25  Saturn 2.7°N of Moon
    27  16:05  Moon at Perigee: 359911 km
    29  00:57  FULL MOON 
    30  07:49  Moon at Ascending Node 

Oct 01  18:16  Jupiter 3.4°S of Moon
    02  19:25  Pleiades 1.1°N of Moon
    06  04:48  LAST QUARTER MOON 
    07  01:23  Pollux 1.4°N of Moon
    08  02:57  Beehive 3.7°S of Moon
    08  21:08  Venus 2.3°S of Regulus
    09  18:41  Moon at Apogee: 405426 km
    09  23:41  Regulus 4.2°S of Moon
    14  08:55  NEW MOON 
    14  08:59  Annular Solar Eclipse; mag=0.952
    14  16:11  Moon at Descending Node 
    18  04:17  Antares 0.9°S of Moon
    19  20     Mercury at Superior Conjunction 
    21  15     Orionid Meteor Shower
    21  18:29  FIRST QUARTER MOON 
    23  13     Venus at Greatest Elong: 46.4°W
    23  22:52  Saturn 2.8°N of Moon
    25  17:53  Moon at Perigee: 364873 km
    27  18:14  Moon at Ascending Node 
    28  11:14  Partial Lunar Eclipse; mag=0.122
    28  11:24  FULL MOON 
    28  23:10  Jupiter 3.1°S of Moon
    30  05:30  Pleiades 1.1°N of Moon

Nov 02  19     Jupiter at Opposition 
    03  09:31  Pollux 1.4°N of Moon
    04  10:46  Beehive 3.7°S of Moon
    04  23:37  LAST QUARTER MOON 
    05  15     S Taurid Meteor Shower
    06  07:19  Regulus 4.2°S of Moon
    06  12:49  Moon at Apogee: 404569 km
    09  00:28  Venus 1.0°S of Moon: Occn.
    10  20:09  Spica 2.4°S of Moon
    10  23:49  Moon at Descending Node 
    12  15     N Taurid Meteor Shower
    13  00:27  NEW MOON 
    13  09     Uranus at Opposition 
    16  12:17  Mercury 2.5°N of Antares
    17  20     Mars in Conjunction with Sun 
    17  21     Leonid Meteor Shower
    20  01:50  FIRST QUARTER MOON 
    20  05:02  Saturn 2.7°N of Moon
    21  12:03  Moon at Perigee: 369824 km
    24  02:02  Moon at Ascending Node 
    25  02:10  Jupiter 2.8°S of Moon
    26  15:02  Pleiades 1.1°N of Moon
    27  00:16  FULL MOON 
    28  00     Venus at Perihelion 
    29  01:27  Venus 3.9°N of Spica
    30  18:23  Pollux 1.6°N of Moon

Dec 01  19:21  Beehive 3.6°S of Moon
    03  15:38  Regulus 4.0°S of Moon
    04  05     Mercury at Greatest Elong: 21.3°E
    04  09:42  Moon at Apogee: 404348 km
    04  20:49  LAST QUARTER MOON 
    08  05:05  Spica 2.3°S of Moon
    08  06:24  Moon at Descending Node 
    09  07:53  Venus 3.6°N of Moon
    12  14:32  NEW MOON 
    13  20:18  Mercury 4.4°N of Moon
    14  10     Geminid Meteor Shower
    16  09:53  Moon at Perigee: 367900 km
    17  12:58  Saturn 2.5°N of Moon
    19  09:39  FIRST QUARTER MOON 
    20  08     Mercury at Perihelion 
    21  04:54  Moon at Ascending Node 
    21  18:28  Winter Solstice 
    22  05:20  Jupiter 2.6°S of Moon
    22  10     Mercury at Inferior Conjunction 
    22  18     Ursid Meteor Shower
    23  22:37  Pleiades 1.1°N of Moon
    26  15:33  FULL MOON 
    28  02:51  Pollux 1.7°N of Moon
    29  03:45  Beehive 3.4°S of Moon
    30  23:52  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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