2023 Calendar of Astronomical Events




    


2023 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.

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

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

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.

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

Jan 01  07:25  Moon at Ascending Node 
    02  12     Mercury at Perihelion 
    02  17:24  Pleiades 2.6°N of Moon
    03  11:35  Mars 0.5°N of Moon: Occn.
    03  19     Quadrantid Meteor Shower
    04  08     Earth at Perihelion: 0.98329 AU
    06  15:08  FULL MOON 
    07  05     Mercury at Inferior Conjunction 
    07  05:40  Pollux 1.9°N of Moon
    08  01:19  Moon at Apogee: 406459 km
    08  07:23  Beehive 3.6°S of Moon
    10  03:38  Regulus 4.6°S of Moon
    14  13:59  Spica 3.9°S of Moon
    14  18:10  LAST QUARTER MOON 
    15  22:32  Moon at Descending Node 
    18  01:32  Antares 2.1°S of Moon
    21  12:53  NEW MOON 
    21  12:58  Moon at Perigee: 356570 km
    22  23:22  Saturn 3.8°N of Moon
    23  00:20  Venus 3.5°N of Moon
    25  00     Jupiter at Perihelion 
    25  18:00  Jupiter 1.8°N of Moon
    28  07:19  FIRST QUARTER MOON 
    28  08:05  Moon at Ascending Node 
    29  22     Mercury at Greatest Elong: 25.0°W
    29  23:21  Pleiades 2.4°N of Moon
    30  20:24  Mars 0.1°N of Moon: Occn.

Feb 03  11:47  Pollux 1.9°N of Moon
    04  00:55  Moon at Apogee: 406476 km
    04  13:32  Beehive 3.5°S of Moon
    05  10:29  FULL MOON 
    06  09:44  Regulus 4.5°S of Moon
    10  20:23  Spica 3.6°S of Moon
    11  23:31  Moon at Descending Node 
    13  08:01  LAST QUARTER MOON 
    14  10:09  Antares 1.9°S of Moon
    15  12     Mercury at Aphelion 
    16  08     Saturn in Conjunction with Sun 
    18  12:53  Mercury 3.6°N of Moon
    19  01:06  Moon at Perigee: 358267 km
    19  23:06  NEW MOON 
    21  23:57  Venus 2.1°N of Moon
    22  13:58  Jupiter 1.2°N of Moon: Occn.
    24  10:56  Moon at Ascending Node 
    26  06:42  Pleiades 2.1°N of Moon
    27  00:06  FIRST QUARTER MOON 
    27  20:32  Mars 1.1°S of Moon: Occn.

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

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

May 01  15     Mercury at Inferior Conjunction 
    03  16:55  Spica 3.3°S of Moon
    04  13:57  Moon at Descending Node 
    05  06     Eta-Aquarid Meteor Shower
    05  09:23  Pen. Lunar Eclipse; mag=0.964
    05  09:34  FULL MOON 
    07  04:35  Antares 1.5°S of Moon
    08  03:27  Mars 4.9°S of Pollux
    09  13     Uranus in Conjunction with Sun 
    10  20:57  Moon at Perigee: 369345 km
    12  06:28  LAST QUARTER MOON 
    13  05:04  Saturn 3.3°N of Moon
    17  05     Mercury 6.2° of Jupiter
    17  05:15  Jupiter 0.8°S of Moon: Occn.
    17  11:36  Moon at Ascending Node 
    17  17:34  Mercury 3.6°S of Moon
    19  07:53  NEW MOON 
    23  04:08  Venus 2.2°S of Moon
    23  17:37  Pollux 1.6°N of Moon
    24  09:32  Mars 3.8°S of Moon
    24  19:06  Beehive 3.8°S of Moon
    25  17:39  Moon at Apogee: 404510 km
    26  15:30  Regulus 4.6°S of Moon
    27  07:22  FIRST QUARTER MOON 
    28  21     Mercury at Greatest Elong: 24.9°W
    29  05:04  Venus 3.9°S of Pollux
    30  15     Mars at Aphelion 
    31  02:05  Spica 3.3°S of Moon
    31  22:22  Moon at Descending Node 

Jun 01  19:35  Mars 0.1°S of Beehive
    03  13:19  Antares 1.6°S of Moon
    03  19:42  FULL MOON 
    04  03     Venus at Greatest Elong: 45.4°E
    06  15:07  Moon at Perigee: 364860 km
    09  12:19  Saturn 3.0°N of Moon
    10  11:31  LAST QUARTER MOON 
    11  09:50  Mercury 5.9°S of Pleiades
    13  03:05  Venus 0.5°N of Beehive
    13  16:05  Moon at Ascending Node 
    13  22:33  Jupiter 1.5°S of Moon
    15  16:47  Pleiades 1.8°N of Moon
    16  12:16  Mercury 4.2°N of Aldebaran
    16  12:39  Mercury 4.3°S of Moon
    17  20:37  NEW MOON 
    20  01:10  Pollux 1.7°N of Moon
    21  02:38  Beehive 3.6°S of Moon
    21  06:58  Summer Solstice 
    21  16:47  Venus 3.7°S of Moon
    22  02:09  Mars 3.8°S of Moon
    22  10:30  Moon at Apogee: 405385 km
    22  23:08  Regulus 4.4°S of Moon
    25  23:50  FIRST QUARTER MOON 
    27  11     Mercury at Perihelion 
    27  11:08  Spica 3.1°S of Moon
    28  04:22  Moon at Descending Node 
    30  21     Mercury at Superior Conjunction 
    30  23:20  Antares 1.5°S of Moon

Date     PST   Event
        (h:m)

Jul 03  03:39  FULL MOON 
    04  14:28  Moon at Perigee: 360151 km
    06  11     Earth at Aphelion: 1.01668 AU
    06  19:05  Saturn 2.7°N of Moon
    09  17:48  LAST QUARTER MOON 
    09  21:21  Mars 0.6°N of Regulus
    10  17:23  Moon at Ascending Node 
    11  13:18  Jupiter 2.2°S of Moon
    12  22:31  Pleiades 1.7°N of Moon
    14  14:33  Mercury 0.2°N of Beehive
    16  00:05  Venus 1.7°S of Regulus
    17  10:32  NEW MOON 
    19  00:56  Mercury 3.5°S of Moon
    19  22:56  Moon at Apogee: 406291 km
    20  05:53  Regulus 4.2°S of Moon
    20  20:00  Mars 3.3°S of Moon
    24  19:01  Spica 2.8°S of Moon
    25  07:05  Moon at Descending Node 
    25  14:07  FIRST QUARTER MOON 
    27  03     Mercury 5.1° of Venus
    28  08     Delta-Aquarid Meteor Shower
    28  09:11  Antares 1.3°S of Moon
    28  10:21  Mercury 0.1°S of Regulus

Aug 01  10:31  FULL MOON 
    01  21:52  Moon at Perigee: 357311 km
    03  02:21  Saturn 2.5°N of Moon
    06  18:46  Moon at Ascending Node 
    07  16     Venus at Aphelion 
    08  01:41  Jupiter 2.9°S of Moon
    08  02:28  LAST QUARTER MOON 
    09  04:16  Pleiades 1.5°N of Moon
    09  18     Mercury at Greatest Elong: 27.4°E
    10  10     Mercury at Aphelion 
    12  23     Perseid Meteor Shower
    13  00     Mercury 4.7° of Mars
    13  03     Venus at Inferior Conjunction 
    13  13:36  Pollux 1.7°N of Moon
    16  01:38  NEW MOON 
    16  03:55  Moon at Apogee: 406635 km
    18  15:06  Mars 2.2°S of Moon
    21  01:28  Spica 2.6°S of Moon
    21  08:23  Moon at Descending Node 
    24  01:57  FIRST QUARTER MOON 
    24  17:29  Antares 1.1°S of Moon
    27  00     Saturn at Opposition 
    30  07:51  Moon at Perigee: 357182 km
    30  10:03  Saturn 2.5°N of Moon
    30  17:35  FULL MOON 

Sep 02  23:44  Moon at Ascending Node 
    04  11:44  Jupiter 3.3°S of Moon
    05  11:25  Pleiades 1.2°N of Moon
    06  03     Mercury at Inferior Conjunction 
    06  14:21  LAST QUARTER MOON 
    09  19:32  Pollux 1.5°N of Moon
    10  21:15  Beehive 3.6°S of Moon
    12  07:42  Moon at Apogee: 406289 km
    12  18:00  Regulus 4.1°S of Moon
    14  17:40  NEW MOON 
    17  07:12  Spica 2.4°S of Moon
    17  11:18  Moon at Descending Node 
    19  02     Neptune at Opposition 
    20  23:50  Antares 0.9°S of Moon
    22  05     Mercury at Greatest Elong: 17.9°W
    22  11:32  FIRST QUARTER MOON 
    22  22:50  Autumnal Equinox 
    23  10     Mercury at Perihelion 
    26  17:25  Saturn 2.7°N of Moon
    27  17:05  Moon at Perigee: 359911 km
    29  01:57  FULL MOON 
    30  08:49  Moon at Ascending Node 

Oct 01  19:16  Jupiter 3.4°S of Moon
    02  20:25  Pleiades 1.1°N of Moon
    06  05:48  LAST QUARTER MOON 
    07  02:23  Pollux 1.4°N of Moon
    08  03:57  Beehive 3.7°S of Moon
    08  22:08  Venus 2.3°S of Regulus
    09  19:41  Moon at Apogee: 405426 km
    10  00:41  Regulus 4.2°S of Moon
    14  09:55  NEW MOON 
    14  09:59  Annular Solar Eclipse; mag=0.952
    14  17:11  Moon at Descending Node 
    18  05:17  Antares 0.9°S of Moon
    19  21     Mercury at Superior Conjunction 
    21  16     Orionid Meteor Shower
    21  19:29  FIRST QUARTER MOON 
    23  14     Venus at Greatest Elong: 46.4°W
    23  23:52  Saturn 2.8°N of Moon
    25  18:53  Moon at Perigee: 364873 km
    27  19:14  Moon at Ascending Node 
    28  12:14  Partial Lunar Eclipse; mag=0.122
    28  12:24  FULL MOON 
    29  00:10  Jupiter 3.1°S of Moon
    30  06:30  Pleiades 1.1°N of Moon

Nov 02  20     Jupiter at Opposition 
    03  10:31  Pollux 1.4°N of Moon
    04  11:46  Beehive 3.7°S of Moon
    05  00:37  LAST QUARTER MOON 
    05  16     S Taurid Meteor Shower
    06  08:19  Regulus 4.2°S of Moon
    06  13:49  Moon at Apogee: 404569 km
    09  01:28  Venus 1.0°S of Moon: Occn.
    10  21:09  Spica 2.4°S of Moon
    11  00:49  Moon at Descending Node 
    12  16     N Taurid Meteor Shower
    13  01:27  NEW MOON 
    13  10     Uranus at Opposition 
    16  13:17  Mercury 2.5°N of Antares
    17  21     Mars in Conjunction with Sun 
    17  22     Leonid Meteor Shower
    20  02:50  FIRST QUARTER MOON 
    20  06:02  Saturn 2.7°N of Moon
    21  13:03  Moon at Perigee: 369824 km
    24  03:02  Moon at Ascending Node 
    25  03:10  Jupiter 2.8°S of Moon
    26  16:02  Pleiades 1.1°N of Moon
    27  01:16  FULL MOON 
    28  01     Venus at Perihelion 
    29  02:27  Venus 3.9°N of Spica
    30  19:23  Pollux 1.6°N of Moon

Dec 01  20:21  Beehive 3.6°S of Moon
    03  16:38  Regulus 4.0°S of Moon
    04  06     Mercury at Greatest Elong: 21.3°E
    04  10:42  Moon at Apogee: 404348 km
    04  21:49  LAST QUARTER MOON 
    08  06:05  Spica 2.3°S of Moon
    08  07:24  Moon at Descending Node 
    09  08:53  Venus 3.6°N of Moon
    12  15:32  NEW MOON 
    13  21:18  Mercury 4.4°N of Moon
    14  11     Geminid Meteor Shower
    16  10:53  Moon at Perigee: 367900 km
    17  13:58  Saturn 2.5°N of Moon
    19  10:39  FIRST QUARTER MOON 
    20  09     Mercury at Perihelion 
    21  05:54  Moon at Ascending Node 
    21  19:28  Winter Solstice 
    22  06:20  Jupiter 2.6°S of Moon
    22  11     Mercury at Inferior Conjunction 
    22  19     Ursid Meteor Shower
    23  23:37  Pleiades 1.1°N of Moon
    26  16:33  FULL MOON 
    28  03:51  Pollux 1.7°N of Moon
    29  04:45  Beehive 3.4°S of Moon
    31  00:52  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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