2023 Calendar of Astronomical Events




    


2023 Phases of the Moon

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

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

Eastern 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     EST   Event
        (h:m)

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

Feb 03  14:47  Pollux 1.9°N of Moon
    04  03:55  Moon at Apogee: 406476 km
    04  16:32  Beehive 3.5°S of Moon
    05  13:29  FULL MOON 
    06  12:44  Regulus 4.5°S of Moon
    10  23:23  Spica 3.6°S of Moon
    12  02:31  Moon at Descending Node 
    13  11:01  LAST QUARTER MOON 
    14  13:09  Antares 1.9°S of Moon
    15  15     Mercury at Aphelion 
    16  11     Saturn in Conjunction with Sun 
    18  15:53  Mercury 3.6°N of Moon
    19  04:06  Moon at Perigee: 358267 km
    20  02:06  NEW MOON 
    22  02:57  Venus 2.1°N of Moon
    22  16:58  Jupiter 1.2°N of Moon: Occn.
    24  13:56  Moon at Ascending Node 
    26  09:42  Pleiades 2.1°N of Moon
    27  03:06  FIRST QUARTER MOON 
    27  23:32  Mars 1.1°S of Moon: Occn.

Mar 02  09     Mercury 0.9° of Saturn
    02  21:10  Pollux 1.7°N of Moon
    03  13:01  Moon at Apogee: 405890 km
    03  22:56  Beehive 3.6°S of Moon
    05  19:08  Regulus 4.5°S of Moon
    07  07:40  FULL MOON 
    10  05:06  Spica 3.4°S of Moon
    11  03:53  Moon at Descending Node 
    13  19:21  Antares 1.6°S of Moon
    14  21:08  LAST QUARTER MOON 
    15  18     Neptune in Conjunction with Sun 
    17  06     Mercury at Superior Conjunction 
    19  10:16  Moon at Perigee: 362698 km
    19  10:20  Saturn 3.6°N of Moon
    20  16:25  Vernal Equinox 
    21  12:23  NEW MOON 
    23  21:08  Moon at Ascending Node 
    24  05:28  Venus 0.1°N of Moon: Occn.
    25  18:42  Pleiades 1.9°N of Moon
    28  08:16  Mars 2.3°S of Moon
    28  21:32  FIRST QUARTER MOON 
    30  04:23  Pollux 1.6°N of Moon
    31  06:07  Beehive 3.8°S of Moon
    31  06:18  Moon at Apogee: 404921 km
    31  15     Mercury at Perihelion 

Apr 02  02:22  Regulus 4.6°S of Moon
    05  23:35  FULL MOON 
    06  11:45  Spica 3.3°S of Moon
    07  08:51  Moon at Descending Node 
    10  00:50  Antares 1.5°S of Moon
    10  23:42  Venus 2.5°S of Pleiades
    11  16     Jupiter in Conjunction with Sun 
    11  17     Mercury at Greatest Elong: 19.5°E
    13  04:11  LAST QUARTER MOON 
    15  21:22  Moon at Perigee: 367967 km
    15  22:47  Saturn 3.5°N of Moon
    17  11     Venus at Perihelion 
    19  04:08  Venus 7.3°N of Aldebaran
    19  23:12  NEW MOON 
    19  23:17  Hybrid Solar Eclipse; mag=1.013
    20  06:32  Moon at Ascending Node 
    22  04:14  Pleiades 1.9°N of Moon
    22  20     Lyrid Meteor Shower
    23  08:03  Venus 1.3°S of Moon
    25  21:18  Mars 3.2°S of Moon
    26  12:26  Pollux 1.5°N of Moon
    27  14:02  Beehive 3.8°S of Moon
    27  16:20  FIRST QUARTER MOON 
    28  01:43  Moon at Apogee: 404300 km
    29  10:21  Regulus 4.7°S of Moon

May 01  18     Mercury at Inferior Conjunction 
    03  19:55  Spica 3.3°S of Moon
    04  16:57  Moon at Descending Node 
    05  09     Eta-Aquarid Meteor Shower
    05  12:23  Pen. Lunar Eclipse; mag=0.964
    05  12:34  FULL MOON 
    07  07:35  Antares 1.5°S of Moon
    08  06:27  Mars 4.9°S of Pollux
    09  16     Uranus in Conjunction with Sun 
    10  23:57  Moon at Perigee: 369345 km
    12  09:28  LAST QUARTER MOON 
    13  08:04  Saturn 3.3°N of Moon
    17  08     Mercury 6.2° of Jupiter
    17  08:15  Jupiter 0.8°S of Moon: Occn.
    17  14:36  Moon at Ascending Node 
    17  20:34  Mercury 3.6°S of Moon
    19  10:53  NEW MOON 
    23  07:08  Venus 2.2°S of Moon
    23  20:37  Pollux 1.6°N of Moon
    24  12:32  Mars 3.8°S of Moon
    24  22:06  Beehive 3.8°S of Moon
    25  20:39  Moon at Apogee: 404510 km
    26  18:30  Regulus 4.6°S of Moon
    27  10:22  FIRST QUARTER MOON 
    29  00     Mercury at Greatest Elong: 24.9°W
    29  08:04  Venus 3.9°S of Pollux
    30  18     Mars at Aphelion 
    31  05:05  Spica 3.3°S of Moon

Jun 01  01:22  Moon at Descending Node 
    01  22:35  Mars 0.1°S of Beehive
    03  16:19  Antares 1.6°S of Moon
    03  22:42  FULL MOON 
    04  06     Venus at Greatest Elong: 45.4°E
    06  18:07  Moon at Perigee: 364860 km
    09  15:19  Saturn 3.0°N of Moon
    10  14:31  LAST QUARTER MOON 
    11  12:50  Mercury 5.9°S of Pleiades
    13  06:05  Venus 0.5°N of Beehive
    13  19:05  Moon at Ascending Node 
    14  01:33  Jupiter 1.5°S of Moon
    15  19:47  Pleiades 1.8°N of Moon
    16  15:16  Mercury 4.2°N of Aldebaran
    16  15:39  Mercury 4.3°S of Moon
    17  23:37  NEW MOON 
    20  04:10  Pollux 1.7°N of Moon
    21  05:38  Beehive 3.6°S of Moon
    21  09:58  Summer Solstice 
    21  19:47  Venus 3.7°S of Moon
    22  05:09  Mars 3.8°S of Moon
    22  13:30  Moon at Apogee: 405385 km
    23  02:08  Regulus 4.4°S of Moon
    26  02:50  FIRST QUARTER MOON 
    27  14     Mercury at Perihelion 
    27  14:08  Spica 3.1°S of Moon
    28  07:22  Moon at Descending Node 

Date     EST   Event
        (h:m)

Jul 01  00     Mercury at Superior Conjunction 
    01  02:20  Antares 1.5°S of Moon
    03  06:39  FULL MOON 
    04  17:28  Moon at Perigee: 360151 km
    06  14     Earth at Aphelion: 1.01668 AU
    06  22:05  Saturn 2.7°N of Moon
    09  20:48  LAST QUARTER MOON 
    10  00:21  Mars 0.6°N of Regulus
    10  20:23  Moon at Ascending Node 
    11  16:18  Jupiter 2.2°S of Moon
    13  01:31  Pleiades 1.7°N of Moon
    14  17:33  Mercury 0.2°N of Beehive
    16  03:05  Venus 1.7°S of Regulus
    17  13:32  NEW MOON 
    19  03:56  Mercury 3.5°S of Moon
    20  01:56  Moon at Apogee: 406291 km
    20  08:53  Regulus 4.2°S of Moon
    20  23:00  Mars 3.3°S of Moon
    24  22:01  Spica 2.8°S of Moon
    25  10:05  Moon at Descending Node 
    25  17:07  FIRST QUARTER MOON 
    27  06     Mercury 5.1° of Venus
    28  11     Delta-Aquarid Meteor Shower
    28  12:11  Antares 1.3°S of Moon
    28  13:21  Mercury 0.1°S of Regulus

Aug 01  13:31  FULL MOON 
    02  00:52  Moon at Perigee: 357311 km
    03  05:21  Saturn 2.5°N of Moon
    06  21:46  Moon at Ascending Node 
    07  19     Venus at Aphelion 
    08  04:41  Jupiter 2.9°S of Moon
    08  05:28  LAST QUARTER MOON 
    09  07:16  Pleiades 1.5°N of Moon
    09  21     Mercury at Greatest Elong: 27.4°E
    10  13     Mercury at Aphelion 
    13  02     Perseid Meteor Shower
    13  03     Mercury 4.7° of Mars
    13  06     Venus at Inferior Conjunction 
    13  16:36  Pollux 1.7°N of Moon
    16  04:38  NEW MOON 
    16  06:55  Moon at Apogee: 406635 km
    18  18:06  Mars 2.2°S of Moon
    21  04:28  Spica 2.6°S of Moon
    21  11:23  Moon at Descending Node 
    24  04:57  FIRST QUARTER MOON 
    24  20:29  Antares 1.1°S of Moon
    27  03     Saturn at Opposition 
    30  10:51  Moon at Perigee: 357182 km
    30  13:03  Saturn 2.5°N of Moon
    30  20:35  FULL MOON 

Sep 03  02:44  Moon at Ascending Node 
    04  14:44  Jupiter 3.3°S of Moon
    05  14:25  Pleiades 1.2°N of Moon
    06  06     Mercury at Inferior Conjunction 
    06  17:21  LAST QUARTER MOON 
    09  22:32  Pollux 1.5°N of Moon
    11  00:15  Beehive 3.6°S of Moon
    12  10:42  Moon at Apogee: 406289 km
    12  21:00  Regulus 4.1°S of Moon
    14  20:40  NEW MOON 
    17  10:12  Spica 2.4°S of Moon
    17  14:18  Moon at Descending Node 
    19  05     Neptune at Opposition 
    21  02:50  Antares 0.9°S of Moon
    22  08     Mercury at Greatest Elong: 17.9°W
    22  14:32  FIRST QUARTER MOON 
    23  01:50  Autumnal Equinox 
    23  13     Mercury at Perihelion 
    26  20:25  Saturn 2.7°N of Moon
    27  20:05  Moon at Perigee: 359911 km
    29  04:57  FULL MOON 
    30  11:49  Moon at Ascending Node 

Oct 01  22:16  Jupiter 3.4°S of Moon
    02  23:25  Pleiades 1.1°N of Moon
    06  08:48  LAST QUARTER MOON 
    07  05:23  Pollux 1.4°N of Moon
    08  06:57  Beehive 3.7°S of Moon
    09  01:08  Venus 2.3°S of Regulus
    09  22:41  Moon at Apogee: 405426 km
    10  03:41  Regulus 4.2°S of Moon
    14  12:55  NEW MOON 
    14  12:59  Annular Solar Eclipse; mag=0.952
    14  20:11  Moon at Descending Node 
    18  08:17  Antares 0.9°S of Moon
    20  00     Mercury at Superior Conjunction 
    21  19     Orionid Meteor Shower
    21  22:29  FIRST QUARTER MOON 
    23  17     Venus at Greatest Elong: 46.4°W
    24  02:52  Saturn 2.8°N of Moon
    25  21:53  Moon at Perigee: 364873 km
    27  22:14  Moon at Ascending Node 
    28  15:14  Partial Lunar Eclipse; mag=0.122
    28  15:24  FULL MOON 
    29  03:10  Jupiter 3.1°S of Moon
    30  09:30  Pleiades 1.1°N of Moon

Nov 02  23     Jupiter at Opposition 
    03  13:31  Pollux 1.4°N of Moon
    04  14:46  Beehive 3.7°S of Moon
    05  03:37  LAST QUARTER MOON 
    05  19     S Taurid Meteor Shower
    06  11:19  Regulus 4.2°S of Moon
    06  16:49  Moon at Apogee: 404569 km
    09  04:28  Venus 1.0°S of Moon: Occn.
    11  00:09  Spica 2.4°S of Moon
    11  03:49  Moon at Descending Node 
    12  19     N Taurid Meteor Shower
    13  04:27  NEW MOON 
    13  13     Uranus at Opposition 
    16  16:17  Mercury 2.5°N of Antares
    18  00     Mars in Conjunction with Sun 
    18  01     Leonid Meteor Shower
    20  05:50  FIRST QUARTER MOON 
    20  09:02  Saturn 2.7°N of Moon
    21  16:03  Moon at Perigee: 369824 km
    24  06:02  Moon at Ascending Node 
    25  06:10  Jupiter 2.8°S of Moon
    26  19:02  Pleiades 1.1°N of Moon
    27  04:16  FULL MOON 
    28  04     Venus at Perihelion 
    29  05:27  Venus 3.9°N of Spica
    30  22:23  Pollux 1.6°N of Moon

Dec 01  23:21  Beehive 3.6°S of Moon
    03  19:38  Regulus 4.0°S of Moon
    04  09     Mercury at Greatest Elong: 21.3°E
    04  13:42  Moon at Apogee: 404348 km
    05  00:49  LAST QUARTER MOON 
    08  09:05  Spica 2.3°S of Moon
    08  10:24  Moon at Descending Node 
    09  11:53  Venus 3.6°N of Moon
    12  18:32  NEW MOON 
    14  00:18  Mercury 4.4°N of Moon
    14  14     Geminid Meteor Shower
    16  13:53  Moon at Perigee: 367900 km
    17  16:58  Saturn 2.5°N of Moon
    19  13:39  FIRST QUARTER MOON 
    20  12     Mercury at Perihelion 
    21  08:54  Moon at Ascending Node 
    21  22:28  Winter Solstice 
    22  09:20  Jupiter 2.6°S of Moon
    22  14     Mercury at Inferior Conjunction 
    22  22     Ursid Meteor Shower
    24  02:37  Pleiades 1.1°N of Moon
    26  19:33  FULL MOON 
    28  06:51  Pollux 1.7°N of Moon
    29  07:45  Beehive 3.4°S of Moon
    31  03:52  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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