2023 Calendar of Astronomical Events




    


2023 Phases of the Moon

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

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

Mountain 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     MST   Event
        (h:m)

Jan 01  08:25  Moon at Ascending Node 
    02  13     Mercury at Perihelion 
    02  18:24  Pleiades 2.6°N of Moon
    03  12:35  Mars 0.5°N of Moon: Occn.
    03  20     Quadrantid Meteor Shower
    04  09     Earth at Perihelion: 0.98329 AU
    06  16:08  FULL MOON 
    07  06     Mercury at Inferior Conjunction 
    07  06:40  Pollux 1.9°N of Moon
    08  02:19  Moon at Apogee: 406459 km
    08  08:23  Beehive 3.6°S of Moon
    10  04:38  Regulus 4.6°S of Moon
    14  14:59  Spica 3.9°S of Moon
    14  19:10  LAST QUARTER MOON 
    15  23:32  Moon at Descending Node 
    18  02:32  Antares 2.1°S of Moon
    21  13:53  NEW MOON 
    21  13:58  Moon at Perigee: 356570 km
    23  00:22  Saturn 3.8°N of Moon
    23  01:20  Venus 3.5°N of Moon
    25  01     Jupiter at Perihelion 
    25  19:00  Jupiter 1.8°N of Moon
    28  08:19  FIRST QUARTER MOON 
    28  09:05  Moon at Ascending Node 
    29  23     Mercury at Greatest Elong: 25.0°W
    30  00:21  Pleiades 2.4°N of Moon
    30  21:24  Mars 0.1°N of Moon: Occn.

Feb 03  12:47  Pollux 1.9°N of Moon
    04  01:55  Moon at Apogee: 406476 km
    04  14:32  Beehive 3.5°S of Moon
    05  11:29  FULL MOON 
    06  10:44  Regulus 4.5°S of Moon
    10  21:23  Spica 3.6°S of Moon
    12  00:31  Moon at Descending Node 
    13  09:01  LAST QUARTER MOON 
    14  11:09  Antares 1.9°S of Moon
    15  13     Mercury at Aphelion 
    16  09     Saturn in Conjunction with Sun 
    18  13:53  Mercury 3.6°N of Moon
    19  02:06  Moon at Perigee: 358267 km
    20  00:06  NEW MOON 
    22  00:57  Venus 2.1°N of Moon
    22  14:58  Jupiter 1.2°N of Moon: Occn.
    24  11:56  Moon at Ascending Node 
    26  07:42  Pleiades 2.1°N of Moon
    27  01:06  FIRST QUARTER MOON 
    27  21:32  Mars 1.1°S of Moon: Occn.

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

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

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

Jun 01  20:35  Mars 0.1°S of Beehive
    03  14:19  Antares 1.6°S of Moon
    03  20:42  FULL MOON 
    04  04     Venus at Greatest Elong: 45.4°E
    06  16:07  Moon at Perigee: 364860 km
    09  13:19  Saturn 3.0°N of Moon
    10  12:31  LAST QUARTER MOON 
    11  10:50  Mercury 5.9°S of Pleiades
    13  04:05  Venus 0.5°N of Beehive
    13  17:05  Moon at Ascending Node 
    13  23:33  Jupiter 1.5°S of Moon
    15  17:47  Pleiades 1.8°N of Moon
    16  13:16  Mercury 4.2°N of Aldebaran
    16  13:39  Mercury 4.3°S of Moon
    17  21:37  NEW MOON 
    20  02:10  Pollux 1.7°N of Moon
    21  03:38  Beehive 3.6°S of Moon
    21  07:58  Summer Solstice 
    21  17:47  Venus 3.7°S of Moon
    22  03:09  Mars 3.8°S of Moon
    22  11:30  Moon at Apogee: 405385 km
    23  00:08  Regulus 4.4°S of Moon
    26  00:50  FIRST QUARTER MOON 
    27  12     Mercury at Perihelion 
    27  12:08  Spica 3.1°S of Moon
    28  05:22  Moon at Descending Node 
    30  22     Mercury at Superior Conjunction 

Date     MST   Event
        (h:m)

Jul 01  00:20  Antares 1.5°S of Moon
    03  04:39  FULL MOON 
    04  15:28  Moon at Perigee: 360151 km
    06  12     Earth at Aphelion: 1.01668 AU
    06  20:05  Saturn 2.7°N of Moon
    09  18:48  LAST QUARTER MOON 
    09  22:21  Mars 0.6°N of Regulus
    10  18:23  Moon at Ascending Node 
    11  14:18  Jupiter 2.2°S of Moon
    12  23:31  Pleiades 1.7°N of Moon
    14  15:33  Mercury 0.2°N of Beehive
    16  01:05  Venus 1.7°S of Regulus
    17  11:32  NEW MOON 
    19  01:56  Mercury 3.5°S of Moon
    19  23:56  Moon at Apogee: 406291 km
    20  06:53  Regulus 4.2°S of Moon
    20  21:00  Mars 3.3°S of Moon
    24  20:01  Spica 2.8°S of Moon
    25  08:05  Moon at Descending Node 
    25  15:07  FIRST QUARTER MOON 
    27  04     Mercury 5.1° of Venus
    28  09     Delta-Aquarid Meteor Shower
    28  10:11  Antares 1.3°S of Moon
    28  11:21  Mercury 0.1°S of Regulus

Aug 01  11:31  FULL MOON 
    01  22:52  Moon at Perigee: 357311 km
    03  03:21  Saturn 2.5°N of Moon
    06  19:46  Moon at Ascending Node 
    07  17     Venus at Aphelion 
    08  02:41  Jupiter 2.9°S of Moon
    08  03:28  LAST QUARTER MOON 
    09  05:16  Pleiades 1.5°N of Moon
    09  19     Mercury at Greatest Elong: 27.4°E
    10  11     Mercury at Aphelion 
    13  00     Perseid Meteor Shower
    13  01     Mercury 4.7° of Mars
    13  04     Venus at Inferior Conjunction 
    13  14:36  Pollux 1.7°N of Moon
    16  02:38  NEW MOON 
    16  04:55  Moon at Apogee: 406635 km
    18  16:06  Mars 2.2°S of Moon
    21  02:28  Spica 2.6°S of Moon
    21  09:23  Moon at Descending Node 
    24  02:57  FIRST QUARTER MOON 
    24  18:29  Antares 1.1°S of Moon
    27  01     Saturn at Opposition 
    30  08:51  Moon at Perigee: 357182 km
    30  11:03  Saturn 2.5°N of Moon
    30  18:35  FULL MOON 

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

Oct 01  20:16  Jupiter 3.4°S of Moon
    02  21:25  Pleiades 1.1°N of Moon
    06  06:48  LAST QUARTER MOON 
    07  03:23  Pollux 1.4°N of Moon
    08  04:57  Beehive 3.7°S of Moon
    08  23:08  Venus 2.3°S of Regulus
    09  20:41  Moon at Apogee: 405426 km
    10  01:41  Regulus 4.2°S of Moon
    14  10:55  NEW MOON 
    14  10:59  Annular Solar Eclipse; mag=0.952
    14  18:11  Moon at Descending Node 
    18  06:17  Antares 0.9°S of Moon
    19  22     Mercury at Superior Conjunction 
    21  17     Orionid Meteor Shower
    21  20:29  FIRST QUARTER MOON 
    23  15     Venus at Greatest Elong: 46.4°W
    24  00:52  Saturn 2.8°N of Moon
    25  19:53  Moon at Perigee: 364873 km
    27  20:14  Moon at Ascending Node 
    28  13:14  Partial Lunar Eclipse; mag=0.122
    28  13:24  FULL MOON 
    29  01:10  Jupiter 3.1°S of Moon
    30  07:30  Pleiades 1.1°N of Moon

Nov 02  21     Jupiter at Opposition 
    03  11:31  Pollux 1.4°N of Moon
    04  12:46  Beehive 3.7°S of Moon
    05  01:37  LAST QUARTER MOON 
    05  17     S Taurid Meteor Shower
    06  09:19  Regulus 4.2°S of Moon
    06  14:49  Moon at Apogee: 404569 km
    09  02:28  Venus 1.0°S of Moon: Occn.
    10  22:09  Spica 2.4°S of Moon
    11  01:49  Moon at Descending Node 
    12  17     N Taurid Meteor Shower
    13  02:27  NEW MOON 
    13  11     Uranus at Opposition 
    16  14:17  Mercury 2.5°N of Antares
    17  22     Mars in Conjunction with Sun 
    17  23     Leonid Meteor Shower
    20  03:50  FIRST QUARTER MOON 
    20  07:02  Saturn 2.7°N of Moon
    21  14:03  Moon at Perigee: 369824 km
    24  04:02  Moon at Ascending Node 
    25  04:10  Jupiter 2.8°S of Moon
    26  17:02  Pleiades 1.1°N of Moon
    27  02:16  FULL MOON 
    28  02     Venus at Perihelion 
    29  03:27  Venus 3.9°N of Spica
    30  20:23  Pollux 1.6°N of Moon

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