2023 Calendar of Astronomical Events




    


2023 Phases of the Moon

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

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

Hawaiian 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     HST   Event
        (h:m)

Jan 01  05:25  Moon at Ascending Node 
    02  10     Mercury at Perihelion 
    02  15:24  Pleiades 2.6°N of Moon
    03  09:35  Mars 0.5°N of Moon: Occn.
    03  17     Quadrantid Meteor Shower
    04  06     Earth at Perihelion: 0.98329 AU
    06  13:08  FULL MOON 
    07  03     Mercury at Inferior Conjunction 
    07  03:40  Pollux 1.9°N of Moon
    07  23:19  Moon at Apogee: 406459 km
    08  05:23  Beehive 3.6°S of Moon
    10  01:38  Regulus 4.6°S of Moon
    14  11:59  Spica 3.9°S of Moon
    14  16:10  LAST QUARTER MOON 
    15  20:32  Moon at Descending Node 
    17  23:32  Antares 2.1°S of Moon
    21  10:53  NEW MOON 
    21  10:58  Moon at Perigee: 356570 km
    22  21:22  Saturn 3.8°N of Moon
    22  22:20  Venus 3.5°N of Moon
    24  22     Jupiter at Perihelion 
    25  16:00  Jupiter 1.8°N of Moon
    28  05:19  FIRST QUARTER MOON 
    28  06:05  Moon at Ascending Node 
    29  20     Mercury at Greatest Elong: 25.0°W
    29  21:21  Pleiades 2.4°N of Moon
    30  18:24  Mars 0.1°N of Moon: Occn.

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

Mar 02  04     Mercury 0.9° of Saturn
    02  16:10  Pollux 1.7°N of Moon
    03  08:01  Moon at Apogee: 405890 km
    03  17:56  Beehive 3.6°S of Moon
    05  14:08  Regulus 4.5°S of Moon
    07  02:40  FULL MOON 
    10  00:06  Spica 3.4°S of Moon
    10  22:53  Moon at Descending Node 
    13  14:21  Antares 1.6°S of Moon
    14  16:08  LAST QUARTER MOON 
    15  13     Neptune in Conjunction with Sun 
    17  01     Mercury at Superior Conjunction 
    19  05:16  Moon at Perigee: 362698 km
    19  05:20  Saturn 3.6°N of Moon
    20  11:25  Vernal Equinox 
    21  07:23  NEW MOON 
    23  16:08  Moon at Ascending Node 
    24  00:28  Venus 0.1°N of Moon: Occn.
    25  13:42  Pleiades 1.9°N of Moon
    28  03:16  Mars 2.3°S of Moon
    28  16:32  FIRST QUARTER MOON 
    29  23:23  Pollux 1.6°N of Moon
    31  01:07  Beehive 3.8°S of Moon
    31  01:18  Moon at Apogee: 404921 km
    31  10     Mercury at Perihelion 

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

May 01  13     Mercury at Inferior Conjunction 
    03  14:55  Spica 3.3°S of Moon
    04  11:57  Moon at Descending Node 
    05  04     Eta-Aquarid Meteor Shower
    05  07:23  Pen. Lunar Eclipse; mag=0.964
    05  07:34  FULL MOON 
    07  02:35  Antares 1.5°S of Moon
    08  01:27  Mars 4.9°S of Pollux
    09  11     Uranus in Conjunction with Sun 
    10  18:57  Moon at Perigee: 369345 km
    12  04:28  LAST QUARTER MOON 
    13  03:04  Saturn 3.3°N of Moon
    17  03     Mercury 6.2° of Jupiter
    17  03:15  Jupiter 0.8°S of Moon: Occn.
    17  09:36  Moon at Ascending Node 
    17  15:34  Mercury 3.6°S of Moon
    19  05:53  NEW MOON 
    23  02:08  Venus 2.2°S of Moon
    23  15:37  Pollux 1.6°N of Moon
    24  07:32  Mars 3.8°S of Moon
    24  17:06  Beehive 3.8°S of Moon
    25  15:39  Moon at Apogee: 404510 km
    26  13:30  Regulus 4.6°S of Moon
    27  05:22  FIRST QUARTER MOON 
    28  19     Mercury at Greatest Elong: 24.9°W
    29  03:04  Venus 3.9°S of Pollux
    30  13     Mars at Aphelion 
    31  00:05  Spica 3.3°S of Moon
    31  20:22  Moon at Descending Node 

Jun 01  17:35  Mars 0.1°S of Beehive
    03  11:19  Antares 1.6°S of Moon
    03  17:42  FULL MOON 
    04  01     Venus at Greatest Elong: 45.4°E
    06  13:07  Moon at Perigee: 364860 km
    09  10:19  Saturn 3.0°N of Moon
    10  09:31  LAST QUARTER MOON 
    11  07:50  Mercury 5.9°S of Pleiades
    13  01:05  Venus 0.5°N of Beehive
    13  14:05  Moon at Ascending Node 
    13  20:33  Jupiter 1.5°S of Moon
    15  14:47  Pleiades 1.8°N of Moon
    16  10:16  Mercury 4.2°N of Aldebaran
    16  10:39  Mercury 4.3°S of Moon
    17  18:37  NEW MOON 
    19  23:10  Pollux 1.7°N of Moon
    21  00:38  Beehive 3.6°S of Moon
    21  04:58  Summer Solstice 
    21  14:47  Venus 3.7°S of Moon
    22  00:09  Mars 3.8°S of Moon
    22  08:30  Moon at Apogee: 405385 km
    22  21:08  Regulus 4.4°S of Moon
    25  21:50  FIRST QUARTER MOON 
    27  09     Mercury at Perihelion 
    27  09:08  Spica 3.1°S of Moon
    28  02:22  Moon at Descending Node 
    30  19     Mercury at Superior Conjunction 
    30  21:20  Antares 1.5°S of Moon

Date     HST   Event
        (h:m)

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

Aug 01  08:31  FULL MOON 
    01  19:52  Moon at Perigee: 357311 km
    03  00:21  Saturn 2.5°N of Moon
    06  16:46  Moon at Ascending Node 
    07  14     Venus at Aphelion 
    07  23:41  Jupiter 2.9°S of Moon
    08  00:28  LAST QUARTER MOON 
    09  02:16  Pleiades 1.5°N of Moon
    09  16     Mercury at Greatest Elong: 27.4°E
    10  08     Mercury at Aphelion 
    12  21     Perseid Meteor Shower
    12  22     Mercury 4.7° of Mars
    13  01     Venus at Inferior Conjunction 
    13  11:36  Pollux 1.7°N of Moon
    15  23:38  NEW MOON 
    16  01:55  Moon at Apogee: 406635 km
    18  13:06  Mars 2.2°S of Moon
    20  23:28  Spica 2.6°S of Moon
    21  06:23  Moon at Descending Node 
    23  23:57  FIRST QUARTER MOON 
    24  15:29  Antares 1.1°S of Moon
    26  22     Saturn at Opposition 
    30  05:51  Moon at Perigee: 357182 km
    30  08:03  Saturn 2.5°N of Moon
    30  15:35  FULL MOON 

Sep 02  21:44  Moon at Ascending Node 
    04  09:44  Jupiter 3.3°S of Moon
    05  09:25  Pleiades 1.2°N of Moon
    06  01     Mercury at Inferior Conjunction 
    06  12:21  LAST QUARTER MOON 
    09  17:32  Pollux 1.5°N of Moon
    10  19:15  Beehive 3.6°S of Moon
    12  05:42  Moon at Apogee: 406289 km
    12  16:00  Regulus 4.1°S of Moon
    14  15:40  NEW MOON 
    17  05:12  Spica 2.4°S of Moon
    17  09:18  Moon at Descending Node 
    19  00     Neptune at Opposition 
    20  21:50  Antares 0.9°S of Moon
    22  03     Mercury at Greatest Elong: 17.9°W
    22  09:32  FIRST QUARTER MOON 
    22  20:50  Autumnal Equinox 
    23  08     Mercury at Perihelion 
    26  15:25  Saturn 2.7°N of Moon
    27  15:05  Moon at Perigee: 359911 km
    28  23:57  FULL MOON 
    30  06:49  Moon at Ascending Node 

Oct 01  17:16  Jupiter 3.4°S of Moon
    02  18:25  Pleiades 1.1°N of Moon
    06  03:48  LAST QUARTER MOON 
    07  00:23  Pollux 1.4°N of Moon
    08  01:57  Beehive 3.7°S of Moon
    08  20:08  Venus 2.3°S of Regulus
    09  17:41  Moon at Apogee: 405426 km
    09  22:41  Regulus 4.2°S of Moon
    14  07:55  NEW MOON 
    14  07:59  Annular Solar Eclipse; mag=0.952
    14  15:11  Moon at Descending Node 
    18  03:17  Antares 0.9°S of Moon
    19  19     Mercury at Superior Conjunction 
    21  14     Orionid Meteor Shower
    21  17:29  FIRST QUARTER MOON 
    23  12     Venus at Greatest Elong: 46.4°W
    23  21:52  Saturn 2.8°N of Moon
    25  16:53  Moon at Perigee: 364873 km
    27  17:14  Moon at Ascending Node 
    28  10:14  Partial Lunar Eclipse; mag=0.122
    28  10:24  FULL MOON 
    28  22:10  Jupiter 3.1°S of Moon
    30  04:30  Pleiades 1.1°N of Moon

Nov 02  18     Jupiter at Opposition 
    03  08:31  Pollux 1.4°N of Moon
    04  09:46  Beehive 3.7°S of Moon
    04  22:37  LAST QUARTER MOON 
    05  14     S Taurid Meteor Shower
    06  06:19  Regulus 4.2°S of Moon
    06  11:49  Moon at Apogee: 404569 km
    08  23:28  Venus 1.0°S of Moon: Occn.
    10  19:09  Spica 2.4°S of Moon
    10  22:49  Moon at Descending Node 
    12  14     N Taurid Meteor Shower
    12  23:27  NEW MOON 
    13  08     Uranus at Opposition 
    16  11:17  Mercury 2.5°N of Antares
    17  19     Mars in Conjunction with Sun 
    17  20     Leonid Meteor Shower
    20  00:50  FIRST QUARTER MOON 
    20  04:02  Saturn 2.7°N of Moon
    21  11:03  Moon at Perigee: 369824 km
    24  01:02  Moon at Ascending Node 
    25  01:10  Jupiter 2.8°S of Moon
    26  14:02  Pleiades 1.1°N of Moon
    26  23:16  FULL MOON 
    27  23     Venus at Perihelion 
    29  00:27  Venus 3.9°N of Spica
    30  17:23  Pollux 1.6°N of Moon

Dec 01  18:21  Beehive 3.6°S of Moon
    03  14:38  Regulus 4.0°S of Moon
    04  04     Mercury at Greatest Elong: 21.3°E
    04  08:42  Moon at Apogee: 404348 km
    04  19:49  LAST QUARTER MOON 
    08  04:05  Spica 2.3°S of Moon
    08  05:24  Moon at Descending Node 
    09  06:53  Venus 3.6°N of Moon
    12  13:32  NEW MOON 
    13  19:18  Mercury 4.4°N of Moon
    14  09     Geminid Meteor Shower
    16  08:53  Moon at Perigee: 367900 km
    17  11:58  Saturn 2.5°N of Moon
    19  08:39  FIRST QUARTER MOON 
    20  07     Mercury at Perihelion 
    21  03:54  Moon at Ascending Node 
    21  17:28  Winter Solstice 
    22  04:20  Jupiter 2.6°S of Moon
    22  09     Mercury at Inferior Conjunction 
    22  17     Ursid Meteor Shower
    23  21:37  Pleiades 1.1°N of Moon
    26  14:33  FULL MOON 
    28  01:51  Pollux 1.7°N of Moon
    29  02:45  Beehive 3.4°S of Moon
    30  22:52  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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