2023Calendar of Astronomical Events

    

2023Phases of the Moon

Pacific Standard Time

The following table gives the date and time of the Moon's phases for the year. The times listed are for Pacific Standard Time(Greenwich Mean Time - 8 hours).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.


2023Calendar of Astronomical Events

Pacific Standard Time

The following table gives the date and time of the important astronomical events for the year. The times listed are for Pacific Standard Time(Greenwich Mean Time - 8 hours).If Daylight Saving Time is in effect, add one hour to the times listed. A key to astronomical terms appears below the calendar.

2023Calendar of Astronomical Events
Pacific Standard Time
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    20  04     Jupiter at Perihelion:  4.95101 AU    21  12:53  NEW MOON     21  12:58  Moon at Perigee: 356570 km    22  14     Venus 0.3°S of Saturn    22  23:22  Saturn 3.8°N of Moon    23  00:20  Venus 3.5°N of Moon    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 01  20     Venus 0.5°N of Jupiter    02  06     Mercury 0.9°S 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    27  20     Mercury 1.3°N of Jupiter    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 MoonMay 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°N 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  13     Mars at Aphelion:  1.66594 AU    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  22     Venus 3.6°N of Mars    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°N 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 RegulusAug 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°S 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 MoonNov 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 MoonDec 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     27  14     Mercury 3.6°N of Mars    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    

Terms Used in Astronomical Events Calendar

  • Perihelion - instant when a planet is closest to the Sun
  • Aphelion - instant when a planet is furthest from the Sun
  • Perigee - instant when the Moon is closest to Earth
  • Apogee - instant when the Moon is furthest from Earth
  • Inferior Conjunction - instant when a planet (Mercury or Venus) passes between Earth and the Sun
  • Superior Conjunction - instant when a planet (Mercury or Venus) passes on the opposite side of the Sun from Earth
  • Greatest Elongation - the maximum angular separation between the Sun and the planet (Mercury or Venus) 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 - instant when a planet appears opposite the Sun as seen from Earth
  • Conjunction - instant when a planet appears closest the Sun as seen from Earth
  • Occultation - the Moon occults or eclipses a star or planet
  • Ascending Node - point where the Moon crosses from the southern to northern portion of its orbit
  • Descending Node - point where the Moon crosses from the northern to the southern portion of its orbit

  • Aldebaran - bright star in the constellation Taurus
  • Pollux - bright star in the constellation Gemini
  • Regulus - bright star in the constellation Leo
  • Spica - bright star in the constellation Virgo
  • Antares - bright star in the constellation Scorpius
  • Pleiades - bright star cluster in the constellation Taurus
  • Beehive - bright star cluster in the constellation Cancer

Calendars of Astronomical Events: 2021 to 2030

The Americas

Below are links to calendars of astronomical events from 2021 to 2030 for seven time zones in the Americas.
Choose a time zone and click on a year to get a calendar of astronomical events for that year.

Calendars of Astronomical Events - The Americas
AST 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030
EST 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030
CST 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030
MST 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030
PST 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030
AKST 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030
HST 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030

        Time Zones Abbreviations
        • AST = Atlantic Standard Time (= GMT - 4 hours)
        • EST = Eastern Standard Time (= GMT - 5 hours)
        • CST = Central Standard Time (= GMT - 6 hours)
        • MST = Mountain Standard Time (= GMT - 7 hours)
        • PST = Pacific Standard Time (= GMT - 8 hours)
        • AKST = Alaskan Standard Time (= GMT - 9 hours)
        • HST = Hawaiian Standard Time (= GMT - 10 hours)
          (where GMT = Greenwich Mean Time)

A time zone may have a different name in different countries. Note the difference in hours between a given time zone and Greenwich Mean Time to help in identification.

For other years and other time zones, visit: Calendars of Astronomical Events.

Accuracy of the Astronomical Events Calendars

The goal of the Astronomical Events Calendars is to present a wide range of solar system phenomena with reasonable accuracy. In general, events listed to the nearest hour are accurate to ± 30 minutes.Events listed with a precision in hours and minutes (i.e., hh:mm) are typically accurate to ± 5 minutes or less.

The following table gives a more detailed breakdown of the accuracy of times for various astronomical events.

Accuracy of the Astronomical Events Calendars
Solstice/Equinox (Earth) ± 0.5 minute
Aphelion/Perihelion (Earth) ± 30 minutes; ± 0.00001 AU
Solar and Lunar Eclipses ± 0.5 minute
Phases of the Moon ± 0.5 minute
Moon at Nodes ± 2 minutes
Apogee/Perigee of Moon ± 5 minutes; ± 5 kilometers
Conjunctions of Moon with Star or Planet ± 10 minutes
Conjunctions of Planet with Planet ± 3 hours
Inferior/Superior Conjunctions (Mercury & Venus) ± 30 minutes
Greatest Elongation (Mercury & Venus) ± 30 minutes
Opposition/Conjunction (Outer Planets) ± 3 hours
Aphelion/Perihelion of Planets ± 30 minutes

Acknowledgements

All calculations are by Fred Espenak and he assumes full responsibility for their accuracy. Algorithms used in predicting many of the astronomical events 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:


Return to: Calendars of Astronomical Events

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