2023Calendar of Astronomical Events
2023Phases of the Moon
Mountain Standard Time
The following table gives the date and time of the Moon's phases for the year. The times listed are for Mountain Standard Time(Greenwich Mean Time - 7 hours).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.
2023Calendar of Astronomical Events
Mountain Standard Time
The following table gives the date and time of the important astronomical events for the year. The times listed are for Mountain Standard Time(Greenwich Mean Time - 7 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 | ||||||||
| Mountain Standard Time | ||||||||
| 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 20 05 Jupiter at Perihelion: 4.95101 AU 21 13:53 NEW MOON 21 13:58 Moon at Perigee: 356570 km 22 15 Venus 0.3°S of Saturn 23 00:22 Saturn 3.8°N of Moon 23 01:20 Venus 3.5°N of Moon 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 01 21 Venus 0.5°N of Jupiter 02 07 Mercury 0.9°S 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 27 21 Mercury 1.3°N of Jupiter 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 MoonMay 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°N 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 14 Mars at Aphelion: 1.66594 AU 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 30 23 Venus 3.6°N of Mars | 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°N 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 RegulusAug 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°S 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 MoonNov 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 MoonDec 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 27 15 Mercury 3.6°N of Mars 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 | |||||||
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 | |||||
- 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)
- Time Zones Abbreviations
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.