2021Calendar of Astronomical Events
2021Phases 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.
| 2021 Phases of the Moon | |||
| Mountain Standard Time | |||
| New Moon | First Quarter | Full Moon | Last Quarter |
| - | - | - | Jan 6 02:37 |
| Jan 12 22:00 | Jan 20 14:02 | Jan 28 12:16 | Feb 4 10:37 |
| Feb 11 12:06 | Feb 19 11:47 | Feb 27 01:17 | Mar 5 18:30 |
| Mar 13 03:21 | Mar 21 07:40 | Mar 28 11:48 | Apr 4 03:02 |
| Apr 11 19:31 | Apr 19 23:59 | Apr 26 20:31 | May 3 12:50 |
| May 11 12:00 | May 19 12:13 | May 26 04:14 t | Jun 2 00:24 |
| Jun 10 03:53 A | Jun 17 20:54 | Jun 24 11:40 | Jul 1 14:11 |
| Jul 9 18:17 | Jul 17 03:11 | Jul 23 19:37 | Jul 31 06:16 |
| Aug 8 06:50 | Aug 15 08:20 | Aug 22 05:02 | Aug 30 00:13 |
| Sep 6 17:52 | Sep 13 13:39 | Sep 20 16:55 | Sep 28 18:57 |
| Oct 6 04:05 | Oct 12 20:25 | Oct 20 07:57 | Oct 28 13:05 |
| Nov 4 14:15 | Nov 11 05:46 | Nov 19 01:58 p | Nov 27 05:28 |
| Dec 4 00:43 T | Dec 10 18:36 | Dec 18 21:36 | Dec 26 19:24 |
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.
2021Calendar 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.
| 2021Calendar of Astronomical Events | ||||||||
| Mountain Standard Time | ||||||||
| January - June | July - December | |||||||
Date MST Event (h:m)Jan 01 00:05 Beehive 2.3°S of Moon 02 07 Earth at Perihelion: 0.98325 AU 02 14:58 Regulus 4.7°S of Moon 03 08 Quadrantid Meteor Shower 06 02:37 LAST QUARTER MOON 09 08:39 Moon at Perigee: 367390 km 09 19:08 Antares 5.6°S of Moon 09 22 Mercury 1.6°S of Saturn 10 13:14 Moon at Descending Node 11 11 Mercury 1.4°S of Jupiter 11 13:12 Venus 1.5°N of Moon 12 22:00 NEW MOON 14 01:15 Mercury 2.3°N of Moon 20 14:02 FIRST QUARTER MOON 20 22:37 Mars 5.1°N of Moon 21 06:11 Moon at Apogee: 404361 km 23 19 Mercury at Greatest Elong: 18.6°E 23 19 Saturn in Conjunction with Sun 23 21:39 Aldebaran 4.7°S of Moon 24 14:47 Moon at Ascending Node 27 08:46 Pollux 3.8°N of Moon 28 07:50 Beehive 2.3°S of Moon 28 12:16 FULL MOON 28 18 Jupiter in Conjunction with Sun 28 19 Mercury at Perihelion 29 21:56 Regulus 4.6°S of MoonFeb 03 12:33 Moon at Perigee: 370127 km 04 10:37 LAST QUARTER MOON 06 01 Venus 0.4°S of Saturn 06 01:33 Antares 5.5°S of Moon 06 17:29 Moon at Descending Node 08 07 Mercury at Inferior Conjunction 11 07 Venus 0.4°S of Jupiter 11 12:06 NEW MOON 13 02 Mercury 4.6°N of Venus 15 07 Mercury 3.8°N of Jupiter 18 03:22 Moon at Apogee: 404467 km 18 15:47 Mars 3.7°N of Moon 19 11:47 FIRST QUARTER MOON 19 22 Venus at Aphelion 20 06:15 Aldebaran 5.0°S of Moon 20 18:44 Moon at Ascending Node 23 01 Mercury 4.0°N of Saturn 23 18:10 Pollux 3.7°N of Moon 24 17:16 Beehive 2.4°S of Moon 26 07:04 Regulus 4.6°S of Moon 27 01:17 FULL MOON Mar 01 22:19 Moon at Perigee: 365422 km 03 16:36 Mars 2.6°S of Pleiades 04 22 Mercury 0.3°N of Jupiter 05 06:58 Antares 5.2°S of Moon 05 17:56 Moon at Descending Node 05 18:30 LAST QUARTER MOON 06 04 Mercury at Greatest Elong: 27.3°W 09 16:02 Saturn 3.7°N of Moon 10 08:35 Jupiter 4.0°N of Moon 10 17 Neptune in Conjunction with Sun 10 18:02 Mercury 3.7°N of Moon 13 03:21 NEW MOON 13 19 Mercury at Aphelion 17 22:04 Moon at Apogee: 405253 km 19 10:48 Mars 1.9°N of Moon 19 14:13 Aldebaran 5.2°S of Moon 19 20:31 Moon at Ascending Node 20 02:37 Vernal Equinox 20 12:15 Mars 6.9°N of Aldebaran 21 07:40 FIRST QUARTER MOON 23 03:26 Pollux 3.5°N of Moon 24 02:58 Beehive 2.6°S of Moon 25 17:17 Regulus 4.7°S of Moon 25 23 Venus at Superior Conjunction 28 11:48 FULL MOON 29 08:52 Spica 6.5°S of Moon 29 23:12 Moon at Perigee: 360311 kmApr 01 13:49 Antares 4.9°S of Moon 01 19:41 Moon at Descending Node 04 03:02 LAST QUARTER MOON 06 01:34 Saturn 4.0°N of Moon 07 00:15 Jupiter 4.4°N of Moon 11 19:31 NEW MOON 14 10:47 Moon at Apogee: 406120 km 15 21:07 Aldebaran 5.4°S of Moon 15 22:53 Moon at Ascending Node 17 05:09 Mars 0.1°N of Moon: Occn. 18 19 Mercury at Superior Conjunction 19 11:18 Pollux 3.2°N of Moon 19 23:59 FIRST QUARTER MOON 20 11:25 Beehive 2.8°S of Moon 22 02:48 Regulus 4.9°S of Moon 22 05 Lyrid Meteor Shower 25 19:43 Spica 6.5°S of Moon 26 18 Mercury at Perihelion 26 20:31 FULL MOON 27 08:24 Moon at Perigee: 357379 km 28 23:07 Antares 4.8°S of Moon 29 02:17 Moon at Descending Node 30 14 Uranus in Conjunction with Sun May 03 10:02 Saturn 4.2°N of Moon 03 12:50 LAST QUARTER MOON 03 20:03 Mercury 2.1°S of Pleiades 04 14:00 Jupiter 4.6°N of Moon 04 18 Eta-Aquarid Meteor Shower 11 12:00 NEW MOON 11 14:54 Moon at Apogee: 406512 km 13 03:29 Moon at Ascending Node 13 10:59 Mercury 2.1°N of Moon 15 21:47 Mars 1.5°S of Moon 16 17:39 Pollux 3.1°N of Moon 16 23 Mercury at Greatest Elong: 22.0°E 17 18:08 Beehive 2.9°S of Moon 19 10:28 Regulus 5.0°S of Moon 19 12:13 FIRST QUARTER MOON 23 06:07 Spica 6.5°S of Moon 25 18:52 Moon at Perigee: 357310 km 26 04:14 FULL MOON 26 04:19 Total Lunar Eclipse; mag=1.009 26 09:55 Antares 4.8°S of Moon 26 12:38 Moon at Descending Node 28 20 Mercury 0.4°S of Venus 30 18:22 Saturn 4.2°N of Moon 31 04:41 Mars 5.2°S of PolluxJun 01 01:57 Jupiter 4.6°N of Moon 02 00:24 LAST QUARTER MOON 07 19:27 Moon at Apogee: 406230 km 09 09:42 Moon at Ascending Node 10 03:42 Annular Solar Eclipse; mag=0.943 10 03:53 NEW MOON 10 18 Mercury at Inferior Conjunction 11 23:44 Venus 1.5°S of Moon 12 06 Venus at Perihelion 12 23:19 Pollux 3.1°N of Moon 13 12:52 Mars 2.8°S of Moon 13 23:47 Beehive 2.9°S of Moon 15 16:28 Regulus 5.0°S of Moon 17 20:54 FIRST QUARTER MOON 20 20:32 Summer Solstice 21 08:57 Venus 5.1°S of Pollux 22 13:36 Mercury 1.8°N of Aldebaran 22 20:26 Antares 4.8°S of Moon 22 22:21 Mars 0.3°S of Beehive 22 23:07 Moon at Descending Node 23 02:58 Moon at Perigee: 359960 km 24 11:40 FULL MOON 27 02:30 Saturn 4.0°N of Moon 28 11:38 Jupiter 4.5°N of Moon | Date MST Event (h:m)Jul 01 14:11 LAST QUARTER MOON 02 19:45 Venus 0.1°N of Beehive 04 13 Mercury at Greatest Elong: 21.6°W 05 07:48 Moon at Apogee: 405342 km 05 16 Earth at Aphelion: 1.01673 AU 06 15:41 Moon at Ascending Node 06 15:52 Aldebaran 5.5°S of Moon 07 21:38 Mercury 3.7°S of Moon 09 18:17 NEW MOON 12 02:10 Venus 3.3°S of Moon 12 03:10 Mars 3.8°S of Moon 12 17 Mars at Aphelion: 1.66596 AU 12 22:02 Regulus 4.9°S of Moon 13 06 Venus 0.5°N of Mars 16 21:01 Spica 6.4°S of Moon 17 03:11 FIRST QUARTER MOON 20 05:06 Antares 4.7°S of Moon 20 06:22 Moon at Descending Node 21 03:30 Moon at Perigee: 364520 km 21 14:21 Venus 1.0°N of Regulus 23 18 Mercury at Perihelion 23 19:37 FULL MOON 24 09:42 Saturn 3.8°N of Moon 25 18:17 Jupiter 4.2°N of Moon 27 20 Delta-Aquarid Meteor Shower 29 07:09 Mars 0.6°N of Regulus 31 06:16 LAST QUARTER MOON Aug 01 07 Mercury at Superior Conjunction 01 22 Saturn at Opposition 02 00:35 Moon at Apogee: 404412 km 02 19:51 Moon at Ascending Node 02 23:18 Aldebaran 5.7°S of Moon 06 12:42 Pollux 3.1°N of Moon 08 06:50 NEW MOON 11 00:00 Venus 4.3°S of Moon 12 12 Perseid Meteor Shower 13 02:31 Spica 6.1°S of Moon 15 08:20 FIRST QUARTER MOON 16 09:04 Moon at Descending Node 16 11:34 Antares 4.5°S of Moon 17 02:23 Moon at Perigee: 369127 km 18 20 Mercury 0.1°S of Mars 19 16 Jupiter at Opposition 20 15:19 Saturn 3.7°N of Moon 21 21:52 Jupiter 4.0°N of Moon 22 05:02 FULL MOON 29 19:22 Moon at Apogee: 404100 km 29 22:13 Moon at Ascending Node 30 00:13 LAST QUARTER MOON Sep 02 21:04 Pollux 3.0°N of Moon 03 21:07 Beehive 2.9°S of Moon 05 07:32 Venus 1.4°N of Spica 05 17 Mercury at Aphelion 06 17:52 NEW MOON 09 09:01 Spica 5.9°S of Moon 09 19:09 Venus 4.1°S of Moon 11 03:05 Moon at Perigee: 368464 km 12 09:35 Moon at Descending Node 12 16:59 Antares 4.2°S of Moon 13 13:39 FIRST QUARTER MOON 13 21 Mercury at Greatest Elong: 26.8°E 14 01 Neptune at Opposition 16 19:37 Saturn 3.8°N of Moon 17 23:50 Jupiter 4.0°N of Moon 20 16:55 FULL MOON 20 19:00 Mercury 1.2°S of Spica 22 12:21 Autumnal Equinox 26 00:33 Moon at Ascending Node 26 14:44 Moon at Apogee: 404641 km 28 18:57 LAST QUARTER MOON 30 05:44 Pollux 2.8°N of MoonOct 01 06:07 Beehive 3.1°S of Moon 02 15 Venus at Aphelion 02 22:12 Regulus 4.9°S of Moon 06 04:05 NEW MOON 07 21 Mars in Conjunction with Sun 08 10:28 Moon at Perigee: 363388 km 09 09 Mercury at Inferior Conjunction 09 11:36 Venus 2.9°S of Moon 09 12:35 Moon at Descending Node 09 23:27 Antares 4.0°S of Moon 12 20:25 FIRST QUARTER MOON 14 00:12 Saturn 3.9°N of Moon 15 02:58 Jupiter 4.1°N of Moon 16 06:24 Venus 1.4°N of Antares 19 17 Mercury at Perihelion 20 07:57 FULL MOON 21 04 Orionid Meteor Shower 23 04:47 Moon at Ascending Node 24 08:30 Moon at Apogee: 405616 km 24 22 Mercury at Greatest Elong: 18.4°W 27 13:40 Pollux 2.6°N of Moon 28 13:05 LAST QUARTER MOON 28 14:32 Beehive 3.3°S of Moon 29 15 Venus at Greatest Elong: 47.0°E 30 07:33 Regulus 5.1°S of MoonNov 01 18:18 Mercury 3.7°N of Spica 03 11:40 Mercury 1.2°S of Moon: Occn. 04 14:15 NEW MOON 04 17 Uranus at Opposition 05 05 S Taurid Meteor Shower 05 15:23 Moon at Perigee: 358845 km 05 20:38 Moon at Descending Node 06 08:29 Antares 3.9°S of Moon 07 22:21 Venus 1.1°S of Moon: Occn. 10 07:27 Saturn 4.1°N of Moon 10 08 Mercury 1.0°N of Mars 11 05:46 FIRST QUARTER MOON 11 10:13 Jupiter 4.4°N of Moon 12 04 N Taurid Meteor Shower 17 11 Leonid Meteor Shower 19 01:58 FULL MOON 19 02:03 Partial Lunar Eclipse; mag=0.974 19 10:59 Moon at Ascending Node 20 19:14 Moon at Apogee: 406276 km 23 20:22 Pollux 2.5°N of Moon 24 21:32 Beehive 3.3°S of Moon 26 15:27 Regulus 5.2°S of Moon 27 05:28 LAST QUARTER MOON 28 22 Mercury at Superior Conjunction 30 15:04 Spica 5.9°S of MoonDec 03 07:58 Moon at Descending Node 04 00:33 Total Solar Eclipse; mag=1.037 04 00:43 NEW MOON 04 03:01 Moon at Perigee: 356794 km 06 17:48 Venus 1.9°N of Moon 07 18:52 Saturn 4.2°N of Moon 08 23:07 Jupiter 4.5°N of Moon 10 18:36 FIRST QUARTER MOON 14 00 Geminid Meteor Shower 16 17:12 Moon at Ascending Node 17 19:16 Moon at Apogee: 406322 km 18 21:36 FULL MOON 21 02:20 Pollux 2.6°N of Moon 21 08:59 Winter Solstice 22 03:28 Beehive 3.3°S of Moon 22 08 Ursid Meteor Shower 23 21:40 Regulus 5.1°S of Moon 26 19:24 LAST QUARTER MOON 27 02:15 Mars 4.4°N of Antares 27 23:58 Spica 5.8°S of Moon 28 22 Mercury 4.2°S of Venus 30 18:07 Moon at Descending Node 31 06:54 Antares 3.9°S of Moon 31 13:13 Mars 1.0°N of Moon: Occn. | |||||||
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.