2021 Sky Event Almanac
Argentina Time
The following table gives the date and time of the important astronomical events for the year . The times listed are for Argentina Time (Coordinated Universal Time − 3 hours) . This time zone may have different names in different countries. If Daylight Saving Time is in effect, add one hour to the times listed. A key to astronomical terms appears below the almanac.
| 2021 Sky Event Almanac | ||||||||
| Argentina Time | ||||||||
| January - June | July - December | |||||||
Date ART Event
(h:m)
Jan 02 11 Earth at Perihelion: 0.98325 AU
02 18:58 Regulus 4.7°S of Moon
03 12 Quadrantid Meteor Shower
06 06:37 LAST QUARTER MOON
09 12:39 Moon at Perigee: 367390 km
10 17:14 Moon at Descending Node
11 17:12 Venus 1.5°N of Moon
13 02:00 NEW MOON
14 05:15 Mercury 2.3°N of Moon
20 18:02 FIRST QUARTER MOON
21 10:11 Moon at Apogee: 404361 km
23 23 Mercury at Greatest Elong: 18.6°E
23 23 Saturn in Conjunction with Sun
24 18:47 Moon at Ascending Node
27 12:46 Pollux 3.8°N of Moon
28 16:16 FULL MOON
28 22 Jupiter in Conjunction with Sun
28 23 Mercury at Perihelion
30 01:56 Regulus 4.6°S of Moon
Feb 03 16:33 Moon at Perigee: 370127 km
04 14:37 LAST QUARTER MOON
06 21:29 Moon at Descending Node
08 11 Mercury at Inferior Conjunction
10 08:16 Saturn 3.4°N of Moon
11 16:06 NEW MOON
18 07:22 Moon at Apogee: 404467 km
18 19:47 Mars 3.7°N of Moon
19 15:47 FIRST QUARTER MOON
20 02 Venus at Aphelion
20 22:44 Moon at Ascending Node
23 05 Mercury 4.0°N of Saturn
23 22:10 Pollux 3.7°N of Moon
26 11:04 Regulus 4.6°S of Moon
27 05:17 FULL MOON
Mar 02 02:19 Moon at Perigee: 365422 km
03 20:36 Mars 2.6°S of Pleiades
05 02 Mercury 0.3°N of Jupiter
05 21:56 Moon at Descending Node
05 22:30 LAST QUARTER MOON
06 08 Mercury at Greatest Elong: 27.3°W
09 20:02 Saturn 3.7°N of Moon
10 12:35 Jupiter 4.0°N of Moon
10 21 Neptune in Conjunction with Sun
10 22:02 Mercury 3.7°N of Moon
13 07:21 NEW MOON
13 23 Mercury at Aphelion
18 02:04 Moon at Apogee: 405253 km
19 14:48 Mars 1.9°N of Moon
20 00:31 Moon at Ascending Node
20 06:37 Vernal Equinox
21 11:40 FIRST QUARTER MOON
23 07:26 Pollux 3.5°N of Moon
25 21:17 Regulus 4.7°S of Moon
26 03 Venus at Superior Conjunction
28 15:48 FULL MOON
30 03:12 Moon at Perigee: 360311 km
Apr 01 17:49 Antares 4.9°S of Moon
01 23:41 Moon at Descending Node
04 07:02 LAST QUARTER MOON
06 05:34 Saturn 4.0°N of Moon
07 04:15 Jupiter 4.4°N of Moon
11 23:31 NEW MOON
14 14:47 Moon at Apogee: 406120 km
16 02:53 Moon at Ascending Node
17 09:09 Mars 0.1°N of Moon: Occn.
18 23 Mercury at Superior Conjunction
19 15:18 Pollux 3.2°N of Moon
20 03:59 FIRST QUARTER MOON
22 09 Lyrid Meteor Shower
26 22 Mercury at Perihelion
27 00:31 FULL MOON
27 12:24 Moon at Perigee: 357379 km
29 03:07 Antares 4.8°S of Moon
29 06:17 Moon at Descending Node
30 18 Uranus in Conjunction with Sun
May 03 14:02 Saturn 4.2°N of Moon
03 16:50 LAST QUARTER MOON
04 00:03 Mercury 2.1°S of Pleiades
04 18:00 Jupiter 4.6°N of Moon
04 22 Eta-Aquarid Meteor Shower
11 16:00 NEW MOON
11 18:54 Moon at Apogee: 406512 km
13 07:29 Moon at Ascending Node
13 14:59 Mercury 2.1°N of Moon
16 01:47 Mars 1.5°S of Moon
16 21:39 Pollux 3.1°N of Moon
17 03 Mercury at Greatest Elong: 22.0°E
19 16:13 FIRST QUARTER MOON
25 22:52 Moon at Perigee: 357310 km
26 08:14 FULL MOON
26 08:19 Total Lunar Eclipse; mag=1.009
26 13:55 Antares 4.8°S of Moon
26 16:38 Moon at Descending Node
29 00 Mercury 0.4°S of Venus
30 22:22 Saturn 4.2°N of Moon
Jun 01 05:57 Jupiter 4.6°N of Moon
02 04:24 LAST QUARTER MOON
07 23:27 Moon at Apogee: 406230 km
09 13:42 Moon at Ascending Node
10 07:42 Annular Solar Eclipse; mag=0.943
10 07:53 NEW MOON
10 22 Mercury at Inferior Conjunction
12 03:44 Venus 1.5°S of Moon
12 10 Venus at Perihelion
13 03:19 Pollux 3.1°N of Moon
13 16:52 Mars 2.8°S of Moon
18 00:54 FIRST QUARTER MOON
21 00:32 Summer Solstice
23 00:26 Antares 4.8°S of Moon
23 03:07 Moon at Descending Node
23 06:58 Moon at Perigee: 359960 km
24 15:40 FULL MOON
27 06:30 Saturn 4.0°N of Moon
28 15:38 Jupiter 4.5°N of Moon
|
Date ART Event
(h:m)
Jul 01 18:11 LAST QUARTER MOON
04 17 Mercury at Greatest Elong: 21.6°W
05 11:48 Moon at Apogee: 405342 km
05 20 Earth at Aphelion: 1.01673 AU
06 19:41 Moon at Ascending Node
08 01:38 Mercury 3.7°S of Moon
09 22:17 NEW MOON
12 06:10 Venus 3.3°S of Moon
12 07:10 Mars 3.8°S of Moon
12 21 Mars at Aphelion: 1.66596 AU
13 10 Venus 0.5°N of Mars
17 07:11 FIRST QUARTER MOON
20 09:06 Antares 4.7°S of Moon
20 10:22 Moon at Descending Node
21 07:30 Moon at Perigee: 364520 km
21 18:21 Venus 1.0°N of Regulus
23 22 Mercury at Perihelion
23 23:37 FULL MOON
24 13:42 Saturn 3.8°N of Moon
25 22:17 Jupiter 4.2°N of Moon
28 00 Delta-Aquarid Meteor Shower
29 11:09 Mars 0.6°N of Regulus
31 10:16 LAST QUARTER MOON
Aug 01 11 Mercury at Superior Conjunction
02 02 Saturn at Opposition
02 04:35 Moon at Apogee: 404412 km
02 23:51 Moon at Ascending Node
06 16:42 Pollux 3.1°N of Moon
08 10:50 NEW MOON
09 21:42 Mars 4.3°S of Moon
11 04:00 Venus 4.3°S of Moon
12 16 Perseid Meteor Shower
15 12:20 FIRST QUARTER MOON
16 13:04 Moon at Descending Node
16 15:34 Antares 4.5°S of Moon
17 06:23 Moon at Perigee: 369127 km
19 00 Mercury 0.1°S of Mars
19 20 Jupiter at Opposition
20 19:19 Saturn 3.7°N of Moon
22 01:52 Jupiter 4.0°N of Moon
22 09:02 FULL MOON
29 23:22 Moon at Apogee: 404100 km
30 02:13 Moon at Ascending Node
30 04:13 LAST QUARTER MOON
Sep 03 01:04 Pollux 3.0°N of Moon
05 11:32 Venus 1.4°N of Spica
05 21 Mercury at Aphelion
06 21:52 NEW MOON
09 23:09 Venus 4.1°S of Moon
11 07:05 Moon at Perigee: 368464 km
12 13:35 Moon at Descending Node
12 20:59 Antares 4.2°S of Moon
13 17:39 FIRST QUARTER MOON
14 01 Mercury at Greatest Elong: 26.8°E
14 05 Neptune at Opposition
16 23:37 Saturn 3.8°N of Moon
18 03:50 Jupiter 4.0°N of Moon
20 20:55 FULL MOON
20 23:00 Mercury 1.2°S of Spica
22 16:21 Autumnal Equinox
26 04:33 Moon at Ascending Node
26 18:44 Moon at Apogee: 404641 km
28 22:57 LAST QUARTER MOON
30 09:44 Pollux 2.8°N of Moon
Oct 02 19 Venus at Aphelion
06 08:05 NEW MOON
08 01 Mars in Conjunction with Sun
08 14:28 Moon at Perigee: 363388 km
09 13 Mercury at Inferior Conjunction
09 15:36 Venus 2.9°S of Moon
09 16:35 Moon at Descending Node
10 03:27 Antares 4.0°S of Moon
13 00:25 FIRST QUARTER MOON
14 04:12 Saturn 3.9°N of Moon
15 06:58 Jupiter 4.1°N of Moon
16 10:24 Venus 1.4°N of Antares
19 21 Mercury at Perihelion
20 11:57 FULL MOON
21 08 Orionid Meteor Shower
23 02:45 Pleiades 4.5°N of Moon
23 08:47 Moon at Ascending Node
24 12:30 Moon at Apogee: 405616 km
25 02 Mercury at Greatest Elong: 18.4°W
27 17:40 Pollux 2.6°N of Moon
28 17:05 LAST QUARTER MOON
29 19 Venus at Greatest Elong: 47.0°E
Nov 01 22:18 Mercury 3.7°N of Spica
03 15:40 Mercury 1.2°S of Moon: Occn.
04 18:15 NEW MOON
04 21 Uranus at Opposition
05 09 S Taurid Meteor Shower
05 19:23 Moon at Perigee: 358845 km
06 00:38 Moon at Descending Node
06 12:29 Antares 3.9°S of Moon
08 02:21 Venus 1.1°S of Moon: Occn.
10 11:27 Saturn 4.1°N of Moon
11 09:46 FIRST QUARTER MOON
11 14:13 Jupiter 4.4°N of Moon
12 08 N Taurid Meteor Shower
17 15 Leonid Meteor Shower
19 05:58 FULL MOON
19 06:03 Partial Lunar Eclipse; mag=0.974
19 09:21 Pleiades 4.5°N of Moon
19 14:59 Moon at Ascending Node
20 23:14 Moon at Apogee: 406276 km
24 00:22 Pollux 2.5°N of Moon
27 09:28 LAST QUARTER MOON
29 02 Mercury at Superior Conjunction
Dec 02 21:28 Mars 0.7°S of Moon: Occn.
03 11:58 Moon at Descending Node
04 04:33 Total Solar Eclipse; mag=1.037
04 04:43 NEW MOON
04 07:01 Moon at Perigee: 356794 km
06 21:48 Venus 1.9°N of Moon
07 22:52 Saturn 4.2°N of Moon
09 03:07 Jupiter 4.5°N of Moon
10 22:36 FIRST QUARTER MOON
14 04 Geminid Meteor Shower
16 15:30 Pleiades 4.5°N of Moon
16 21:12 Moon at Ascending Node
17 23:16 Moon at Apogee: 406322 km
19 01:36 FULL MOON
21 06:20 Pollux 2.6°N of Moon
21 12:59 Winter Solstice
22 12 Ursid Meteor Shower
26 23:24 LAST QUARTER MOON
27 06:15 Mars 4.4°N of Antares
29 02 Mercury 4.2°S of Venus
30 22:07 Moon at Descending Node
31 10:54 Antares 3.9°S of Moon
31 17:13 Mars 1.0°N of Moon: Occn.
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Terms Used in Sky Event Almanac
- 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
2021 Phases of the Moon
Argentina Time
The following table gives the date and time of the Moon's phases for the year . The times listed are for Argentina Time (Coordinated Universal Time − 3 hours) . This time zone may have different names in different countries. If Daylight Saving Time is in effect, add one hour to the times listed.
| 2021 Phases of the Moon | |||
| Argentina Time | |||
| New Moon | First Quarter | Full Moon | Last Quarter |
| - | - | - | Jan 06 06:37 |
| Jan 13 02:00 | Jan 20 18:02 | Jan 28 16:16 | Feb 04 14:37 |
| Feb 11 16:06 | Feb 19 15:47 | Feb 27 05:17 | Mar 05 22:30 |
| Mar 13 07:21 | Mar 21 11:40 | Mar 28 15:48 | Apr 04 07:02 |
| Apr 11 23:31 | Apr 20 03:59 | Apr 27 00:31 | May 03 16:50 |
| May 11 16:00 | May 19 16:13 | May 26 08:14 t | Jun 02 04:24 |
| Jun 10 07:53 A | Jun 18 00:54 | Jun 24 15:40 | Jul 01 18:11 |
| Jul 09 22:17 | Jul 17 07:11 | Jul 23 23:37 | Jul 31 10:16 |
| Aug 08 10:50 | Aug 15 12:20 | Aug 22 09:02 | Aug 30 04:13 |
| Sep 06 21:52 | Sep 13 17:39 | Sep 20 20:55 | Sep 28 22:57 |
| Oct 06 08:05 | Oct 13 00:25 | Oct 20 11:57 | Oct 28 17:05 |
| Nov 04 18:15 | Nov 11 09:46 | Nov 19 05:58 p | Nov 27 09:28 |
| Dec 04 04:43 T | Dec 10 22:36 | Dec 19 01:36 | Dec 26 23:24 |
For a collection of images showing the Moon's phases see: Phases of the Moon Photo Gallery.
The Phases of the Moon table also shows when an eclipse takes place. 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 Phases of the Moon table. 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.
Solar Eclipses
The following table contains links to a series of web pages covering the 21st Century. Each one summarizes ten years of solar eclipses. Every eclipse has links to a global visibility map, an interactive Google map, tables, and additional information.
| Decade Pages of Solar Eclipses | |||||
| Decades | |||||
|---|---|---|---|---|---|
| 2001-2010 | 2011-2020 | 2021-2030 | 2031-2040 | 2041-2050 | |
| 2051-2060 | 2061-2070 | 2071-2080 | 2081-2090 | 2091-2100 | |
Lunar Eclipses
The following table contains links to a series of web pages covering the 21st Century. Each one summarizes ten years of lunar eclipses. Every eclipse has links to an eclipse diagram, a global visibility map, tables, and additional information.
| Decade Pages of Lunar Eclipses | |||||
| Decades | |||||
|---|---|---|---|---|---|
| 2001-2010 | 2011-2020 | 2021-2030 | 2031-2040 | 2041-2050 | |
| 2051-2060 | 2061-2070 | 2071-2080 | 2081-2090 | 2091-2100 | |
Sky Event Almanacs: 2021 to 2030
The Americas
Below are links to sky event almanacs from 2021 to 2030 for eight time zones in the Americas.
Choose a time zone and click on a year to get a sky event almanac for that year.
| Sky Event Almanacs - The Americas | |||||||||||||||
| ART | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 | 2027 | 2028 | 2029 | 2030 | |||||
| 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 | |||||
- ART = Argentina Time (= UTC - 3 hours)
- AST = Atlantic Standard Time (= UTC - 4 hours)
- EST = Eastern Standard Time (= UTC - 5 hours)
- CST = Central Standard Time (= UTC - 6 hours)
- MST = Mountain Standard Time (= UTC - 7 hours)
- PST = Pacific Standard Time (= UTC - 8 hours)
- AKST = Alaskan Standard Time (= UTC - 9 hours)
- HST = Hawaiian Standard Time (= UTC - 10 hours)
(where UTC = Coordinated Universal 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 Coordinated Universal Time to help in identification.
For other years and other time zones, visit: Sky Event Almanacs.
Accuracy of the Sky Event Almanacs
The goal of the Sky Event Almanacs 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 Sky Event Almanacs | |
| 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 |
Fifty Year Almanac of Astronomical Events - 2021 to 2070
For more information and sample pages, see Fifty Year Almanac of Astronomical Events - 2021 To 2070.
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:
- "Sky Event Almanacs Courtesy of Fred Espenak, www.AstroPixels.com".
Return to: Sky Event Almanacs
Return to: Planetary Ephemeris Data
Useful External Links
Interactive Sky Chart (Sky and Telescope)
Sky Maps (sky-map.org)
Astronomical Almanac (Sky and Telescope)
Weather Forecast for Astronomy (Clear Outside)
GOES-East Images (NOAA-GOES)
Astronomy Tools (Astronomy Tools)