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.

    

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

        Time Zones Abbreviations
        • 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)

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

book


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

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