2021 Sky Event Almanac

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 (Coordinated Universal Time − 7 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
Mountain Standard Time
January - June July - December
Date     MST   Event
        (h:m)

Jan 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
    10  13:14  Moon at Descending Node 
    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 
    21  06:11  Moon at Apogee: 404361 km
    23  19     Mercury at Greatest Elong: 18.6°E
    23  19     Saturn in Conjunction with Sun 
    24  14:47  Moon at Ascending Node 
    27  08:46  Pollux 3.8°N 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 Moon

Feb 03  12:33  Moon at Perigee: 370127 km
    04  10:37  LAST QUARTER MOON 
    06  17:29  Moon at Descending Node 
    08  07     Mercury at Inferior Conjunction 
    10  04:16  Saturn 3.4°N of Moon
    11  12:06  NEW MOON 
    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  18:44  Moon at Ascending Node 
    23  01     Mercury 4.0°N of Saturn
    23  18:10  Pollux 3.7°N 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  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  20:31  Moon at Ascending Node 
    20  02:37  Vernal Equinox 
    21  07:40  FIRST QUARTER MOON 
    23  03:26  Pollux 3.5°N of Moon
    25  17:17  Regulus 4.7°S of Moon
    25  23     Venus at Superior Conjunction 
    28  11:48  FULL MOON 
    29  23:12  Moon at Perigee: 360311 km

Apr 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  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 
    22  05     Lyrid Meteor Shower
    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
    19  12:13  FIRST QUARTER 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

Jun 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
    17  20:54  FIRST QUARTER MOON 
    20  20:32  Summer Solstice 
    22  20:26  Antares 4.8°S of Moon
    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 
    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 
    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
    13  06     Venus 0.5°N of Mars
    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 
    06  12:42  Pollux 3.1°N of Moon
    08  06:50  NEW MOON 
    09  17:42  Mars 4.3°S of Moon
    11  00:00  Venus 4.3°S of Moon
    12  12     Perseid Meteor Shower
    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
    05  07:32  Venus 1.4°N of Spica
    05  17     Mercury at Aphelion 
    06  17:52  NEW 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 Moon

Oct 02  15     Venus at Aphelion 
    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
    22  22:45  Pleiades 4.5°N of Moon
    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 
    29  15     Venus at Greatest Elong: 47.0°E

Nov 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
    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  05:21  Pleiades 4.5°N of Moon
    19  10:59  Moon at Ascending Node 
    20  19:14  Moon at Apogee: 406276 km
    23  20:22  Pollux 2.5°N of Moon
    27  05:28  LAST QUARTER MOON 
    28  22     Mercury at Superior Conjunction 

Dec 02  17:28  Mars 0.7°S of Moon: Occn.
    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  11:30  Pleiades 4.5°N of Moon
    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  08     Ursid Meteor Shower
    26  19:24  LAST QUARTER MOON 
    27  02:15  Mars 4.4°N of Antares
    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 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

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 (Coordinated Universal Time − 7 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
Mountain Standard Time
New Moon First Quarter Full Moon Last Quarter
--- Jan 06 02:37
Jan 12 22:00 Jan 20 14:02 Jan 28 12:16 Feb 04 10:37
Feb 11 12:06 Feb 19 11:47 Feb 27 01:17 Mar 05 18:30
Mar 13 03:21 Mar 21 07:40 Mar 28 11:48 Apr 04 03:02
Apr 11 19:31 Apr 19 23:59 Apr 26 20:31 May 03 12:50
May 11 12:00 May 19 12:13 May 26 04:14 t Jun 02 00:24
Jun 10 03:53 A Jun 17 20:54 Jun 24 11:40 Jul 01 14:11
Jul 09 18:17 Jul 17 03:11 Jul 23 19:37 Jul 31 06:16
Aug 08 06:50 Aug 15 08:20 Aug 22 05:02 Aug 30 00:13
Sep 06 17:52 Sep 13 13:39 Sep 20 16:55 Sep 28 18:57
Oct 06 04:05 Oct 12 20:25 Oct 20 07:57 Oct 28 13:05
Nov 04 14:15 Nov 11 05:46 Nov 19 01:58 p Nov 27 05:28
Dec 04 00:43 T Dec 10 18:36 Dec 18 21:36 Dec 26 19:24

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

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)