2011 Calendar of Astronomical Events



2011 Phases of the Moon

Atlantic Standard Time

The following table gives the date and time of the Moon's phases for the year. If Daylight Saving Time is in effect, add one hour to the times listed.

2011 Phases of the Moon
Atlantic Standard Time
New Moon First Quarter Full Moon Last Quarter
Jan 4 05:03 P Jan 12 07:31 Jan 19 17:21 Jan 26 08:57
Feb 2 22:31 Feb 11 03:18 Feb 18 04:36 Feb 24 19:26
Mar 4 16:46 Mar 12 19:45 Mar 19 14:10 Mar 26 08:07
Apr 3 10:32 Apr 11 08:05 Apr 17 22:44 Apr 24 22:47
May 3 02:51 May 10 16:33 May 17 07:09 May 24 14:52
Jun 1 17:03 P Jun 8 22:11 Jun 15 16:13 t Jun 23 07:48
Jul 1 04:54 P Jul 8 02:29 Jul 15 02:40 Jul 23 01:02
Jul 30 14:40 Aug 6 07:08 Aug 13 14:58 Aug 21 17:55
Aug 28 23:04 Sep 4 13:39 Sep 12 05:27 Sep 20 09:39
Sep 27 07:09 Oct 3 23:15 Oct 11 22:06 Oct 19 23:30
Oct 26 15:56 Nov 2 12:38 Nov 10 16:16 Nov 18 11:09
Nov 25 02:10 P Dec 2 05:52 Dec 10 10:36 t Dec 17 20:48
Dec 24 14:06 ---

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.



2011 Calendar of Astronomical Events

Atlantic Standard Time

The following table gives the date and time of the important astronomical events for the year. If Daylight Saving Time is in effect, add one hour to the times listed. A key to astronomical terms appears below the calendar.

2011 Calendar of Astronomical Events
January - June July - December
Date     AST   Event
        (h:m)

Jan 01  14:07  Antares 2.5°S of Moon
    02  10:32  Mercury 3.8°N of Moon
    03  08:48  Moon at Ascending Node 
    03  15     Earth at Perihelion: 0.98334 AU
    03  21     Quadrantid Meteor Shower
    04  04:51  Partial Solar Eclipse; mag=0.858
    04  05:03  NEW MOON 
    08  11     Venus at Greatest Elong: 47.0°W
    09  10     Mercury at Greatest Elong: 23.3°W
    10  01:38  Moon at Apogee: 404976 km
    12  07:31  FIRST QUARTER MOON 
    15  08:39  Pleiades 1.3°N of Moon
    17  20:06  Moon at Descending Node 
    19  17:21  FULL MOON 
    21  20:10  Moon at Perigee: 362793 km
    21  21:55  Regulus 5.3°N of Moon
    25  13:38  Spica 3.0°N of Moon
    26  08:57  LAST QUARTER MOON 
    28  19:53  Antares 2.6°S of Moon
    29  23:36  Venus 3.5°N of Moon
    30  14:29  Moon at Ascending Node 
    31  05     Mercury at Aphelion 

Feb 01  14:14  Mercury 3.6°S of Moon
    02  22:31  NEW MOON 
    04  13     Mars in Conjunction with Sun 
    06  19:13  Moon at Apogee: 405924 km
    11  03:18  FIRST QUARTER MOON 
    11  17:32  Pleiades 1.4°N of Moon
    14  04:14  Moon at Descending Node 
    17  05     Neptune in Conjunction with Sun 
    18  04:36  FULL MOON 
    18  08:18  Regulus 5.2°N of Moon
    19  03:27  Moon at Perigee: 358247 km
    21  21:02  Spica 2.8°N of Moon
    24  19:26  LAST QUARTER MOON 
    25  01:26  Antares 2.8°S of Moon
    25  04     Mercury at Superior Conjunction 
    26  16:19  Moon at Ascending Node 
    28  23:40  Venus 1.6°S of Moon

Mar 04  16:46  NEW MOON 
    06  03:50  Moon at Apogee: 406584 km
    09  08     Mars at Perihelion 
    11  00:35  Pleiades 1.7°N of Moon
    12  19:45  FIRST QUARTER MOON 
    13  07:55  Moon at Descending Node 
    15  16     Mercury 2.0° of Jupiter
    16  04     Mercury at Perihelion 
    16  07     Jupiter at Perihelion 
    17  19:35  Regulus 5.3°N of Moon
    19  14:10  FULL MOON 
    19  15:09  Moon at Perigee: 356578 km
    20  19:21  Vernal Equinox 
    21  07:00  Spica 2.6°N of Moon
    21  08     Uranus in Conjunction with Sun 
    22  21     Mercury at Greatest Elong: 18.6°E
    24  08:48  Antares 3.0°S of Moon
    25  17:09  Moon at Ascending Node 
    26  08:07  LAST QUARTER MOON 

Apr 02  05:00  Moon at Apogee: 406656 km
    03  10:32  NEW MOON 
    03  19     Saturn at Opposition 
    06  11     Jupiter in Conjunction with Sun 
    07  06:19  Pleiades 1.9°N of Moon
    09  08:48  Moon at Descending Node 
    09  15     Mercury at Inferior Conjunction 
    11  08:05  FIRST QUARTER MOON 
    14  05:34  Regulus 5.5°N of Moon
    17  01:59  Moon at Perigee: 358088 km
    17  18:04  Spica 2.5°N of Moon
    17  22:44  FULL MOON 
    18  20     Venus at Aphelion 
    19  14     Mercury 0.6° of Mars
    20  18:21  Antares 3.2°S of Moon
    21  21:05  Moon at Ascending Node 
    22  19     Lyrid Meteor Shower
    24  22:47  LAST QUARTER MOON 
    29  14:02  Moon at Apogee: 406043 km

May 03  02:51  NEW MOON 
    05  08     Eta-Aquarid Meteor Shower
    06  10:54  Moon at Descending Node 
    07  15     Mercury at Greatest Elong: 26.6°W
    08  01     Mercury 1.4° of Venus
    10  16:33  FIRST QUARTER MOON 
    11  13:05  Regulus 5.7°N of Moon
    11  16     Mercury 2.1° of Jupiter
    15  04:08  Spica 2.6°N of Moon
    15  07:18  Moon at Perigee: 362133 km
    17  07:09  FULL MOON 
    18  03     Mercury 1.4° of Venus
    18  04:46  Antares 3.3°S of Moon
    19  05:03  Moon at Ascending Node 
    21  04     Mercury 2.1° of Mars
    24  14:52  LAST QUARTER MOON 
    27  05:58  Moon at Apogee: 405006 km
    29  10:31  Jupiter 5.7°S of Moon
    30  16:04  Mars 3.8°S of Moon
    31  00:00  Venus 4.4°S of Moon

Jun 01  17:03  NEW MOON 
    01  17:16  Partial Solar Eclipse; mag=0.601
    02  16:21  Moon at Descending Node 
    07  18:45  Regulus 5.7°N of Moon
    08  22:11  FIRST QUARTER MOON 
    09  10:50  Venus 5.0°S of Pleiades
    11  11:57  Spica 2.6°N of Moon
    11  21:42  Moon at Perigee: 367188 km
    12  04     Mercury at Perihelion 
    12  19     Mercury at Superior Conjunction 
    14  14:17  Antares 3.3°S of Moon
    15  14:35  Moon at Ascending Node 
    15  16:13  Total Lunar Eclipse; mag=1.700
    15  16:13  FULL MOON 
    17  08:15  Venus 4.6°N of Aldebaran
    20  21:24  Mars 4.2°S of Pleiades
    21  13:16  Summer Solstice 
    23  07:48  LAST QUARTER MOON 
    24  00:13  Moon at Apogee: 404275 km
    26  04:45  Jupiter 5.4°S of Moon
    28  02:52  Pleiades 2.0°N of Moon
    28  03:40  Mercury 4.7°S of Pollux
    28  14:59  Mars 1.7°S of Moon
    30  00:14  Moon at Descending Node 

Date     AST   Event
        (h:m)

Jul 01  04:38  Partial Solar Eclipse; mag=0.097
    01  04:54  NEW MOON 
    02  22:11  Mercury 5.1°N of Moon
    04  11     Earth at Aphelion: 1.01674 AU
    04  15:18  Mars 5.4°N of Aldebaran
    05  00:23  Regulus 5.7°N of Moon
    06  13:36  Mercury 0.2°S of Beehive
    07  10:04  Moon at Perigee: 369566 km
    08  02:29  FIRST QUARTER MOON 
    08  17:44  Spica 2.6°N of Moon
    11  21:48  Antares 3.3°S of Moon
    12  22:27  Moon at Ascending Node 
    15  02:40  FULL MOON 
    20  01     Mercury at Greatest Elong: 26.8°E
    21  18:46  Moon at Apogee: 404358 km
    23  01:02  LAST QUARTER MOON 
    23  20:34  Jupiter 5.1°S of Moon
    25  11:28  Pleiades 2.1°N of Moon
    26  03     Mercury at Aphelion 
    26  08:51  Mercury 2.1°S of Regulus
    27  08:03  Moon at Descending Node 
    27  12:52  Mars 0.5°N of Moon: Occn.
    28  10     Delta-Aquarid Meteor Shower
    30  14:40  NEW MOON 

Aug 01  07:20  Mercury 1.5°N of Moon
    01  07:41  Regulus 5.6°N of Moon
    02  16:59  Moon at Perigee: 365756 km
    04  23:08  Spica 2.4°N of Moon
    06  07:08  FIRST QUARTER MOON 
    08  03:32  Antares 3.5°S of Moon
    09  02:35  Moon at Ascending Node 
    09  04     Venus at Perihelion 
    13  02     Perseid Meteor Shower
    13  14:58  FULL MOON 
    16  08     Venus at Superior Conjunction 
    16  21     Mercury at Inferior Conjunction 
    18  12:23  Moon at Apogee: 405161 km
    20  08:13  Jupiter 4.8°S of Moon
    21  17:55  LAST QUARTER MOON 
    21  19:40  Pleiades 2.3°N of Moon
    22  18     Neptune at Opposition 
    23  13:23  Moon at Descending Node 
    25  09:36  Mars 2.7°N of Moon
    27  21:07  Mercury 2.6°N of Moon
    28  23:04  NEW MOON 
    30  13:35  Moon at Perigee: 360858 km

Sep 01  06:06  Spica 2.2°N of Moon
    03  02     Mercury at Greatest Elong: 18.1°W
    04  09:00  Antares 3.7°S of Moon
    04  13:39  FIRST QUARTER MOON 
    05  03:36  Moon at Ascending Node 
    08  03     Mercury at Perihelion 
    08  04:45  Mars 5.8°S of Pollux
    08  22:18  Mercury 0.6°N of Regulus
    12  05:27  FULL MOON 
    15  02:23  Moon at Apogee: 406068 km
    16  14:20  Jupiter 4.7°S of Moon
    18  02:46  Pleiades 2.5°N of Moon
    19  15:38  Moon at Descending Node 
    20  09:39  LAST QUARTER MOON 
    23  04:23  Mars 4.8°N of Moon
    23  05:05  Autumnal Equinox 
    25  03:49  Regulus 5.7°N of Moon
    25  20     Uranus at Opposition 
    27  07:09  NEW MOON 
    27  21:01  Moon at Perigee: 357556 km
    28  16     Mercury at Superior Conjunction 
    30  20:53  Mars 0.4°S of Beehive

Oct 01  16:04  Antares 3.9°S of Moon
    02  05:09  Moon at Ascending Node 
    03  23:15  FIRST QUARTER MOON 
    11  22:06  FULL MOON 
    12  07:43  Moon at Apogee: 406435 km
    13  15:28  Jupiter 4.8°S of Moon
    13  17     Saturn in Conjunction with Sun 
    15  08:49  Pleiades 2.7°N of Moon
    16  17:01  Moon at Descending Node 
    19  23:30  LAST QUARTER MOON 
    21  18     Orionid Meteor Shower
    22  13:52  Regulus 5.8°N of Moon
    26  08:26  Moon at Perigee: 357051 km
    26  15:56  NEW MOON 
    27  22:14  Mercury 0.2°N of Moon: Occn.
    28  01:11  Venus 1.8°N of Moon
    28  21     Jupiter at Opposition 
    29  01:37  Antares 4.1°S of Moon
    29  10:59  Moon at Ascending Node 

Nov 01  16     Mercury 2.0° of Venus
    02  12:38  FIRST QUARTER MOON 
    05  18     S Taurid Meteor Shower
    08  09:20  Moon at Apogee: 406177 km
    09  14:40  Jupiter 5.0°S of Moon
    10  03:51  Venus 3.8°N of Antares
    10  04:27  Mercury 1.9°N of Antares
    10  14:21  Mars 1.3°N of Regulus
    10  16:16  FULL MOON 
    11  07:32  Saturn 4.0°N of Spica
    11  14:43  Pleiades 2.8°N of Moon
    12  13:18  Aldebaran 5.9°S of Moon
    12  18     N Taurid Meteor Shower
    12  20:35  Moon at Descending Node 
    13  04     Mercury 2.0° of Venus
    14  05     Mercury at Greatest Elong: 22.7°E
    18  00     Leonid Meteor Shower
    18  11:09  LAST QUARTER MOON 
    18  21:42  Regulus 6.0°N of Moon
    22  13:21  Spica 2.1°N of Moon
    23  19:24  Moon at Perigee: 359692 km
    25  02:10  NEW MOON 
    25  02:20  Partial Solar Eclipse; mag=0.905
    25  21:02  Moon at Ascending Node 
    26  05:48  Mercury 1.7°S of Moon
    27  00:29  Venus 2.8°S of Moon

Dec 02  05:52  FIRST QUARTER MOON 
    04  05     Mercury at Inferior Conjunction 
    05  02     Mercury at Perihelion 
    05  21:13  Moon at Apogee: 405414 km
    06  16:10  Jupiter 5.2°S of Moon
    08  21:26  Pleiades 2.8°N of Moon
    09  19:51  Aldebaran 5.9°S of Moon
    10  03:04  Moon at Descending Node 
    10  10:32  Total Lunar Eclipse; mag=1.106
    10  10:36  FULL MOON 
    14  13     Geminid Meteor Shower
    16  03:26  Regulus 6.0°N of Moon
    17  20:48  LAST QUARTER MOON 
    19  21:37  Spica 2.1°N of Moon
    21  22:56  Moon at Perigee: 364801 km
    22  01:30  Winter Solstice 
    22  22     Ursid Meteor Shower
    22  23     Mercury at Greatest Elong: 21.8°W
    22  23:05  Antares 4.1°S of Moon
    22  23:50  Mercury 2.6°N of Moon
    23  07:36  Moon at Ascending Node 
    24  06:36  Mercury 6.3°N of Antares
    24  14:06  NEW MOON 

    

Astronomical Definitions

  • Perihelion - the instant when a planet is closest to the Sun
  • Aphelion - the instant when a planet is furthest from the Sun
  • Perigee - the instant when the Moon is closest to Earth
  • Apogee - the instant when the Moon is furthest from Earth
  • Inferior Conjunction - the instant when a planet passes between Earth and the Sun (Mercury or Venus)
  • Superior Conjunction - the instant when a planet passes on the opposite side of the Sun from Earth (Mercury or Venus)
  • Greatest Elongation - elongation is the apparent angle between a planet and the Sun 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 - the instant when a planet appears opposite the Sun as seen from Earth
  • Conjunction - the instant when a planet appears closest the Sun as seen from Earth
  • Occultation - the Moon occults or eclipses a star or planet
  • Ascending Node - the point where a planet crosses from the southern to northern portion of its orbit
  • Descending Node - the point where a planet crosses from the northern to the southern portion of its orbit



Calendars for Other Years and Time Zones

The table below contains links to astronomical events calendars for a range of years and Time Zones. Abbreviations for the time zones are: GMT = Greenwich Mean Time, AST = Atlantic Standard Time, EST = Eastern Standard Time, CST = Central Standard Time, MST = Mountain Standard Time, PST = Pacific Standard Time, AKST = Alaskan Standard Time, and HST = Hawaiian Standard Time.

Calendar of Astronomical Events
GMT 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
AST 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
EST 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
CST 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
MST 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
PST 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
AKST 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025
HST 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025

For years or time zones not covered above, please visit SKYCAL the astronomical events calendar generator.

Accuracy

The times of astronomical events listed with a precision in hours and minutes (i.e., hh:mm) are accurate to the nearest minute. Similarly, the times of astronomical events listed with a precision in hours (i.e., hh) are accurate to the nearest hour.

A simplified solar ephemeris results an accuracy of ±0.5 hours for the perihelion and aphelion of Earth. The algorithm used in the perihelion and aphelion of the other planets is based on unperturbed elliptical orbits. For Mars, the accuracy is about 2 hours. Due to mutual planetary perturbations, the times for Jupiter may be in error by several weeks, while Saturn's times may be in error by a month. The times for Uranus and Neptune may be in error by several months. In the future, we plan to develop algorithms to improve the computed times of perihelion and aphelion of the planets.

Acknowledgements

All calculations are by Fred Espenak, and he assumes full responsibility for their accuracy. Algorithms used in predicting the phases of the Moon, eclipses and other sky phenomena 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:


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