2011 Calendar of Astronomical Events




    


2011 Phases of the Moon

Greenwich Mean 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
Greenwich Mean Time
New Moon First Quarter Full Moon Last Quarter
Jan 4 09:03 P Jan 12 11:31 Jan 19 21:21 Jan 26 12:57
Feb 3 02:31 Feb 11 07:18 Feb 18 08:36 Feb 24 23:26
Mar 4 20:46 Mar 12 23:45 Mar 19 18:10 Mar 26 12:07
Apr 3 14:32 Apr 11 12:05 Apr 18 02:44 Apr 25 02:47
May 3 06:51 May 10 20:33 May 17 11:09 May 24 18:52
Jun 1 21:03 P Jun 9 02:11 Jun 15 20:13 t Jun 23 11:48
Jul 1 08:54 P Jul 8 06:29 Jul 15 06:40 Jul 23 05:02
Jul 30 18:40 Aug 6 11:08 Aug 13 18:58 Aug 21 21:55
Aug 29 03:04 Sep 4 17:39 Sep 12 09:27 Sep 20 13:39
Sep 27 11:09 Oct 4 03:15 Oct 12 02:06 Oct 20 03:30
Oct 26 19:56 Nov 2 16:38 Nov 10 20:16 Nov 18 15:09
Nov 25 06:10 P Dec 2 09:52 Dec 10 14:36 t Dec 18 00:48
Dec 24 18:06 ---

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

Greenwich Mean 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     GMT   Event
        (h:m)

Jan 01  18:07  Antares 2.5°S of Moon
    02  14:32  Mercury 3.8°N of Moon
    03  12:48  Moon at Ascending Node 
    03  19     Earth at Perihelion: 0.98334 AU
    04  01     Quadrantid Meteor Shower
    04  08:51  Partial Solar Eclipse; mag=0.858
    04  09:03  NEW MOON 
    08  15     Venus at Greatest Elong: 47.0°W
    09  14     Mercury at Greatest Elong: 23.3°W
    10  05:38  Moon at Apogee: 404976 km
    12  11:31  FIRST QUARTER MOON 
    15  12:39  Pleiades 1.3°N of Moon
    18  00:06  Moon at Descending Node 
    19  21:21  FULL MOON 
    22  00:10  Moon at Perigee: 362793 km
    22  01:55  Regulus 5.3°N of Moon
    25  17:38  Spica 3.0°N of Moon
    26  12:57  LAST QUARTER MOON 
    28  23:53  Antares 2.6°S of Moon
    30  03:36  Venus 3.5°N of Moon
    30  18:29  Moon at Ascending Node 
    31  09     Mercury at Aphelion 

Feb 01  18:14  Mercury 3.6°S of Moon
    03  02:31  NEW MOON 
    04  17     Mars in Conjunction with Sun 
    06  23:13  Moon at Apogee: 405924 km
    11  07:18  FIRST QUARTER MOON 
    11  21:32  Pleiades 1.4°N of Moon
    14  08:14  Moon at Descending Node 
    17  09     Neptune in Conjunction with Sun 
    18  08:36  FULL MOON 
    18  12:18  Regulus 5.2°N of Moon
    19  07:27  Moon at Perigee: 358247 km
    22  01:02  Spica 2.8°N of Moon
    24  23:26  LAST QUARTER MOON 
    25  05:26  Antares 2.8°S of Moon
    25  08     Mercury at Superior Conjunction 
    26  20:19  Moon at Ascending Node 

Mar 01  03:40  Venus 1.6°S of Moon
    04  20:46  NEW MOON 
    06  07:50  Moon at Apogee: 406584 km
    09  12     Mars at Perihelion 
    11  04:35  Pleiades 1.7°N of Moon
    12  23:45  FIRST QUARTER MOON 
    13  11:55  Moon at Descending Node 
    15  20     Mercury 2.0° of Jupiter
    16  08     Mercury at Perihelion 
    16  11     Jupiter at Perihelion 
    17  23:35  Regulus 5.3°N of Moon
    19  18:10  FULL MOON 
    19  19:09  Moon at Perigee: 356578 km
    20  23:21  Vernal Equinox 
    21  11:00  Spica 2.6°N of Moon
    21  12     Uranus in Conjunction with Sun 
    23  01     Mercury at Greatest Elong: 18.6°E
    24  12:48  Antares 3.0°S of Moon
    25  21:09  Moon at Ascending Node 
    26  12:07  LAST QUARTER MOON 

Apr 02  09:00  Moon at Apogee: 406656 km
    03  14:32  NEW MOON 
    03  23     Saturn at Opposition 
    06  15     Jupiter in Conjunction with Sun 
    07  10:19  Pleiades 1.9°N of Moon
    09  12:48  Moon at Descending Node 
    09  19     Mercury at Inferior Conjunction 
    11  12:05  FIRST QUARTER MOON 
    14  09:34  Regulus 5.5°N of Moon
    17  05:59  Moon at Perigee: 358088 km
    17  22:04  Spica 2.5°N of Moon
    18  02:44  FULL MOON 
    19  00     Venus at Aphelion 
    19  18     Mercury 0.6° of Mars
    20  22:21  Antares 3.2°S of Moon
    22  01:05  Moon at Ascending Node 
    22  23     Lyrid Meteor Shower
    25  02:47  LAST QUARTER MOON 
    29  18:02  Moon at Apogee: 406043 km

May 03  06:51  NEW MOON 
    05  12     Eta-Aquarid Meteor Shower
    06  14:54  Moon at Descending Node 
    07  19     Mercury at Greatest Elong: 26.6°W
    08  05     Mercury 1.4° of Venus
    10  20:33  FIRST QUARTER MOON 
    11  17:05  Regulus 5.7°N of Moon
    11  20     Mercury 2.1° of Jupiter
    15  08:08  Spica 2.6°N of Moon
    15  11:18  Moon at Perigee: 362133 km
    17  11:09  FULL MOON 
    18  07     Mercury 1.4° of Venus
    18  08:46  Antares 3.3°S of Moon
    19  09:03  Moon at Ascending Node 
    21  08     Mercury 2.1° of Mars
    24  18:52  LAST QUARTER MOON 
    27  09:58  Moon at Apogee: 405006 km
    29  14:31  Jupiter 5.7°S of Moon
    30  20:04  Mars 3.8°S of Moon
    31  04:00  Venus 4.4°S of Moon

Jun 01  21:03  NEW MOON 
    01  21:16  Partial Solar Eclipse; mag=0.601
    02  20:21  Moon at Descending Node 
    07  22:45  Regulus 5.7°N of Moon
    09  02:11  FIRST QUARTER MOON 
    09  14:50  Venus 5.0°S of Pleiades
    11  15:57  Spica 2.6°N of Moon
    12  01:42  Moon at Perigee: 367188 km
    12  08     Mercury at Perihelion 
    12  23     Mercury at Superior Conjunction 
    14  18:17  Antares 3.3°S of Moon
    15  18:35  Moon at Ascending Node 
    15  20:13  Total Lunar Eclipse; mag=1.700
    15  20:13  FULL MOON 
    17  12:15  Venus 4.6°N of Aldebaran
    21  01:24  Mars 4.2°S of Pleiades
    21  17:16  Summer Solstice 
    23  11:48  LAST QUARTER MOON 
    24  04:13  Moon at Apogee: 404275 km
    26  08:45  Jupiter 5.4°S of Moon
    28  06:52  Pleiades 2.0°N of Moon
    28  07:40  Mercury 4.7°S of Pollux
    28  18:59  Mars 1.7°S of Moon
    30  04:14  Moon at Descending Node 

Date     GMT   Event
        (h:m)

Jul 01  08:38  Partial Solar Eclipse; mag=0.097
    01  08:54  NEW MOON 
    03  02:11  Mercury 5.1°N of Moon
    04  15     Earth at Aphelion: 1.01674 AU
    04  19:18  Mars 5.4°N of Aldebaran
    05  04:23  Regulus 5.7°N of Moon
    06  17:36  Mercury 0.2°S of Beehive
    07  14:04  Moon at Perigee: 369566 km
    08  06:29  FIRST QUARTER MOON 
    08  21:44  Spica 2.6°N of Moon
    12  01:48  Antares 3.3°S of Moon
    13  02:27  Moon at Ascending Node 
    15  06:40  FULL MOON 
    20  05     Mercury at Greatest Elong: 26.8°E
    21  22:46  Moon at Apogee: 404358 km
    23  05:02  LAST QUARTER MOON 
    24  00:34  Jupiter 5.1°S of Moon
    25  15:28  Pleiades 2.1°N of Moon
    26  07     Mercury at Aphelion 
    26  12:51  Mercury 2.1°S of Regulus
    27  12:03  Moon at Descending Node 
    27  16:52  Mars 0.5°N of Moon: Occn.
    28  14     Delta-Aquarid Meteor Shower
    30  18:40  NEW MOON 

Aug 01  11:20  Mercury 1.5°N of Moon
    01  11:41  Regulus 5.6°N of Moon
    02  20:59  Moon at Perigee: 365756 km
    05  03:08  Spica 2.4°N of Moon
    06  11:08  FIRST QUARTER MOON 
    08  07:32  Antares 3.5°S of Moon
    09  06:35  Moon at Ascending Node 
    09  08     Venus at Perihelion 
    13  06     Perseid Meteor Shower
    13  18:58  FULL MOON 
    16  12     Venus at Superior Conjunction 
    17  01     Mercury at Inferior Conjunction 
    18  16:23  Moon at Apogee: 405161 km
    20  12:13  Jupiter 4.8°S of Moon
    21  21:55  LAST QUARTER MOON 
    21  23:40  Pleiades 2.3°N of Moon
    22  22     Neptune at Opposition 
    23  17:23  Moon at Descending Node 
    25  13:36  Mars 2.7°N of Moon
    28  01:07  Mercury 2.6°N of Moon
    29  03:04  NEW MOON 
    30  17:35  Moon at Perigee: 360858 km

Sep 01  10:06  Spica 2.2°N of Moon
    03  06     Mercury at Greatest Elong: 18.1°W
    04  13:00  Antares 3.7°S of Moon
    04  17:39  FIRST QUARTER MOON 
    05  07:36  Moon at Ascending Node 
    08  07     Mercury at Perihelion 
    08  08:45  Mars 5.8°S of Pollux
    09  02:18  Mercury 0.6°N of Regulus
    12  09:27  FULL MOON 
    15  06:23  Moon at Apogee: 406068 km
    16  18:20  Jupiter 4.7°S of Moon
    18  06:46  Pleiades 2.5°N of Moon
    19  19:38  Moon at Descending Node 
    20  13:39  LAST QUARTER MOON 
    23  08:23  Mars 4.8°N of Moon
    23  09:05  Autumnal Equinox 
    25  07:49  Regulus 5.7°N of Moon
    26  00     Uranus at Opposition 
    27  11:09  NEW MOON 
    28  01:01  Moon at Perigee: 357556 km
    28  20     Mercury at Superior Conjunction 

Oct 01  00:53  Mars 0.4°S of Beehive
    01  20:04  Antares 3.9°S of Moon
    02  09:09  Moon at Ascending Node 
    04  03:15  FIRST QUARTER MOON 
    12  02:06  FULL MOON 
    12  11:43  Moon at Apogee: 406435 km
    13  19:28  Jupiter 4.8°S of Moon
    13  21     Saturn in Conjunction with Sun 
    15  12:49  Pleiades 2.7°N of Moon
    16  21:01  Moon at Descending Node 
    20  03:30  LAST QUARTER MOON 
    21  22     Orionid Meteor Shower
    22  17:52  Regulus 5.8°N of Moon
    26  12:26  Moon at Perigee: 357051 km
    26  19:56  NEW MOON 
    28  02:14  Mercury 0.2°N of Moon: Occn.
    28  05:11  Venus 1.8°N of Moon
    29  01     Jupiter at Opposition 
    29  05:37  Antares 4.1°S of Moon
    29  14:59  Moon at Ascending Node 

Nov 01  20     Mercury 2.0° of Venus
    02  16:38  FIRST QUARTER MOON 
    05  22     S Taurid Meteor Shower
    08  13:20  Moon at Apogee: 406177 km
    09  18:40  Jupiter 5.0°S of Moon
    10  07:51  Venus 3.8°N of Antares
    10  08:27  Mercury 1.9°N of Antares
    10  18:21  Mars 1.3°N of Regulus
    10  20:16  FULL MOON 
    11  11:32  Saturn 4.0°N of Spica
    11  18:43  Pleiades 2.8°N of Moon
    12  17:18  Aldebaran 5.9°S of Moon
    12  22     N Taurid Meteor Shower
    13  00:35  Moon at Descending Node 
    13  08     Mercury 2.0° of Venus
    14  09     Mercury at Greatest Elong: 22.7°E
    18  04     Leonid Meteor Shower
    18  15:09  LAST QUARTER MOON 
    19  01:42  Regulus 6.0°N of Moon
    22  17:21  Spica 2.1°N of Moon
    23  23:24  Moon at Perigee: 359692 km
    25  06:10  NEW MOON 
    25  06:20  Partial Solar Eclipse; mag=0.905
    26  01:02  Moon at Ascending Node 
    26  09:48  Mercury 1.7°S of Moon
    27  04:29  Venus 2.8°S of Moon

Dec 02  09:52  FIRST QUARTER MOON 
    04  09     Mercury at Inferior Conjunction 
    05  06     Mercury at Perihelion 
    06  01:13  Moon at Apogee: 405414 km
    06  20:10  Jupiter 5.2°S of Moon
    09  01:26  Pleiades 2.8°N of Moon
    09  23:51  Aldebaran 5.9°S of Moon
    10  07:04  Moon at Descending Node 
    10  14:32  Total Lunar Eclipse; mag=1.106
    10  14:36  FULL MOON 
    14  17     Geminid Meteor Shower
    16  07:26  Regulus 6.0°N of Moon
    18  00:48  LAST QUARTER MOON 
    20  01:37  Spica 2.1°N of Moon
    22  02:56  Moon at Perigee: 364801 km
    22  05:30  Winter Solstice 
    23  02     Ursid Meteor Shower
    23  03     Mercury at Greatest Elong: 21.8°W
    23  03:05  Antares 4.1°S of Moon
    23  03:50  Mercury 2.6°N of Moon
    23  11:36  Moon at Ascending Node 
    24  10:36  Mercury 6.3°N of Antares
    24  18:06  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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