2011 Calendar of Astronomical Events




    


2011 Phases of the Moon

Alaska 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
Alaska Standard Time
New Moon First Quarter Full Moon Last Quarter
Jan 4 00:03 P Jan 12 02:31 Jan 19 12:21 Jan 26 03:57
Feb 2 17:31 Feb 10 22:18 Feb 17 23:36 Feb 24 14:26
Mar 4 11:46 Mar 12 14:45 Mar 19 09:10 Mar 26 03:07
Apr 3 05:32 Apr 11 03:05 Apr 17 17:44 Apr 24 17:47
May 2 21:51 May 10 11:33 May 17 02:09 May 24 09:52
Jun 1 12:03 P Jun 8 17:11 Jun 15 11:13 t Jun 23 02:48
Jun 30 23:54 P Jul 7 21:29 Jul 14 21:40 Jul 22 20:02
Jul 30 09:40 Aug 6 02:08 Aug 13 09:58 Aug 21 12:55
Aug 28 18:04 Sep 4 08:39 Sep 12 00:27 Sep 20 04:39
Sep 27 02:09 Oct 3 18:15 Oct 11 17:06 Oct 19 18:30
Oct 26 10:56 Nov 2 07:38 Nov 10 11:16 Nov 18 06:09
Nov 24 21:10 P Dec 2 00:52 Dec 10 05:36 t Dec 17 15:48
Dec 24 09:06 ---

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

Alaska 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     AKST   Even
        (h:m)

Jan 01  09:07  Antares 2.5°S of Moon
    02  05:32  Mercury 3.8°N of Moon
    03  03:48  Moon at Ascending Node 
    03  10     Earth at Perihelion: 0.98334 AU
    03  16     Quadrantid Meteor Shower
    03  23:51  Partial Solar Eclipse; mag=0.858
    04  00:03  NEW MOON 
    08  06     Venus at Greatest Elong: 47.0°W
    09  05     Mercury at Greatest Elong: 23.3°W
    09  20:38  Moon at Apogee: 404976 km
    12  02:31  FIRST QUARTER MOON 
    15  03:39  Pleiades 1.3°N of Moon
    17  15:06  Moon at Descending Node 
    19  12:21  FULL MOON 
    21  15:10  Moon at Perigee: 362793 km
    21  16:55  Regulus 5.3°N of Moon
    25  08:38  Spica 3.0°N of Moon
    26  03:57  LAST QUARTER MOON 
    28  14:53  Antares 2.6°S of Moon
    29  18:36  Venus 3.5°N of Moon
    30  09:29  Moon at Ascending Node 
    31  00     Mercury at Aphelion 

Feb 01  09:14  Mercury 3.6°S of Moon
    02  17:31  NEW MOON 
    04  08     Mars in Conjunction with Sun 
    06  14:13  Moon at Apogee: 405924 km
    10  22:18  FIRST QUARTER MOON 
    11  12:32  Pleiades 1.4°N of Moon
    13  23:14  Moon at Descending Node 
    17  00     Neptune in Conjunction with Sun 
    17  23:36  FULL MOON 
    18  03:18  Regulus 5.2°N of Moon
    18  22:27  Moon at Perigee: 358247 km
    21  16:02  Spica 2.8°N of Moon
    24  14:26  LAST QUARTER MOON 
    24  20:26  Antares 2.8°S of Moon
    24  23     Mercury at Superior Conjunction 
    26  11:19  Moon at Ascending Node 
    28  18:40  Venus 1.6°S of Moon

Mar 04  11:46  NEW MOON 
    05  22:50  Moon at Apogee: 406584 km
    09  03     Mars at Perihelion 
    10  19:35  Pleiades 1.7°N of Moon
    12  14:45  FIRST QUARTER MOON 
    13  02:55  Moon at Descending Node 
    15  11     Mercury 2.0° of Jupiter
    15  23     Mercury at Perihelion 
    16  02     Jupiter at Perihelion 
    17  14:35  Regulus 5.3°N of Moon
    19  09:10  FULL MOON 
    19  10:09  Moon at Perigee: 356578 km
    20  14:21  Vernal Equinox 
    21  02:00  Spica 2.6°N of Moon
    21  03     Uranus in Conjunction with Sun 
    22  16     Mercury at Greatest Elong: 18.6°E
    24  03:48  Antares 3.0°S of Moon
    25  12:09  Moon at Ascending Node 
    26  03:07  LAST QUARTER MOON 

Apr 02  00:00  Moon at Apogee: 406656 km
    03  05:32  NEW MOON 
    03  14     Saturn at Opposition 
    06  06     Jupiter in Conjunction with Sun 
    07  01:19  Pleiades 1.9°N of Moon
    09  03:48  Moon at Descending Node 
    09  10     Mercury at Inferior Conjunction 
    11  03:05  FIRST QUARTER MOON 
    14  00:34  Regulus 5.5°N of Moon
    16  20:59  Moon at Perigee: 358088 km
    17  13:04  Spica 2.5°N of Moon
    17  17:44  FULL MOON 
    18  15     Venus at Aphelion 
    19  09     Mercury 0.6° of Mars
    20  13:21  Antares 3.2°S of Moon
    21  16:05  Moon at Ascending Node 
    22  14     Lyrid Meteor Shower
    24  17:47  LAST QUARTER MOON 
    29  09:02  Moon at Apogee: 406043 km

May 02  21:51  NEW MOON 
    05  03     Eta-Aquarid Meteor Shower
    06  05:54  Moon at Descending Node 
    07  10     Mercury at Greatest Elong: 26.6°W
    07  20     Mercury 1.4° of Venus
    10  11:33  FIRST QUARTER MOON 
    11  08:05  Regulus 5.7°N of Moon
    11  11     Mercury 2.1° of Jupiter
    14  23:08  Spica 2.6°N of Moon
    15  02:18  Moon at Perigee: 362133 km
    17  02:09  FULL MOON 
    17  22     Mercury 1.4° of Venus
    17  23:46  Antares 3.3°S of Moon
    19  00:03  Moon at Ascending Node 
    20  23     Mercury 2.1° of Mars
    24  09:52  LAST QUARTER MOON 
    27  00:58  Moon at Apogee: 405006 km
    29  05:31  Jupiter 5.7°S of Moon
    30  11:04  Mars 3.8°S of Moon
    30  19:00  Venus 4.4°S of Moon

Jun 01  12:03  NEW MOON 
    01  12:16  Partial Solar Eclipse; mag=0.601
    02  11:21  Moon at Descending Node 
    07  13:45  Regulus 5.7°N of Moon
    08  17:11  FIRST QUARTER MOON 
    09  05:50  Venus 5.0°S of Pleiades
    11  06:57  Spica 2.6°N of Moon
    11  16:42  Moon at Perigee: 367188 km
    11  23     Mercury at Perihelion 
    12  14     Mercury at Superior Conjunction 
    14  09:17  Antares 3.3°S of Moon
    15  09:35  Moon at Ascending Node 
    15  11:13  Total Lunar Eclipse; mag=1.700
    15  11:13  FULL MOON 
    17  03:15  Venus 4.6°N of Aldebaran
    20  16:24  Mars 4.2°S of Pleiades
    21  08:16  Summer Solstice 
    23  02:48  LAST QUARTER MOON 
    23  19:13  Moon at Apogee: 404275 km
    25  23:45  Jupiter 5.4°S of Moon
    27  21:52  Pleiades 2.0°N of Moon
    27  22:40  Mercury 4.7°S of Pollux
    28  09:59  Mars 1.7°S of Moon
    29  19:14  Moon at Descending Node 
    30  23:38  Partial Solar Eclipse; mag=0.097
    30  23:54  NEW MOON 

Date     AKST   Even
        (h:m)

Jul 02  17:11  Mercury 5.1°N of Moon
    04  06     Earth at Aphelion: 1.01674 AU
    04  10:18  Mars 5.4°N of Aldebaran
    04  19:23  Regulus 5.7°N of Moon
    06  08:36  Mercury 0.2°S of Beehive
    07  05:04  Moon at Perigee: 369566 km
    07  21:29  FIRST QUARTER MOON 
    08  12:44  Spica 2.6°N of Moon
    11  16:48  Antares 3.3°S of Moon
    12  17:27  Moon at Ascending Node 
    14  21:40  FULL MOON 
    19  20     Mercury at Greatest Elong: 26.8°E
    21  13:46  Moon at Apogee: 404358 km
    22  20:02  LAST QUARTER MOON 
    23  15:34  Jupiter 5.1°S of Moon
    25  06:28  Pleiades 2.1°N of Moon
    25  22     Mercury at Aphelion 
    26  03:51  Mercury 2.1°S of Regulus
    27  03:03  Moon at Descending Node 
    27  07:52  Mars 0.5°N of Moon: Occn.
    28  05     Delta-Aquarid Meteor Shower
    30  09:40  NEW MOON 

Aug 01  02:20  Mercury 1.5°N of Moon
    01  02:41  Regulus 5.6°N of Moon
    02  11:59  Moon at Perigee: 365756 km
    04  18:08  Spica 2.4°N of Moon
    06  02:08  FIRST QUARTER MOON 
    07  22:32  Antares 3.5°S of Moon
    08  21:35  Moon at Ascending Node 
    08  23     Venus at Perihelion 
    12  21     Perseid Meteor Shower
    13  09:58  FULL MOON 
    16  03     Venus at Superior Conjunction 
    16  16     Mercury at Inferior Conjunction 
    18  07:23  Moon at Apogee: 405161 km
    20  03:13  Jupiter 4.8°S of Moon
    21  12:55  LAST QUARTER MOON 
    21  14:40  Pleiades 2.3°N of Moon
    22  13     Neptune at Opposition 
    23  08:23  Moon at Descending Node 
    25  04:36  Mars 2.7°N of Moon
    27  16:07  Mercury 2.6°N of Moon
    28  18:04  NEW MOON 
    30  08:35  Moon at Perigee: 360858 km

Sep 01  01:06  Spica 2.2°N of Moon
    02  21     Mercury at Greatest Elong: 18.1°W
    04  04:00  Antares 3.7°S of Moon
    04  08:39  FIRST QUARTER MOON 
    04  22:36  Moon at Ascending Node 
    07  22     Mercury at Perihelion 
    07  23:45  Mars 5.8°S of Pollux
    08  17:18  Mercury 0.6°N of Regulus
    12  00:27  FULL MOON 
    14  21:23  Moon at Apogee: 406068 km
    16  09:20  Jupiter 4.7°S of Moon
    17  21:46  Pleiades 2.5°N of Moon
    19  10:38  Moon at Descending Node 
    20  04:39  LAST QUARTER MOON 
    22  23:23  Mars 4.8°N of Moon
    23  00:05  Autumnal Equinox 
    24  22:49  Regulus 5.7°N of Moon
    25  15     Uranus at Opposition 
    27  02:09  NEW MOON 
    27  16:01  Moon at Perigee: 357556 km
    28  11     Mercury at Superior Conjunction 
    30  15:53  Mars 0.4°S of Beehive

Oct 01  11:04  Antares 3.9°S of Moon
    02  00:09  Moon at Ascending Node 
    03  18:15  FIRST QUARTER MOON 
    11  17:06  FULL MOON 
    12  02:43  Moon at Apogee: 406435 km
    13  10:28  Jupiter 4.8°S of Moon
    13  12     Saturn in Conjunction with Sun 
    15  03:49  Pleiades 2.7°N of Moon
    16  12:01  Moon at Descending Node 
    19  18:30  LAST QUARTER MOON 
    21  13     Orionid Meteor Shower
    22  08:52  Regulus 5.8°N of Moon
    26  03:26  Moon at Perigee: 357051 km
    26  10:56  NEW MOON 
    27  17:14  Mercury 0.2°N of Moon: Occn.
    27  20:11  Venus 1.8°N of Moon
    28  16     Jupiter at Opposition 
    28  20:37  Antares 4.1°S of Moon
    29  05:59  Moon at Ascending Node 

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

Dec 02  00:52  FIRST QUARTER MOON 
    04  00     Mercury at Inferior Conjunction 
    04  21     Mercury at Perihelion 
    05  16:13  Moon at Apogee: 405414 km
    06  11:10  Jupiter 5.2°S of Moon
    08  16:26  Pleiades 2.8°N of Moon
    09  14:51  Aldebaran 5.9°S of Moon
    09  22:04  Moon at Descending Node 
    10  05:32  Total Lunar Eclipse; mag=1.106
    10  05:36  FULL MOON 
    14  08     Geminid Meteor Shower
    15  22:26  Regulus 6.0°N of Moon
    17  15:48  LAST QUARTER MOON 
    19  16:37  Spica 2.1°N of Moon
    21  17:56  Moon at Perigee: 364801 km
    21  20:30  Winter Solstice 
    22  17     Ursid Meteor Shower
    22  18     Mercury at Greatest Elong: 21.8°W
    22  18:05  Antares 4.1°S of Moon
    22  18:50  Mercury 2.6°N of Moon
    23  02:36  Moon at Ascending Node 
    24  01:36  Mercury 6.3°N of Antares
    24  09:06  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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