2011 Calendar of Astronomical Events




    


2011 Phases of the Moon

Pacific 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
Pacific Standard Time
New Moon First Quarter Full Moon Last Quarter
Jan 4 01:03 P Jan 12 03:31 Jan 19 13:21 Jan 26 04:57
Feb 2 18:31 Feb 10 23:18 Feb 18 00:36 Feb 24 15:26
Mar 4 12:46 Mar 12 15:45 Mar 19 10:10 Mar 26 04:07
Apr 3 06:32 Apr 11 04:05 Apr 17 18:44 Apr 24 18:47
May 2 22:51 May 10 12:33 May 17 03:09 May 24 10:52
Jun 1 13:03 P Jun 8 18:11 Jun 15 12:13 t Jun 23 03:48
Jul 1 00:54 P Jul 7 22:29 Jul 14 22:40 Jul 22 21:02
Jul 30 10:40 Aug 6 03:08 Aug 13 10:58 Aug 21 13:55
Aug 28 19:04 Sep 4 09:39 Sep 12 01:27 Sep 20 05:39
Sep 27 03:09 Oct 3 19:15 Oct 11 18:06 Oct 19 19:30
Oct 26 11:56 Nov 2 08:38 Nov 10 12:16 Nov 18 07:09
Nov 24 22:10 P Dec 2 01:52 Dec 10 06:36 t Dec 17 16:48
Dec 24 10:06 ---

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

Pacific 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     PST   Event
        (h:m)

Jan 01  10:07  Antares 2.5°S of Moon
    02  06:32  Mercury 3.8°N of Moon
    03  04:48  Moon at Ascending Node 
    03  11     Earth at Perihelion: 0.98334 AU
    03  17     Quadrantid Meteor Shower
    04  00:51  Partial Solar Eclipse; mag=0.858
    04  01:03  NEW MOON 
    08  07     Venus at Greatest Elong: 47.0°W
    09  06     Mercury at Greatest Elong: 23.3°W
    09  21:38  Moon at Apogee: 404976 km
    12  03:31  FIRST QUARTER MOON 
    15  04:39  Pleiades 1.3°N of Moon
    17  16:06  Moon at Descending Node 
    19  13:21  FULL MOON 
    21  16:10  Moon at Perigee: 362793 km
    21  17:55  Regulus 5.3°N of Moon
    25  09:38  Spica 3.0°N of Moon
    26  04:57  LAST QUARTER MOON 
    28  15:53  Antares 2.6°S of Moon
    29  19:36  Venus 3.5°N of Moon
    30  10:29  Moon at Ascending Node 
    31  01     Mercury at Aphelion 

Feb 01  10:14  Mercury 3.6°S of Moon
    02  18:31  NEW MOON 
    04  09     Mars in Conjunction with Sun 
    06  15:13  Moon at Apogee: 405924 km
    10  23:18  FIRST QUARTER MOON 
    11  13:32  Pleiades 1.4°N of Moon
    14  00:14  Moon at Descending Node 
    17  01     Neptune in Conjunction with Sun 
    18  00:36  FULL MOON 
    18  04:18  Regulus 5.2°N of Moon
    18  23:27  Moon at Perigee: 358247 km
    21  17:02  Spica 2.8°N of Moon
    24  15:26  LAST QUARTER MOON 
    24  21:26  Antares 2.8°S of Moon
    25  00     Mercury at Superior Conjunction 
    26  12:19  Moon at Ascending Node 
    28  19:40  Venus 1.6°S of Moon

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

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

May 02  22:51  NEW MOON 
    05  04     Eta-Aquarid Meteor Shower
    06  06:54  Moon at Descending Node 
    07  11     Mercury at Greatest Elong: 26.6°W
    07  21     Mercury 1.4° of Venus
    10  12:33  FIRST QUARTER MOON 
    11  09:05  Regulus 5.7°N of Moon
    11  12     Mercury 2.1° of Jupiter
    15  00:08  Spica 2.6°N of Moon
    15  03:18  Moon at Perigee: 362133 km
    17  03:09  FULL MOON 
    17  23     Mercury 1.4° of Venus
    18  00:46  Antares 3.3°S of Moon
    19  01:03  Moon at Ascending Node 
    21  00     Mercury 2.1° of Mars
    24  10:52  LAST QUARTER MOON 
    27  01:58  Moon at Apogee: 405006 km
    29  06:31  Jupiter 5.7°S of Moon
    30  12:04  Mars 3.8°S of Moon
    30  20:00  Venus 4.4°S of Moon

Jun 01  13:03  NEW MOON 
    01  13:16  Partial Solar Eclipse; mag=0.601
    02  12:21  Moon at Descending Node 
    07  14:45  Regulus 5.7°N of Moon
    08  18:11  FIRST QUARTER MOON 
    09  06:50  Venus 5.0°S of Pleiades
    11  07:57  Spica 2.6°N of Moon
    11  17:42  Moon at Perigee: 367188 km
    12  00     Mercury at Perihelion 
    12  15     Mercury at Superior Conjunction 
    14  10:17  Antares 3.3°S of Moon
    15  10:35  Moon at Ascending Node 
    15  12:13  Total Lunar Eclipse; mag=1.700
    15  12:13  FULL MOON 
    17  04:15  Venus 4.6°N of Aldebaran
    20  17:24  Mars 4.2°S of Pleiades
    21  09:16  Summer Solstice 
    23  03:48  LAST QUARTER MOON 
    23  20:13  Moon at Apogee: 404275 km
    26  00:45  Jupiter 5.4°S of Moon
    27  22:52  Pleiades 2.0°N of Moon
    27  23:40  Mercury 4.7°S of Pollux
    28  10:59  Mars 1.7°S of Moon
    29  20:14  Moon at Descending Node 

Date     PST   Event
        (h:m)

Jul 01  00:38  Partial Solar Eclipse; mag=0.097
    01  00:54  NEW MOON 
    02  18:11  Mercury 5.1°N of Moon
    04  07     Earth at Aphelion: 1.01674 AU
    04  11:18  Mars 5.4°N of Aldebaran
    04  20:23  Regulus 5.7°N of Moon
    06  09:36  Mercury 0.2°S of Beehive
    07  06:04  Moon at Perigee: 369566 km
    07  22:29  FIRST QUARTER MOON 
    08  13:44  Spica 2.6°N of Moon
    11  17:48  Antares 3.3°S of Moon
    12  18:27  Moon at Ascending Node 
    14  22:40  FULL MOON 
    19  21     Mercury at Greatest Elong: 26.8°E
    21  14:46  Moon at Apogee: 404358 km
    22  21:02  LAST QUARTER MOON 
    23  16:34  Jupiter 5.1°S of Moon
    25  07:28  Pleiades 2.1°N of Moon
    25  23     Mercury at Aphelion 
    26  04:51  Mercury 2.1°S of Regulus
    27  04:03  Moon at Descending Node 
    27  08:52  Mars 0.5°N of Moon: Occn.
    28  06     Delta-Aquarid Meteor Shower
    30  10:40  NEW MOON 

Aug 01  03:20  Mercury 1.5°N of Moon
    01  03:41  Regulus 5.6°N of Moon
    02  12:59  Moon at Perigee: 365756 km
    04  19:08  Spica 2.4°N of Moon
    06  03:08  FIRST QUARTER MOON 
    07  23:32  Antares 3.5°S of Moon
    08  22:35  Moon at Ascending Node 
    09  00     Venus at Perihelion 
    12  22     Perseid Meteor Shower
    13  10:58  FULL MOON 
    16  04     Venus at Superior Conjunction 
    16  17     Mercury at Inferior Conjunction 
    18  08:23  Moon at Apogee: 405161 km
    20  04:13  Jupiter 4.8°S of Moon
    21  13:55  LAST QUARTER MOON 
    21  15:40  Pleiades 2.3°N of Moon
    22  14     Neptune at Opposition 
    23  09:23  Moon at Descending Node 
    25  05:36  Mars 2.7°N of Moon
    27  17:07  Mercury 2.6°N of Moon
    28  19:04  NEW MOON 
    30  09:35  Moon at Perigee: 360858 km

Sep 01  02:06  Spica 2.2°N of Moon
    02  22     Mercury at Greatest Elong: 18.1°W
    04  05:00  Antares 3.7°S of Moon
    04  09:39  FIRST QUARTER MOON 
    04  23:36  Moon at Ascending Node 
    07  23     Mercury at Perihelion 
    08  00:45  Mars 5.8°S of Pollux
    08  18:18  Mercury 0.6°N of Regulus
    12  01:27  FULL MOON 
    14  22:23  Moon at Apogee: 406068 km
    16  10:20  Jupiter 4.7°S of Moon
    17  22:46  Pleiades 2.5°N of Moon
    19  11:38  Moon at Descending Node 
    20  05:39  LAST QUARTER MOON 
    23  00:23  Mars 4.8°N of Moon
    23  01:05  Autumnal Equinox 
    24  23:49  Regulus 5.7°N of Moon
    25  16     Uranus at Opposition 
    27  03:09  NEW MOON 
    27  17:01  Moon at Perigee: 357556 km
    28  12     Mercury at Superior Conjunction 
    30  16:53  Mars 0.4°S of Beehive

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

Nov 01  12     Mercury 2.0° of Venus
    02  08:38  FIRST QUARTER MOON 
    05  14     S Taurid Meteor Shower
    08  05:20  Moon at Apogee: 406177 km
    09  10:40  Jupiter 5.0°S of Moon
    09  23:51  Venus 3.8°N of Antares
    10  00:27  Mercury 1.9°N of Antares
    10  10:21  Mars 1.3°N of Regulus
    10  12:16  FULL MOON 
    11  03:32  Saturn 4.0°N of Spica
    11  10:43  Pleiades 2.8°N of Moon
    12  09:18  Aldebaran 5.9°S of Moon
    12  14     N Taurid Meteor Shower
    12  16:35  Moon at Descending Node 
    13  00     Mercury 2.0° of Venus
    14  01     Mercury at Greatest Elong: 22.7°E
    17  20     Leonid Meteor Shower
    18  07:09  LAST QUARTER MOON 
    18  17:42  Regulus 6.0°N of Moon
    22  09:21  Spica 2.1°N of Moon
    23  15:24  Moon at Perigee: 359692 km
    24  22:10  NEW MOON 
    24  22:20  Partial Solar Eclipse; mag=0.905
    25  17:02  Moon at Ascending Node 
    26  01:48  Mercury 1.7°S of Moon
    26  20:29  Venus 2.8°S of Moon

Dec 02  01:52  FIRST QUARTER MOON 
    04  01     Mercury at Inferior Conjunction 
    04  22     Mercury at Perihelion 
    05  17:13  Moon at Apogee: 405414 km
    06  12:10  Jupiter 5.2°S of Moon
    08  17:26  Pleiades 2.8°N of Moon
    09  15:51  Aldebaran 5.9°S of Moon
    09  23:04  Moon at Descending Node 
    10  06:32  Total Lunar Eclipse; mag=1.106
    10  06:36  FULL MOON 
    14  09     Geminid Meteor Shower
    15  23:26  Regulus 6.0°N of Moon
    17  16:48  LAST QUARTER MOON 
    19  17:37  Spica 2.1°N of Moon
    21  18:56  Moon at Perigee: 364801 km
    21  21:30  Winter Solstice 
    22  18     Ursid Meteor Shower
    22  19     Mercury at Greatest Elong: 21.8°W
    22  19:05  Antares 4.1°S of Moon
    22  19:50  Mercury 2.6°N of Moon
    23  03:36  Moon at Ascending Node 
    24  02:36  Mercury 6.3°N of Antares
    24  10:06  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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