2011 Calendar of Astronomical Events




    


2011 Phases of the Moon

Central 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
Central Standard Time
New Moon First Quarter Full Moon Last Quarter
Jan 4 03:03 P Jan 12 05:31 Jan 19 15:21 Jan 26 06:57
Feb 2 20:31 Feb 11 01:18 Feb 18 02:36 Feb 24 17:26
Mar 4 14:46 Mar 12 17:45 Mar 19 12:10 Mar 26 06:07
Apr 3 08:32 Apr 11 06:05 Apr 17 20:44 Apr 24 20:47
May 3 00:51 May 10 14:33 May 17 05:09 May 24 12:52
Jun 1 15:03 P Jun 8 20:11 Jun 15 14:13 t Jun 23 05:48
Jul 1 02:54 P Jul 8 00:29 Jul 15 00:40 Jul 22 23:02
Jul 30 12:40 Aug 6 05:08 Aug 13 12:58 Aug 21 15:55
Aug 28 21:04 Sep 4 11:39 Sep 12 03:27 Sep 20 07:39
Sep 27 05:09 Oct 3 21:15 Oct 11 20:06 Oct 19 21:30
Oct 26 13:56 Nov 2 10:38 Nov 10 14:16 Nov 18 09:09
Nov 25 00:10 P Dec 2 03:52 Dec 10 08:36 t Dec 17 18:48
Dec 24 12:06 ---

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

Central 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     CST   Event
        (h:m)

Jan 01  12:07  Antares 2.5°S of Moon
    02  08:32  Mercury 3.8°N of Moon
    03  06:48  Moon at Ascending Node 
    03  13     Earth at Perihelion: 0.98334 AU
    03  19     Quadrantid Meteor Shower
    04  02:51  Partial Solar Eclipse; mag=0.858
    04  03:03  NEW MOON 
    08  09     Venus at Greatest Elong: 47.0°W
    09  08     Mercury at Greatest Elong: 23.3°W
    09  23:38  Moon at Apogee: 404976 km
    12  05:31  FIRST QUARTER MOON 
    15  06:39  Pleiades 1.3°N of Moon
    17  18:06  Moon at Descending Node 
    19  15:21  FULL MOON 
    21  18:10  Moon at Perigee: 362793 km
    21  19:55  Regulus 5.3°N of Moon
    25  11:38  Spica 3.0°N of Moon
    26  06:57  LAST QUARTER MOON 
    28  17:53  Antares 2.6°S of Moon
    29  21:36  Venus 3.5°N of Moon
    30  12:29  Moon at Ascending Node 
    31  03     Mercury at Aphelion 

Feb 01  12:14  Mercury 3.6°S of Moon
    02  20:31  NEW MOON 
    04  11     Mars in Conjunction with Sun 
    06  17:13  Moon at Apogee: 405924 km
    11  01:18  FIRST QUARTER MOON 
    11  15:32  Pleiades 1.4°N of Moon
    14  02:14  Moon at Descending Node 
    17  03     Neptune in Conjunction with Sun 
    18  02:36  FULL MOON 
    18  06:18  Regulus 5.2°N of Moon
    19  01:27  Moon at Perigee: 358247 km
    21  19:02  Spica 2.8°N of Moon
    24  17:26  LAST QUARTER MOON 
    24  23:26  Antares 2.8°S of Moon
    25  02     Mercury at Superior Conjunction 
    26  14:19  Moon at Ascending Node 
    28  21:40  Venus 1.6°S of Moon

Mar 04  14:46  NEW MOON 
    06  01:50  Moon at Apogee: 406584 km
    09  06     Mars at Perihelion 
    10  22:35  Pleiades 1.7°N of Moon
    12  17:45  FIRST QUARTER MOON 
    13  05:55  Moon at Descending Node 
    15  14     Mercury 2.0° of Jupiter
    16  02     Mercury at Perihelion 
    16  05     Jupiter at Perihelion 
    17  17:35  Regulus 5.3°N of Moon
    19  12:10  FULL MOON 
    19  13:09  Moon at Perigee: 356578 km
    20  17:21  Vernal Equinox 
    21  05:00  Spica 2.6°N of Moon
    21  06     Uranus in Conjunction with Sun 
    22  19     Mercury at Greatest Elong: 18.6°E
    24  06:48  Antares 3.0°S of Moon
    25  15:09  Moon at Ascending Node 
    26  06:07  LAST QUARTER MOON 

Apr 02  03:00  Moon at Apogee: 406656 km
    03  08:32  NEW MOON 
    03  17     Saturn at Opposition 
    06  09     Jupiter in Conjunction with Sun 
    07  04:19  Pleiades 1.9°N of Moon
    09  06:48  Moon at Descending Node 
    09  13     Mercury at Inferior Conjunction 
    11  06:05  FIRST QUARTER MOON 
    14  03:34  Regulus 5.5°N of Moon
    16  23:59  Moon at Perigee: 358088 km
    17  16:04  Spica 2.5°N of Moon
    17  20:44  FULL MOON 
    18  18     Venus at Aphelion 
    19  12     Mercury 0.6° of Mars
    20  16:21  Antares 3.2°S of Moon
    21  19:05  Moon at Ascending Node 
    22  17     Lyrid Meteor Shower
    24  20:47  LAST QUARTER MOON 
    29  12:02  Moon at Apogee: 406043 km

May 03  00:51  NEW MOON 
    05  06     Eta-Aquarid Meteor Shower
    06  08:54  Moon at Descending Node 
    07  13     Mercury at Greatest Elong: 26.6°W
    07  23     Mercury 1.4° of Venus
    10  14:33  FIRST QUARTER MOON 
    11  11:05  Regulus 5.7°N of Moon
    11  14     Mercury 2.1° of Jupiter
    15  02:08  Spica 2.6°N of Moon
    15  05:18  Moon at Perigee: 362133 km
    17  05:09  FULL MOON 
    18  01     Mercury 1.4° of Venus
    18  02:46  Antares 3.3°S of Moon
    19  03:03  Moon at Ascending Node 
    21  02     Mercury 2.1° of Mars
    24  12:52  LAST QUARTER MOON 
    27  03:58  Moon at Apogee: 405006 km
    29  08:31  Jupiter 5.7°S of Moon
    30  14:04  Mars 3.8°S of Moon
    30  22:00  Venus 4.4°S of Moon

Jun 01  15:03  NEW MOON 
    01  15:16  Partial Solar Eclipse; mag=0.601
    02  14:21  Moon at Descending Node 
    07  16:45  Regulus 5.7°N of Moon
    08  20:11  FIRST QUARTER MOON 
    09  08:50  Venus 5.0°S of Pleiades
    11  09:57  Spica 2.6°N of Moon
    11  19:42  Moon at Perigee: 367188 km
    12  02     Mercury at Perihelion 
    12  17     Mercury at Superior Conjunction 
    14  12:17  Antares 3.3°S of Moon
    15  12:35  Moon at Ascending Node 
    15  14:13  Total Lunar Eclipse; mag=1.700
    15  14:13  FULL MOON 
    17  06:15  Venus 4.6°N of Aldebaran
    20  19:24  Mars 4.2°S of Pleiades
    21  11:16  Summer Solstice 
    23  05:48  LAST QUARTER MOON 
    23  22:13  Moon at Apogee: 404275 km
    26  02:45  Jupiter 5.4°S of Moon
    28  00:52  Pleiades 2.0°N of Moon
    28  01:40  Mercury 4.7°S of Pollux
    28  12:59  Mars 1.7°S of Moon
    29  22:14  Moon at Descending Node 

Date     CST   Event
        (h:m)

Jul 01  02:38  Partial Solar Eclipse; mag=0.097
    01  02:54  NEW MOON 
    02  20:11  Mercury 5.1°N of Moon
    04  09     Earth at Aphelion: 1.01674 AU
    04  13:18  Mars 5.4°N of Aldebaran
    04  22:23  Regulus 5.7°N of Moon
    06  11:36  Mercury 0.2°S of Beehive
    07  08:04  Moon at Perigee: 369566 km
    08  00:29  FIRST QUARTER MOON 
    08  15:44  Spica 2.6°N of Moon
    11  19:48  Antares 3.3°S of Moon
    12  20:27  Moon at Ascending Node 
    15  00:40  FULL MOON 
    19  23     Mercury at Greatest Elong: 26.8°E
    21  16:46  Moon at Apogee: 404358 km
    22  23:02  LAST QUARTER MOON 
    23  18:34  Jupiter 5.1°S of Moon
    25  09:28  Pleiades 2.1°N of Moon
    26  01     Mercury at Aphelion 
    26  06:51  Mercury 2.1°S of Regulus
    27  06:03  Moon at Descending Node 
    27  10:52  Mars 0.5°N of Moon: Occn.
    28  08     Delta-Aquarid Meteor Shower
    30  12:40  NEW MOON 

Aug 01  05:20  Mercury 1.5°N of Moon
    01  05:41  Regulus 5.6°N of Moon
    02  14:59  Moon at Perigee: 365756 km
    04  21:08  Spica 2.4°N of Moon
    06  05:08  FIRST QUARTER MOON 
    08  01:32  Antares 3.5°S of Moon
    09  00:35  Moon at Ascending Node 
    09  02     Venus at Perihelion 
    13  00     Perseid Meteor Shower
    13  12:58  FULL MOON 
    16  06     Venus at Superior Conjunction 
    16  19     Mercury at Inferior Conjunction 
    18  10:23  Moon at Apogee: 405161 km
    20  06:13  Jupiter 4.8°S of Moon
    21  15:55  LAST QUARTER MOON 
    21  17:40  Pleiades 2.3°N of Moon
    22  16     Neptune at Opposition 
    23  11:23  Moon at Descending Node 
    25  07:36  Mars 2.7°N of Moon
    27  19:07  Mercury 2.6°N of Moon
    28  21:04  NEW MOON 
    30  11:35  Moon at Perigee: 360858 km

Sep 01  04:06  Spica 2.2°N of Moon
    03  00     Mercury at Greatest Elong: 18.1°W
    04  07:00  Antares 3.7°S of Moon
    04  11:39  FIRST QUARTER MOON 
    05  01:36  Moon at Ascending Node 
    08  01     Mercury at Perihelion 
    08  02:45  Mars 5.8°S of Pollux
    08  20:18  Mercury 0.6°N of Regulus
    12  03:27  FULL MOON 
    15  00:23  Moon at Apogee: 406068 km
    16  12:20  Jupiter 4.7°S of Moon
    18  00:46  Pleiades 2.5°N of Moon
    19  13:38  Moon at Descending Node 
    20  07:39  LAST QUARTER MOON 
    23  02:23  Mars 4.8°N of Moon
    23  03:05  Autumnal Equinox 
    25  01:49  Regulus 5.7°N of Moon
    25  18     Uranus at Opposition 
    27  05:09  NEW MOON 
    27  19:01  Moon at Perigee: 357556 km
    28  14     Mercury at Superior Conjunction 
    30  18:53  Mars 0.4°S of Beehive

Oct 01  14:04  Antares 3.9°S of Moon
    02  03:09  Moon at Ascending Node 
    03  21:15  FIRST QUARTER MOON 
    11  20:06  FULL MOON 
    12  05:43  Moon at Apogee: 406435 km
    13  13:28  Jupiter 4.8°S of Moon
    13  15     Saturn in Conjunction with Sun 
    15  06:49  Pleiades 2.7°N of Moon
    16  15:01  Moon at Descending Node 
    19  21:30  LAST QUARTER MOON 
    21  16     Orionid Meteor Shower
    22  11:52  Regulus 5.8°N of Moon
    26  06:26  Moon at Perigee: 357051 km
    26  13:56  NEW MOON 
    27  20:14  Mercury 0.2°N of Moon: Occn.
    27  23:11  Venus 1.8°N of Moon
    28  19     Jupiter at Opposition 
    28  23:37  Antares 4.1°S of Moon
    29  08:59  Moon at Ascending Node 

Nov 01  14     Mercury 2.0° of Venus
    02  10:38  FIRST QUARTER MOON 
    05  16     S Taurid Meteor Shower
    08  07:20  Moon at Apogee: 406177 km
    09  12:40  Jupiter 5.0°S of Moon
    10  01:51  Venus 3.8°N of Antares
    10  02:27  Mercury 1.9°N of Antares
    10  12:21  Mars 1.3°N of Regulus
    10  14:16  FULL MOON 
    11  05:32  Saturn 4.0°N of Spica
    11  12:43  Pleiades 2.8°N of Moon
    12  11:18  Aldebaran 5.9°S of Moon
    12  16     N Taurid Meteor Shower
    12  18:35  Moon at Descending Node 
    13  02     Mercury 2.0° of Venus
    14  03     Mercury at Greatest Elong: 22.7°E
    17  22     Leonid Meteor Shower
    18  09:09  LAST QUARTER MOON 
    18  19:42  Regulus 6.0°N of Moon
    22  11:21  Spica 2.1°N of Moon
    23  17:24  Moon at Perigee: 359692 km
    25  00:10  NEW MOON 
    25  00:20  Partial Solar Eclipse; mag=0.905
    25  19:02  Moon at Ascending Node 
    26  03:48  Mercury 1.7°S of Moon
    26  22:29  Venus 2.8°S of Moon

Dec 02  03:52  FIRST QUARTER MOON 
    04  03     Mercury at Inferior Conjunction 
    05  00     Mercury at Perihelion 
    05  19:13  Moon at Apogee: 405414 km
    06  14:10  Jupiter 5.2°S of Moon
    08  19:26  Pleiades 2.8°N of Moon
    09  17:51  Aldebaran 5.9°S of Moon
    10  01:04  Moon at Descending Node 
    10  08:32  Total Lunar Eclipse; mag=1.106
    10  08:36  FULL MOON 
    14  11     Geminid Meteor Shower
    16  01:26  Regulus 6.0°N of Moon
    17  18:48  LAST QUARTER MOON 
    19  19:37  Spica 2.1°N of Moon
    21  20:56  Moon at Perigee: 364801 km
    21  23:30  Winter Solstice 
    22  20     Ursid Meteor Shower
    22  21     Mercury at Greatest Elong: 21.8°W
    22  21:05  Antares 4.1°S of Moon
    22  21:50  Mercury 2.6°N of Moon
    23  05:36  Moon at Ascending Node 
    24  04:36  Mercury 6.3°N of Antares
    24  12:06  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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