2011 Calendar of Astronomical Events




    


2011 Phases of the Moon

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

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

Eastern 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     EST   Event
        (h:m)

Jan 01  13:07  Antares 2.5°S of Moon
    02  09:32  Mercury 3.8°N of Moon
    03  07:48  Moon at Ascending Node 
    03  14     Earth at Perihelion: 0.98334 AU
    03  20     Quadrantid Meteor Shower
    04  03:51  Partial Solar Eclipse; mag=0.858
    04  04:03  NEW MOON 
    08  10     Venus at Greatest Elong: 47.0°W
    09  09     Mercury at Greatest Elong: 23.3°W
    10  00:38  Moon at Apogee: 404976 km
    12  06:31  FIRST QUARTER MOON 
    15  07:39  Pleiades 1.3°N of Moon
    17  19:06  Moon at Descending Node 
    19  16:21  FULL MOON 
    21  19:10  Moon at Perigee: 362793 km
    21  20:55  Regulus 5.3°N of Moon
    25  12:38  Spica 3.0°N of Moon
    26  07:57  LAST QUARTER MOON 
    28  18:53  Antares 2.6°S of Moon
    29  22:36  Venus 3.5°N of Moon
    30  13:29  Moon at Ascending Node 
    31  04     Mercury at Aphelion 

Feb 01  13:14  Mercury 3.6°S of Moon
    02  21:31  NEW MOON 
    04  12     Mars in Conjunction with Sun 
    06  18:13  Moon at Apogee: 405924 km
    11  02:18  FIRST QUARTER MOON 
    11  16:32  Pleiades 1.4°N of Moon
    14  03:14  Moon at Descending Node 
    17  04     Neptune in Conjunction with Sun 
    18  03:36  FULL MOON 
    18  07:18  Regulus 5.2°N of Moon
    19  02:27  Moon at Perigee: 358247 km
    21  20:02  Spica 2.8°N of Moon
    24  18:26  LAST QUARTER MOON 
    25  00:26  Antares 2.8°S of Moon
    25  03     Mercury at Superior Conjunction 
    26  15:19  Moon at Ascending Node 
    28  22:40  Venus 1.6°S of Moon

Mar 04  15:46  NEW MOON 
    06  02:50  Moon at Apogee: 406584 km
    09  07     Mars at Perihelion 
    10  23:35  Pleiades 1.7°N of Moon
    12  18:45  FIRST QUARTER MOON 
    13  06:55  Moon at Descending Node 
    15  15     Mercury 2.0° of Jupiter
    16  03     Mercury at Perihelion 
    16  06     Jupiter at Perihelion 
    17  18:35  Regulus 5.3°N of Moon
    19  13:10  FULL MOON 
    19  14:09  Moon at Perigee: 356578 km
    20  18:21  Vernal Equinox 
    21  06:00  Spica 2.6°N of Moon
    21  07     Uranus in Conjunction with Sun 
    22  20     Mercury at Greatest Elong: 18.6°E
    24  07:48  Antares 3.0°S of Moon
    25  16:09  Moon at Ascending Node 
    26  07:07  LAST QUARTER MOON 

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

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

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

Date     EST   Event
        (h:m)

Jul 01  03:38  Partial Solar Eclipse; mag=0.097
    01  03:54  NEW MOON 
    02  21:11  Mercury 5.1°N of Moon
    04  10     Earth at Aphelion: 1.01674 AU
    04  14:18  Mars 5.4°N of Aldebaran
    04  23:23  Regulus 5.7°N of Moon
    06  12:36  Mercury 0.2°S of Beehive
    07  09:04  Moon at Perigee: 369566 km
    08  01:29  FIRST QUARTER MOON 
    08  16:44  Spica 2.6°N of Moon
    11  20:48  Antares 3.3°S of Moon
    12  21:27  Moon at Ascending Node 
    15  01:40  FULL MOON 
    20  00     Mercury at Greatest Elong: 26.8°E
    21  17:46  Moon at Apogee: 404358 km
    23  00:02  LAST QUARTER MOON 
    23  19:34  Jupiter 5.1°S of Moon
    25  10:28  Pleiades 2.1°N of Moon
    26  02     Mercury at Aphelion 
    26  07:51  Mercury 2.1°S of Regulus
    27  07:03  Moon at Descending Node 
    27  11:52  Mars 0.5°N of Moon: Occn.
    28  09     Delta-Aquarid Meteor Shower
    30  13:40  NEW MOON 

Aug 01  06:20  Mercury 1.5°N of Moon
    01  06:41  Regulus 5.6°N of Moon
    02  15:59  Moon at Perigee: 365756 km
    04  22:08  Spica 2.4°N of Moon
    06  06:08  FIRST QUARTER MOON 
    08  02:32  Antares 3.5°S of Moon
    09  01:35  Moon at Ascending Node 
    09  03     Venus at Perihelion 
    13  01     Perseid Meteor Shower
    13  13:58  FULL MOON 
    16  07     Venus at Superior Conjunction 
    16  20     Mercury at Inferior Conjunction 
    18  11:23  Moon at Apogee: 405161 km
    20  07:13  Jupiter 4.8°S of Moon
    21  16:55  LAST QUARTER MOON 
    21  18:40  Pleiades 2.3°N of Moon
    22  17     Neptune at Opposition 
    23  12:23  Moon at Descending Node 
    25  08:36  Mars 2.7°N of Moon
    27  20:07  Mercury 2.6°N of Moon
    28  22:04  NEW MOON 
    30  12:35  Moon at Perigee: 360858 km

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

Oct 01  15:04  Antares 3.9°S of Moon
    02  04:09  Moon at Ascending Node 
    03  22:15  FIRST QUARTER MOON 
    11  21:06  FULL MOON 
    12  06:43  Moon at Apogee: 406435 km
    13  14:28  Jupiter 4.8°S of Moon
    13  16     Saturn in Conjunction with Sun 
    15  07:49  Pleiades 2.7°N of Moon
    16  16:01  Moon at Descending Node 
    19  22:30  LAST QUARTER MOON 
    21  17     Orionid Meteor Shower
    22  12:52  Regulus 5.8°N of Moon
    26  07:26  Moon at Perigee: 357051 km
    26  14:56  NEW MOON 
    27  21:14  Mercury 0.2°N of Moon: Occn.
    28  00:11  Venus 1.8°N of Moon
    28  20     Jupiter at Opposition 
    29  00:37  Antares 4.1°S of Moon
    29  09:59  Moon at Ascending Node 

Nov 01  15     Mercury 2.0° of Venus
    02  11:38  FIRST QUARTER MOON 
    05  17     S Taurid Meteor Shower
    08  08:20  Moon at Apogee: 406177 km
    09  13:40  Jupiter 5.0°S of Moon
    10  02:51  Venus 3.8°N of Antares
    10  03:27  Mercury 1.9°N of Antares
    10  13:21  Mars 1.3°N of Regulus
    10  15:16  FULL MOON 
    11  06:32  Saturn 4.0°N of Spica
    11  13:43  Pleiades 2.8°N of Moon
    12  12:18  Aldebaran 5.9°S of Moon
    12  17     N Taurid Meteor Shower
    12  19:35  Moon at Descending Node 
    13  03     Mercury 2.0° of Venus
    14  04     Mercury at Greatest Elong: 22.7°E
    17  23     Leonid Meteor Shower
    18  10:09  LAST QUARTER MOON 
    18  20:42  Regulus 6.0°N of Moon
    22  12:21  Spica 2.1°N of Moon
    23  18:24  Moon at Perigee: 359692 km
    25  01:10  NEW MOON 
    25  01:20  Partial Solar Eclipse; mag=0.905
    25  20:02  Moon at Ascending Node 
    26  04:48  Mercury 1.7°S of Moon
    26  23:29  Venus 2.8°S of Moon

Dec 02  04:52  FIRST QUARTER MOON 
    04  04     Mercury at Inferior Conjunction 
    05  01     Mercury at Perihelion 
    05  20:13  Moon at Apogee: 405414 km
    06  15:10  Jupiter 5.2°S of Moon
    08  20:26  Pleiades 2.8°N of Moon
    09  18:51  Aldebaran 5.9°S of Moon
    10  02:04  Moon at Descending Node 
    10  09:32  Total Lunar Eclipse; mag=1.106
    10  09:36  FULL MOON 
    14  12     Geminid Meteor Shower
    16  02:26  Regulus 6.0°N of Moon
    17  19:48  LAST QUARTER MOON 
    19  20:37  Spica 2.1°N of Moon
    21  21:56  Moon at Perigee: 364801 km
    22  00:30  Winter Solstice 
    22  21     Ursid Meteor Shower
    22  22     Mercury at Greatest Elong: 21.8°W
    22  22:05  Antares 4.1°S of Moon
    22  22:50  Mercury 2.6°N of Moon
    23  06:36  Moon at Ascending Node 
    24  05:36  Mercury 6.3°N of Antares
    24  13:06  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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