2011 Calendar of Astronomical Events




    


2011 Phases of the Moon

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

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

Hawaiian 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     HST   Event
        (h:m)

Jan 01  08:07  Antares 2.5°S of Moon
    02  04:32  Mercury 3.8°N of Moon
    03  02:48  Moon at Ascending Node 
    03  09     Earth at Perihelion: 0.98334 AU
    03  15     Quadrantid Meteor Shower
    03  22:51  Partial Solar Eclipse; mag=0.858
    03  23:03  NEW MOON 
    08  05     Venus at Greatest Elong: 47.0°W
    09  04     Mercury at Greatest Elong: 23.3°W
    09  19:38  Moon at Apogee: 404976 km
    12  01:31  FIRST QUARTER MOON 
    15  02:39  Pleiades 1.3°N of Moon
    17  14:06  Moon at Descending Node 
    19  11:21  FULL MOON 
    21  14:10  Moon at Perigee: 362793 km
    21  15:55  Regulus 5.3°N of Moon
    25  07:38  Spica 3.0°N of Moon
    26  02:57  LAST QUARTER MOON 
    28  13:53  Antares 2.6°S of Moon
    29  17:36  Venus 3.5°N of Moon
    30  08:29  Moon at Ascending Node 
    30  23     Mercury at Aphelion 

Feb 01  08:14  Mercury 3.6°S of Moon
    02  16:31  NEW MOON 
    04  07     Mars in Conjunction with Sun 
    06  13:13  Moon at Apogee: 405924 km
    10  21:18  FIRST QUARTER MOON 
    11  11:32  Pleiades 1.4°N of Moon
    13  22:14  Moon at Descending Node 
    16  23     Neptune in Conjunction with Sun 
    17  22:36  FULL MOON 
    18  02:18  Regulus 5.2°N of Moon
    18  21:27  Moon at Perigee: 358247 km
    21  15:02  Spica 2.8°N of Moon
    24  13:26  LAST QUARTER MOON 
    24  19:26  Antares 2.8°S of Moon
    24  22     Mercury at Superior Conjunction 
    26  10:19  Moon at Ascending Node 
    28  17:40  Venus 1.6°S of Moon

Mar 04  10:46  NEW MOON 
    05  21:50  Moon at Apogee: 406584 km
    09  02     Mars at Perihelion 
    10  18:35  Pleiades 1.7°N of Moon
    12  13:45  FIRST QUARTER MOON 
    13  01:55  Moon at Descending Node 
    15  10     Mercury 2.0° of Jupiter
    15  22     Mercury at Perihelion 
    16  01     Jupiter at Perihelion 
    17  13:35  Regulus 5.3°N of Moon
    19  08:10  FULL MOON 
    19  09:09  Moon at Perigee: 356578 km
    20  13:21  Vernal Equinox 
    21  01:00  Spica 2.6°N of Moon
    21  02     Uranus in Conjunction with Sun 
    22  15     Mercury at Greatest Elong: 18.6°E
    24  02:48  Antares 3.0°S of Moon
    25  11:09  Moon at Ascending Node 
    26  02:07  LAST QUARTER MOON 

Apr 01  23:00  Moon at Apogee: 406656 km
    03  04:32  NEW MOON 
    03  13     Saturn at Opposition 
    06  05     Jupiter in Conjunction with Sun 
    07  00:19  Pleiades 1.9°N of Moon
    09  02:48  Moon at Descending Node 
    09  09     Mercury at Inferior Conjunction 
    11  02:05  FIRST QUARTER MOON 
    13  23:34  Regulus 5.5°N of Moon
    16  19:59  Moon at Perigee: 358088 km
    17  12:04  Spica 2.5°N of Moon
    17  16:44  FULL MOON 
    18  14     Venus at Aphelion 
    19  08     Mercury 0.6° of Mars
    20  12:21  Antares 3.2°S of Moon
    21  15:05  Moon at Ascending Node 
    22  13     Lyrid Meteor Shower
    24  16:47  LAST QUARTER MOON 
    29  08:02  Moon at Apogee: 406043 km

May 02  20:51  NEW MOON 
    05  02     Eta-Aquarid Meteor Shower
    06  04:54  Moon at Descending Node 
    07  09     Mercury at Greatest Elong: 26.6°W
    07  19     Mercury 1.4° of Venus
    10  10:33  FIRST QUARTER MOON 
    11  07:05  Regulus 5.7°N of Moon
    11  10     Mercury 2.1° of Jupiter
    14  22:08  Spica 2.6°N of Moon
    15  01:18  Moon at Perigee: 362133 km
    17  01:09  FULL MOON 
    17  21     Mercury 1.4° of Venus
    17  22:46  Antares 3.3°S of Moon
    18  23:03  Moon at Ascending Node 
    20  22     Mercury 2.1° of Mars
    24  08:52  LAST QUARTER MOON 
    26  23:58  Moon at Apogee: 405006 km
    29  04:31  Jupiter 5.7°S of Moon
    30  10:04  Mars 3.8°S of Moon
    30  18:00  Venus 4.4°S of Moon

Jun 01  11:03  NEW MOON 
    01  11:16  Partial Solar Eclipse; mag=0.601
    02  10:21  Moon at Descending Node 
    07  12:45  Regulus 5.7°N of Moon
    08  16:11  FIRST QUARTER MOON 
    09  04:50  Venus 5.0°S of Pleiades
    11  05:57  Spica 2.6°N of Moon
    11  15:42  Moon at Perigee: 367188 km
    11  22     Mercury at Perihelion 
    12  13     Mercury at Superior Conjunction 
    14  08:17  Antares 3.3°S of Moon
    15  08:35  Moon at Ascending Node 
    15  10:13  Total Lunar Eclipse; mag=1.700
    15  10:13  FULL MOON 
    17  02:15  Venus 4.6°N of Aldebaran
    20  15:24  Mars 4.2°S of Pleiades
    21  07:16  Summer Solstice 
    23  01:48  LAST QUARTER MOON 
    23  18:13  Moon at Apogee: 404275 km
    25  22:45  Jupiter 5.4°S of Moon
    27  20:52  Pleiades 2.0°N of Moon
    27  21:40  Mercury 4.7°S of Pollux
    28  08:59  Mars 1.7°S of Moon
    29  18:14  Moon at Descending Node 
    30  22:38  Partial Solar Eclipse; mag=0.097
    30  22:54  NEW MOON 

Date     HST   Event
        (h:m)

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

Aug 01  01:20  Mercury 1.5°N of Moon
    01  01:41  Regulus 5.6°N of Moon
    02  10:59  Moon at Perigee: 365756 km
    04  17:08  Spica 2.4°N of Moon
    06  01:08  FIRST QUARTER MOON 
    07  21:32  Antares 3.5°S of Moon
    08  20:35  Moon at Ascending Node 
    08  22     Venus at Perihelion 
    12  20     Perseid Meteor Shower
    13  08:58  FULL MOON 
    16  02     Venus at Superior Conjunction 
    16  15     Mercury at Inferior Conjunction 
    18  06:23  Moon at Apogee: 405161 km
    20  02:13  Jupiter 4.8°S of Moon
    21  11:55  LAST QUARTER MOON 
    21  13:40  Pleiades 2.3°N of Moon
    22  12     Neptune at Opposition 
    23  07:23  Moon at Descending Node 
    25  03:36  Mars 2.7°N of Moon
    27  15:07  Mercury 2.6°N of Moon
    28  17:04  NEW MOON 
    30  07:35  Moon at Perigee: 360858 km

Sep 01  00:06  Spica 2.2°N of Moon
    02  20     Mercury at Greatest Elong: 18.1°W
    04  03:00  Antares 3.7°S of Moon
    04  07:39  FIRST QUARTER MOON 
    04  21:36  Moon at Ascending Node 
    07  21     Mercury at Perihelion 
    07  22:45  Mars 5.8°S of Pollux
    08  16:18  Mercury 0.6°N of Regulus
    11  23:27  FULL MOON 
    14  20:23  Moon at Apogee: 406068 km
    16  08:20  Jupiter 4.7°S of Moon
    17  20:46  Pleiades 2.5°N of Moon
    19  09:38  Moon at Descending Node 
    20  03:39  LAST QUARTER MOON 
    22  22:23  Mars 4.8°N of Moon
    22  23:05  Autumnal Equinox 
    24  21:49  Regulus 5.7°N of Moon
    25  14     Uranus at Opposition 
    27  01:09  NEW MOON 
    27  15:01  Moon at Perigee: 357556 km
    28  10     Mercury at Superior Conjunction 
    30  14:53  Mars 0.4°S of Beehive

Oct 01  10:04  Antares 3.9°S of Moon
    01  23:09  Moon at Ascending Node 
    03  17:15  FIRST QUARTER MOON 
    11  16:06  FULL MOON 
    12  01:43  Moon at Apogee: 406435 km
    13  09:28  Jupiter 4.8°S of Moon
    13  11     Saturn in Conjunction with Sun 
    15  02:49  Pleiades 2.7°N of Moon
    16  11:01  Moon at Descending Node 
    19  17:30  LAST QUARTER MOON 
    21  12     Orionid Meteor Shower
    22  07:52  Regulus 5.8°N of Moon
    26  02:26  Moon at Perigee: 357051 km
    26  09:56  NEW MOON 
    27  16:14  Mercury 0.2°N of Moon: Occn.
    27  19:11  Venus 1.8°N of Moon
    28  15     Jupiter at Opposition 
    28  19:37  Antares 4.1°S of Moon
    29  04:59  Moon at Ascending Node 

Nov 01  10     Mercury 2.0° of Venus
    02  06:38  FIRST QUARTER MOON 
    05  12     S Taurid Meteor Shower
    08  03:20  Moon at Apogee: 406177 km
    09  08:40  Jupiter 5.0°S of Moon
    09  21:51  Venus 3.8°N of Antares
    09  22:27  Mercury 1.9°N of Antares
    10  08:21  Mars 1.3°N of Regulus
    10  10:16  FULL MOON 
    11  01:32  Saturn 4.0°N of Spica
    11  08:43  Pleiades 2.8°N of Moon
    12  07:18  Aldebaran 5.9°S of Moon
    12  12     N Taurid Meteor Shower
    12  14:35  Moon at Descending Node 
    12  22     Mercury 2.0° of Venus
    13  23     Mercury at Greatest Elong: 22.7°E
    17  18     Leonid Meteor Shower
    18  05:09  LAST QUARTER MOON 
    18  15:42  Regulus 6.0°N of Moon
    22  07:21  Spica 2.1°N of Moon
    23  13:24  Moon at Perigee: 359692 km
    24  20:10  NEW MOON 
    24  20:20  Partial Solar Eclipse; mag=0.905
    25  15:02  Moon at Ascending Node 
    25  23:48  Mercury 1.7°S of Moon
    26  18:29  Venus 2.8°S of Moon

Dec 01  23:52  FIRST QUARTER MOON 
    03  23     Mercury at Inferior Conjunction 
    04  20     Mercury at Perihelion 
    05  15:13  Moon at Apogee: 405414 km
    06  10:10  Jupiter 5.2°S of Moon
    08  15:26  Pleiades 2.8°N of Moon
    09  13:51  Aldebaran 5.9°S of Moon
    09  21:04  Moon at Descending Node 
    10  04:32  Total Lunar Eclipse; mag=1.106
    10  04:36  FULL MOON 
    14  07     Geminid Meteor Shower
    15  21:26  Regulus 6.0°N of Moon
    17  14:48  LAST QUARTER MOON 
    19  15:37  Spica 2.1°N of Moon
    21  16:56  Moon at Perigee: 364801 km
    21  19:30  Winter Solstice 
    22  16     Ursid Meteor Shower
    22  17     Mercury at Greatest Elong: 21.8°W
    22  17:05  Antares 4.1°S of Moon
    22  17:50  Mercury 2.6°N of Moon
    23  01:36  Moon at Ascending Node 
    24  00:36  Mercury 6.3°N of Antares
    24  08:06  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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