2017 Calendar of Astronomical Events




    


2017 Phases of the Moon

Mountain 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.

2017 Phases of the Moon
Mountain Standard Time
New Moon First Quarter Full Moon Last Quarter
- Jan 5 12:47 Jan 12 04:34 Jan 19 15:14
Jan 27 17:07 Feb 3 21:19 Feb 10 17:33 n Feb 18 12:33
Feb 26 07:58 A Mar 5 04:32 Mar 12 07:54 Mar 20 08:58
Mar 27 19:57 Apr 3 11:39 Apr 10 23:08 Apr 19 02:57
Apr 26 05:16 May 2 19:47 May 10 14:43 May 18 17:33
May 25 12:44 Jun 1 05:42 Jun 9 06:10 Jun 17 04:33
Jun 23 19:31 Jun 30 17:51 Jul 8 21:07 Jul 16 12:26
Jul 23 02:46 Jul 30 08:23 Aug 7 11:11 p Aug 14 18:15
Aug 21 11:30 T Aug 29 01:13 Sep 6 00:03 Sep 12 23:25
Sep 19 22:30 Sep 27 19:54 Oct 5 11:40 Oct 12 05:25
Oct 19 12:12 Oct 27 15:22 Nov 3 22:23 Nov 10 13:37
Nov 18 04:42 Nov 26 10:03 Dec 3 08:47 Dec 10 00:51
Dec 17 23:31 Dec 26 02:20 --

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.



2017 Calendar of Astronomical Events

Mountain 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.

2017 Calendar of Astronomical Events
January - June July - December
Date     MST   Event
        (h:m)

Jan 02  02:20  Venus 1.9°S of Moon
    02  11:14  Moon at Descending Node 
    02  23:47  Mars 0.2°S of Moon: Occn.
    03  07     Quadrantid Meteor Shower
    04  08     Earth at Perihelion: 0.98331 AU
    05  12:47  FIRST QUARTER MOON 
    09  02     Mercury 6.7° of Saturn
    09  07:07  Aldebaran 0.4°S of Moon
    09  23:07  Moon at Perigee: 363242 km
    12  04:34  FULL MOON 
    12  06     Venus at Greatest Elong: 47.1°E
    13  06:59  Beehive 3.9°N of Moon
    14  21:07  Regulus 0.9°N of Moon
    15  03:44  Moon at Ascending Node 
    18  22:26  Jupiter 2.7°S of Moon
    19  03     Mercury at Greatest Elong: 24.1°W
    19  15:14  LAST QUARTER MOON 
    21  17:14  Moon at Apogee: 404913 km
    24  03:37  Saturn 3.6°S of Moon
    25  17:46  Mercury 3.7°S of Moon
    27  17:07  NEW MOON 
    29  15:21  Moon at Descending Node 
    31  06:11  Jupiter 3.5°N of Spica
    31  07:34  Venus 4.1°N of Moon
    31  18:09  Mars 2.3°N of Moon

Feb 03  21:19  FIRST QUARTER MOON 
    05  14:14  Aldebaran 0.2°S of Moon
    06  06:59  Moon at Perigee: 368817 km
    07  07     Mercury at Aphelion 
    09  16:46  Beehive 3.9°N of Moon
    10  17:33  FULL MOON 
    10  17:44  Pen. Lunar Eclipse; mag=0.988
    11  07:04  Regulus 0.8°N of Moon
    11  12:49  Moon at Ascending Node 
    15  07:55  Jupiter 2.7°S of Moon
    18  12:33  LAST QUARTER MOON 
    18  14     Jupiter at Aphelion 
    18  14:14  Moon at Apogee: 404376 km
    20  09     Venus at Perihelion 
    20  16:44  Saturn 3.6°S of Moon
    25  23:28  Moon at Descending Node 
    26  07:53  Annular Solar Eclipse; mag=0.992
    26  07:58  NEW MOON 

Mar 01  11:58  Mars 4.3°N of Moon
    01  19     Neptune in Conjunction with Sun 
    03  00:24  Moon at Perigee: 369065 km
    04  19:38  Aldebaran 0.2°S of Moon
    05  04:32  FIRST QUARTER MOON 
    06  17     Mercury at Superior Conjunction 
    09  00:12  Beehive 3.9°N of Moon
    10  15:20  Regulus 0.8°N of Moon
    10  21:17  Moon at Ascending Node 
    12  07:54  FULL MOON 
    14  13:04  Jupiter 2.5°S of Moon
    18  10:25  Moon at Apogee: 404651 km
    20  03:29  Vernal Equinox 
    20  03:49  Saturn 3.4°S of Moon
    20  08:58  LAST QUARTER MOON 
    23  07     Mercury at Perihelion 
    25  04     Venus at Inferior Conjunction 
    25  08:41  Moon at Descending Node 
    27  19:57  NEW MOON 
    30  05:39  Moon at Perigee: 363855 km
    30  06:03  Mars 5.5°N of Moon

Apr 01  01:50  Aldebaran 0.3°S of Moon
    01  03     Mercury at Greatest Elong: 19.0°E
    03  11:39  FIRST QUARTER MOON 
    05  05:45  Beehive 3.8°N of Moon
    06  21:30  Regulus 0.7°N of Moon
    07  02:14  Moon at Ascending Node 
    07  14     Jupiter at Opposition 
    10  14:20  Jupiter 2.2°S of Moon
    10  23:08  FULL MOON 
    13  23     Uranus in Conjunction with Sun 
    15  03:05  Moon at Apogee: 405478 km
    16  11:39  Saturn 3.2°S of Moon
    19  02:57  LAST QUARTER MOON 
    19  23     Mercury at Inferior Conjunction 
    21  01:16  Mars 3.4°S of Pleiades
    21  15:30  Moon at Descending Node 
    22  05     Lyrid Meteor Shower
    23  10:59  Venus 5.2°N of Moon
    26  05:16  NEW MOON 
    27  09:18  Moon at Perigee: 359325 km
    28  10:19  Aldebaran 0.5°S of Moon

May 02  11:23  Beehive 3.6°N of Moon
    02  19:47  FIRST QUARTER MOON 
    04  02:49  Regulus 0.5°N of Moon
    04  03:42  Moon at Ascending Node 
    04  18     Eta-Aquarid Meteor Shower
    05  06:51  Mars 6.1°N of Aldebaran
    07  14:24  Jupiter 2.1°S of Moon
    10  14:43  FULL MOON 
    12  12:51  Moon at Apogee: 406212 km
    13  16:07  Saturn 3.1°S of Moon
    17  16     Mercury at Greatest Elong: 25.8°W
    18  17:33  LAST QUARTER MOON 
    18  18:30  Moon at Descending Node 
    22  05:32  Venus 2.4°N of Moon
    23  18:20  Mercury 1.6°N of Moon
    25  12:44  NEW MOON 
    25  18:23  Moon at Perigee: 357210 km
    29  18:50  Beehive 3.4°N of Moon
    31  04:56  Moon at Ascending Node 
    31  09:08  Regulus 0.3°N of Moon

Jun 01  05:42  FIRST QUARTER MOON 
    03  04     Venus at Greatest Elong: 45.9°W
    03  16:57  Jupiter 2.3°S of Moon
    06  20:19  Mercury 5.3°S of Pleiades
    08  15:21  Moon at Apogee: 406402 km
    09  06:10  FULL MOON 
    09  18:25  Saturn 3.1°S of Moon
    12  17     Venus at Aphelion 
    14  19:40  Moon at Descending Node 
    15  02     Saturn at Opposition 
    17  04:33  LAST QUARTER MOON 
    19  06     Mercury at Perihelion 
    20  14:13  Venus 2.4°N of Moon
    20  21:25  Summer Solstice 
    21  07     Mercury at Superior Conjunction 
    22  07:23  Aldebaran 0.5°S of Moon
    23  03:49  Moon at Perigee: 357938 km
    23  19:31  NEW MOON 
    26  04:18  Beehive 3.2°N of Moon
    27  09:26  Moon at Ascending Node 
    27  17:26  Regulus 0.1°N of Moon
    30  17:51  FIRST QUARTER MOON 

Date     MST   Event
        (h:m)

Jul 01  00:28  Jupiter 2.7°S of Moon
    03  13     Earth at Aphelion: 1.01668 AU
    04  17:21  Venus 6.5°S of Pleiades
    05  21:27  Moon at Apogee: 405934 km
    06  20:34  Saturn 3.2°S of Moon
    08  21:07  FULL MOON 
    09  18:33  Mercury 0.1°N of Beehive
    11  22:17  Moon at Descending Node 
    13  11:03  Venus 3.1°N of Aldebaran
    16  12:26  LAST QUARTER MOON 
    19  16:37  Aldebaran 0.4°S of Moon
    20  04:13  Venus 2.7°N of Moon
    21  10:09  Moon at Perigee: 361238 km
    23  02:46  NEW MOON 
    24  17:46  Moon at Ascending Node 
    25  01:49  Mercury 0.9°S of Moon: Occn.
    25  03:14  Regulus 0.0°S of Moon
    25  10:03  Mercury 0.8°S of Regulus
    26  17     Mars in Conjunction with Sun 
    27  20     Delta-Aquarid Meteor Shower
    28  13:15  Jupiter 3.1°S of Moon
    29  21     Mercury at Greatest Elong: 27.2°E
    30  08:23  FIRST QUARTER MOON 

Aug 02  06     Mercury at Aphelion 
    02  10:55  Moon at Apogee: 405026 km
    03  00:31  Saturn 3.5°S of Moon
    07  11:11  FULL MOON 
    07  11:20  Partial Lunar Eclipse; mag=0.246
    08  03:56  Moon at Descending Node 
    12  12     Perseid Meteor Shower
    14  18:15  LAST QUARTER MOON 
    15  23:39  Aldebaran 0.4°S of Moon
    18  06:14  Moon at Perigee: 366129 km
    18  21:45  Venus 2.2°N of Moon
    20  00:15  Beehive 3.2°N of Moon
    20  11:08  Venus 7.2°S of Pollux
    21  03:34  Moon at Ascending Node 
    21  11:26  Total Solar Eclipse; mag=1.031
    21  11:30  NEW MOON 
    25  06:00  Jupiter 3.5°S of Moon
    26  14     Mercury at Inferior Conjunction 
    29  01:13  FIRST QUARTER MOON 
    30  04:25  Moon at Apogee: 404307 km
    30  07:23  Saturn 3.6°S of Moon
    31  23:08  Venus 1.4°S of Beehive

Sep 04  11:41  Moon at Descending Node 
    04  17     Mercury 3.2° of Mars
    04  21     Neptune at Opposition 
    06  00:03  FULL MOON 
    09  22:30  Mercury 0.7°S of Regulus
    10  14:44  Jupiter 2.9°N of Spica
    12  03     Mercury at Greatest Elong: 17.9°W
    12  05:09  Aldebaran 0.4°S of Moon
    12  23:25  LAST QUARTER MOON 
    13  09:04  Moon at Perigee: 369856 km
    15  05     Mercury at Perihelion 
    16  07:50  Beehive 3.1°N of Moon
    16  11     Mercury 0.1° of Mars
    17  11:28  Moon at Ascending Node 
    17  17:56  Venus 0.5°N of Moon: Occn.
    17  21:32  Regulus 0.1°S of Moon
    18  16:22  Mercury 0.0°N of Moon: Occn.
    19  14:30  Venus 0.4°N of Regulus
    19  22:30  NEW MOON 
    22  00:51  Jupiter 3.7°S of Moon
    22  13:02  Autumnal Equinox 
    26  17:09  Saturn 3.5°S of Moon
    26  23:49  Moon at Apogee: 404342 km
    27  19:54  FIRST QUARTER MOON 

Oct 01  19:05  Moon at Descending Node 
    03  02     Venus at Perihelion 
    05  11:40  FULL MOON 
    07  17     Mars at Aphelion 
    08  14     Mercury at Superior Conjunction 
    08  22:51  Moon at Perigee: 366858 km
    09  11:05  Aldebaran 0.6°S of Moon
    12  05:25  LAST QUARTER MOON 
    13  13:29  Beehive 3.0°N of Moon
    14  15:10  Moon at Ascending Node 
    15  03:54  Regulus 0.2°S of Moon
    17  03:04  Mars 1.8°S of Moon
    17  17:21  Venus 2.0°S of Moon
    19  10     Uranus at Opposition 
    19  12:12  NEW MOON 
    21  04     Orionid Meteor Shower
    24  04:54  Saturn 3.3°S of Moon
    24  19:25  Moon at Apogee: 405151 km
    26  11     Jupiter in Conjunction with Sun 
    27  15:22  FIRST QUARTER MOON 
    28  23:41  Moon at Descending Node 

Nov 02  06:58  Venus 3.3°N of Spica
    03  22:23  FULL MOON 
    05  04     S Taurid Meteor Shower
    05  17:09  Moon at Perigee: 361438 km
    05  19:19  Aldebaran 0.8°S of Moon
    09  18:58  Beehive 2.7°N of Moon
    10  13:37  LAST QUARTER MOON 
    10  15:40  Moon at Ascending Node 
    11  09:07  Regulus 0.4°S of Moon
    12  04     N Taurid Meteor Shower
    12  10:50  Mercury 2.2°N of Antares
    14  17:40  Mars 3.2°S of Moon
    17  10     Leonid Meteor Shower
    18  04:42  NEW MOON 
    20  17:34  Saturn 3.0°S of Moon
    21  11:52  Moon at Apogee: 406132 km
    23  17     Mercury at Greatest Elong: 22.0°E
    25  01:22  Moon at Descending Node 
    26  10:03  FIRST QUARTER MOON 
    29  07:30  Mars 2.9°N of Spica

Dec 03  06:00  Aldebaran 0.8°S of Moon
    03  08:47  FULL MOON 
    04  01:42  Moon at Perigee: 357496 km
    06  17     Mercury 1.3° of Saturn
    07  02:30  Beehive 2.5°N of Moon
    07  17:39  Moon at Ascending Node 
    08  15:25  Regulus 0.7°S of Moon
    10  00:51  LAST QUARTER MOON 
    12  05     Mercury at Perihelion 
    12  19     Mercury at Inferior Conjunction 
    13  09:27  Mars 4.2°S of Moon
    13  23     Geminid Meteor Shower
    14  07:26  Jupiter 4.2°S of Moon
    17  23:31  NEW MOON 
    18  18:27  Moon at Apogee: 406605 km
    21  09:29  Winter Solstice 
    21  13     Saturn in Conjunction with Sun 
    22  03:04  Moon at Descending Node 
    22  08     Ursid Meteor Shower
    26  02:20  FIRST QUARTER MOON 
    30  17:25  Aldebaran 0.7°S of 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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