2017Calendar of Astronomical Events

    
2017Phases of the Moon
Mountain Standard Time
The following table gives the date and time of the Moon's phases for the year. The times listed are for Mountain Standard Time(Greenwich Mean Time - 7 hours).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.
2017Calendar of Astronomical Events
Mountain Standard Time
The following table gives the date and time of the important astronomical events for the year. The times listed are for Mountain Standard Time(Greenwich Mean Time - 7 hours).If Daylight Saving Time is in effect, add one hour to the times listed. A key to astronomical terms appears below the calendar.
   
      2017Calendar of Astronomical Events   
   Mountain Standard Time  
 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°N 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 MoonFeb 02  06     Venus 5.4°N of Mars    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    17  00     Jupiter at Aphelion:  5.45652 AU    18  12:33  LAST QUARTER MOON     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 MoonApr 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 MoonMay 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 MoonJun 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 BeehiveSep 04  11:41  Moon at Descending Node     04  17     Mercury 3.2°S 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°N 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  09     Venus 0.2°N of Mars    05  11:40  FULL MOON     07  15     Mars at Aphelion:  1.66609 AU    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    13  01     Venus 0.3°N of Jupiter    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 SpicaDec 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°S 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    

 Terms Used in Astronomical Events Calendar 
  • Perihelion - instant when a planet is closest to the Sun
  • Aphelion - instant when a planet is furthest from the Sun
  • Perigee - instant when the Moon is closest to Earth
  • Apogee - instant when the Moon is furthest from Earth
  • Inferior Conjunction - instant when a planet (Mercury or Venus) passes between Earth and the Sun
  • Superior Conjunction - instant when a planet (Mercury or Venus) passes on the opposite side of the Sun from Earth 
  • Greatest Elongation - the maximum angular separation between the Sun and the planet (Mercury or Venus) 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 - instant when a planet appears opposite the Sun as seen from Earth
  • Conjunction - instant when a planet appears closest the Sun as seen from Earth
  • Occultation - the Moon occults or eclipses a star or planet
  • Ascending Node - point where the Moon crosses from the southern to northern portion of its orbit
  • Descending Node - point where the Moon crosses from the northern to the southern portion of its orbit

  • Aldebaran - bright star in the constellation Taurus
  • Pollux - bright star in the constellation Gemini
  • Regulus - bright star in the constellation Leo
  • Spica - bright star in the constellation Virgo
  • Antares - bright star in the constellation Scorpius
  • Pleiades - bright star cluster in the constellation Taurus
  • Beehive - bright star cluster in the constellation Cancer
Calendars of Astronomical Events: 2011 to 2020
The Americas
Below are links to calendars of astronomical events from 2011 to 2020 for seven time zones in the Americas. 
Choose a time zone and click on a year to get a calendar of astronomical events for that year.
   Calendars of Astronomical Events - The Americas
   AST    2011     2012     2013     2014     2015     2016     2017     2018     2019     2020 
   EST    2011     2012     2013     2014     2015     2016     2017     2018     2019     2020 
   CST    2011     2012     2013     2014     2015     2016     2017     2018     2019     2020 
   MST    2011     2012     2013     2014     2015     2016     2017     2018     2019     2020 
   PST    2011     2012     2013     2014     2015     2016     2017     2018     2019     2020 
   AKST    2011     2012     2013     2014     2015     2016     2017     2018     2019     2020 
   HST    2011     2012     2013     2014     2015     2016     2017     2018     2019     2020 
        Time Zones Abbreviations
        • AST = Atlantic Standard Time (= GMT - 4 hours)
        • EST = Eastern Standard Time (= GMT - 5 hours)
        • CST = Central Standard Time (= GMT - 6 hours)
        • MST = Mountain Standard Time (= GMT - 7 hours)
        • PST = Pacific Standard Time (= GMT - 8 hours)
        • AKST = Alaskan Standard Time (= GMT - 9 hours)
        • HST = Hawaiian Standard Time (= GMT - 10 hours)
           (where GMT = Greenwich Mean Time)
A time zone may have a different name in different countries. Note the difference in hours between a given time zone and Greenwich Mean Time to help in identification.
For other years and other time zones, visit: Calendars of Astronomical Events.
 
Accuracy of the Astronomical Events Calendars
The goal of the Astronomical Events Calendars is to present a wide range of solar system phenomena with reasonable accuracy. In general, events listed to the nearest hour are accurate to ± 30 minutes.Events listed with a precision in hours and minutes (i.e., hh:mm) are typically accurate to ± 5 minutes or less.  
The following table gives a more detailed breakdown of the accuracy of times for various astronomical events.
Accuracy of the Astronomical Events Calendars
 Solstice/Equinox (Earth)  ± 0.5 minute 
 Aphelion/Perihelion (Earth)  ± 30 minutes;  ± 0.00001 AU 
 Solar and Lunar Eclipses   ± 0.5 minute 
 Phases of the Moon  ± 0.5 minute 
 Moon at Nodes  ± 2 minutes 
 Apogee/Perigee of Moon  ± 5 minutes; ± 5 kilometers 
 Conjunctions of Moon with Star or Planet  ± 10 minutes 
 Conjunctions of Planet with Planet  ± 3 hours 
 Inferior/Superior Conjunctions (Mercury & Venus)  ± 30 minutes 
 Greatest Elongation (Mercury & Venus)  ± 30 minutes 
 Opposition/Conjunction (Outer Planets)  ± 3 hours 
 Aphelion/Perihelion of Planets  ± 30 minutes 

Acknowledgements
All calculations are by Fred Espenak and he assumes full responsibility for their accuracy. Algorithms used in predicting many of the astronomical events 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: 

Return to: Calendars of Astronomical Events
Return to: Planetary Ephemeris Data