2017Calendar of Astronomical Events

    
2017Phases of the Moon
Alaska Standard Time
The following table gives the date and time of the Moon's phases for the year. The times listed are for Alaska Standard Time(Greenwich Mean Time - 9 hours).If Daylight Saving Time is in effect, add one hour to the times listed. 
   
      2017 Phases of the Moon   
      Alaska Standard Time
 New Moon  First Quarter  Full Moon  Last Quarter 
- Jan  5  10:47    Jan 12  02:34    Jan 19  13:14   
 Jan 27  15:07    Feb  3  19:19    Feb 10  15:33 n  Feb 18  10:33   
 Feb 26  05:58 A  Mar  5  02:32    Mar 12  05:54    Mar 20  06:58   
 Mar 27  17:57    Apr  3  09:39    Apr 10  21:08    Apr 19  00:57   
 Apr 26  03:16    May  2  17:47    May 10  12:43    May 18  15:33   
 May 25  10:44    Jun  1  03:42    Jun  9  04:10    Jun 17  02:33   
 Jun 23  17:31    Jun 30  15:51    Jul  8  19:07    Jul 16  10:26   
 Jul 23  00:46    Jul 30  06:23    Aug  7  09:11 p  Aug 14  16:15   
 Aug 21  09:30 T  Aug 28  23:13    Sep  5  22:03    Sep 12  21:25   
 Sep 19  20:30    Sep 27  17:54    Oct  5  09:40    Oct 12  03:25   
 Oct 19  10:12    Oct 27  13:22    Nov  3  20:23    Nov 10  11:37   
 Nov 18  02:42    Nov 26  08:03    Dec  3  06:47    Dec  9  22:51   
 Dec 17  21:31    Dec 26  00:20   --
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
Alaska Standard Time
The following table gives the date and time of the important astronomical events for the year. The times listed are for Alaska Standard Time(Greenwich Mean Time - 9 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   
   Alaska Standard Time  
 January - June   July - December 
Date     AKST   Even        (h:m)Jan 02  00:20  Venus 1.9°S of Moon    02  09:14  Moon at Descending Node     02  21:47  Mars 0.2°S of Moon: Occn.    03  05     Quadrantid Meteor Shower    04  06     Earth at Perihelion: 0.98331 AU    05  10:47  FIRST QUARTER MOON     09  00     Mercury 6.7°N of Saturn    09  05:07  Aldebaran 0.4°S of Moon    09  21:07  Moon at Perigee: 363242 km    12  02:34  FULL MOON     12  04     Venus at Greatest Elong: 47.1°E    13  04:59  Beehive 3.9°N of Moon    14  19:07  Regulus 0.9°N of Moon    15  01:44  Moon at Ascending Node     18  20:26  Jupiter 2.7°S of Moon    19  01     Mercury at Greatest Elong: 24.1°W    19  13:14  LAST QUARTER MOON     21  15:14  Moon at Apogee: 404913 km    24  01:37  Saturn 3.6°S of Moon    25  15:46  Mercury 3.7°S of Moon    27  15:07  NEW MOON     29  13:21  Moon at Descending Node     31  04:11  Jupiter 3.5°N of Spica    31  05:34  Venus 4.1°N of Moon    31  16:09  Mars 2.3°N of MoonFeb 02  04     Venus 5.4°N of Mars    03  19:19  FIRST QUARTER MOON     05  12:14  Aldebaran 0.2°S of Moon    06  04:59  Moon at Perigee: 368817 km    07  05     Mercury at Aphelion     09  14:46  Beehive 3.9°N of Moon    10  15:33  FULL MOON     10  15:44  Pen. Lunar Eclipse; mag=0.988    11  05:04  Regulus 0.8°N of Moon    11  10:49  Moon at Ascending Node     15  05:55  Jupiter 2.7°S of Moon    16  22     Jupiter at Aphelion:  5.45652 AU    18  10:33  LAST QUARTER MOON     18  12:14  Moon at Apogee: 404376 km    20  07     Venus at Perihelion     20  14:44  Saturn 3.6°S of Moon    25  21:28  Moon at Descending Node     26  05:53  Annular Solar Eclipse; mag=0.992    26  05:58  NEW MOON Mar 01  09:58  Mars 4.3°N of Moon    01  17     Neptune in Conjunction with Sun     02  22:24  Moon at Perigee: 369065 km    04  17:38  Aldebaran 0.2°S of Moon    05  02:32  FIRST QUARTER MOON     06  15     Mercury at Superior Conjunction     08  22:12  Beehive 3.9°N of Moon    10  13:20  Regulus 0.8°N of Moon    10  19:17  Moon at Ascending Node     12  05:54  FULL MOON     14  11:04  Jupiter 2.5°S of Moon    18  08:25  Moon at Apogee: 404651 km    20  01:29  Vernal Equinox     20  01:49  Saturn 3.4°S of Moon    20  06:58  LAST QUARTER MOON     23  05     Mercury at Perihelion     25  02     Venus at Inferior Conjunction     25  06:41  Moon at Descending Node     27  17:57  NEW MOON     30  03:39  Moon at Perigee: 363855 km    30  04:03  Mars 5.5°N of Moon    31  23:50  Aldebaran 0.3°S of MoonApr 01  01     Mercury at Greatest Elong: 19.0°E    03  09:39  FIRST QUARTER MOON     05  03:45  Beehive 3.8°N of Moon    06  19:30  Regulus 0.7°N of Moon    07  00:14  Moon at Ascending Node     07  12     Jupiter at Opposition     10  12:20  Jupiter 2.2°S of Moon    10  21:08  FULL MOON     13  21     Uranus in Conjunction with Sun     15  01:05  Moon at Apogee: 405478 km    16  09:39  Saturn 3.2°S of Moon    19  00:57  LAST QUARTER MOON     19  21     Mercury at Inferior Conjunction     20  23:16  Mars 3.4°S of Pleiades    21  13:30  Moon at Descending Node     22  03     Lyrid Meteor Shower    23  08:59  Venus 5.2°N of Moon    26  03:16  NEW MOON     27  07:18  Moon at Perigee: 359325 km    28  08:19  Aldebaran 0.5°S of MoonMay 02  09:23  Beehive 3.6°N of Moon    02  17:47  FIRST QUARTER MOON     04  00:49  Regulus 0.5°N of Moon    04  01:42  Moon at Ascending Node     04  16     Eta-Aquarid Meteor Shower    05  04:51  Mars 6.1°N of Aldebaran    07  12:24  Jupiter 2.1°S of Moon    10  12:43  FULL MOON     12  10:51  Moon at Apogee: 406212 km    13  14:07  Saturn 3.1°S of Moon    17  14     Mercury at Greatest Elong: 25.8°W    18  15:33  LAST QUARTER MOON     18  16:30  Moon at Descending Node     22  03:32  Venus 2.4°N of Moon    23  16:20  Mercury 1.6°N of Moon    25  10:44  NEW MOON     25  16:23  Moon at Perigee: 357210 km    29  16:50  Beehive 3.4°N of Moon    31  02:56  Moon at Ascending Node     31  07:08  Regulus 0.3°N of MoonJun 01  03:42  FIRST QUARTER MOON     03  02     Venus at Greatest Elong: 45.9°W    03  14:57  Jupiter 2.3°S of Moon    06  18:19  Mercury 5.3°S of Pleiades    08  13:21  Moon at Apogee: 406402 km    09  04:10  FULL MOON     09  16:25  Saturn 3.1°S of Moon    12  15     Venus at Aphelion     14  17:40  Moon at Descending Node     15  00     Saturn at Opposition     17  02:33  LAST QUARTER MOON     19  04     Mercury at Perihelion     20  12:13  Venus 2.4°N of Moon    20  19:25  Summer Solstice     21  05     Mercury at Superior Conjunction     22  05:23  Aldebaran 0.5°S of Moon    23  01:49  Moon at Perigee: 357938 km    23  17:31  NEW MOON     26  02:18  Beehive 3.2°N of Moon    27  07:26  Moon at Ascending Node     27  15:26  Regulus 0.1°N of Moon    30  15:51  FIRST QUARTER MOON     30  22:28  Jupiter 2.7°S of Moon
Date     AKST   Even        (h:m)Jul 03  11     Earth at Aphelion: 1.01668 AU    04  15:21  Venus 6.5°S of Pleiades    05  19:27  Moon at Apogee: 405934 km    06  18:34  Saturn 3.2°S of Moon    08  19:07  FULL MOON     09  16:33  Mercury 0.1°N of Beehive    11  20:17  Moon at Descending Node     13  09:03  Venus 3.1°N of Aldebaran    16  10:26  LAST QUARTER MOON     19  14:37  Aldebaran 0.4°S of Moon    20  02:13  Venus 2.7°N of Moon    21  08:09  Moon at Perigee: 361238 km    23  00:46  NEW MOON     24  15:46  Moon at Ascending Node     24  23:49  Mercury 0.9°S of Moon: Occn.    25  01:14  Regulus 0.0°S of Moon    25  08:03  Mercury 0.8°S of Regulus    26  15     Mars in Conjunction with Sun     27  18     Delta-Aquarid Meteor Shower    28  11:15  Jupiter 3.1°S of Moon    29  19     Mercury at Greatest Elong: 27.2°E    30  06:23  FIRST QUARTER MOON Aug 02  04     Mercury at Aphelion     02  08:55  Moon at Apogee: 405026 km    02  22:31  Saturn 3.5°S of Moon    07  09:11  FULL MOON     07  09:20  Partial Lunar Eclipse; mag=0.246    08  01:56  Moon at Descending Node     12  10     Perseid Meteor Shower    14  16:15  LAST QUARTER MOON     15  21:39  Aldebaran 0.4°S of Moon    18  04:14  Moon at Perigee: 366129 km    18  19:45  Venus 2.2°N of Moon    19  22:15  Beehive 3.2°N of Moon    20  09:08  Venus 7.2°S of Pollux    21  01:34  Moon at Ascending Node     21  09:26  Total Solar Eclipse; mag=1.031    21  09:30  NEW MOON     25  04:00  Jupiter 3.5°S of Moon    26  12     Mercury at Inferior Conjunction     28  23:13  FIRST QUARTER MOON     30  02:25  Moon at Apogee: 404307 km    30  05:23  Saturn 3.6°S of Moon    31  21:08  Venus 1.4°S of BeehiveSep 04  09:41  Moon at Descending Node     04  15     Mercury 3.2°S of Mars    04  19     Neptune at Opposition     05  22:03  FULL MOON     09  20:30  Mercury 0.7°S of Regulus    10  12:44  Jupiter 2.9°N of Spica    12  01     Mercury at Greatest Elong: 17.9°W    12  03:09  Aldebaran 0.4°S of Moon    12  21:25  LAST QUARTER MOON     13  07:04  Moon at Perigee: 369856 km    15  03     Mercury at Perihelion     16  05:50  Beehive 3.1°N of Moon    16  09     Mercury 0.1°N of Mars    17  09:28  Moon at Ascending Node     17  15:56  Venus 0.5°N of Moon: Occn.    17  19:32  Regulus 0.1°S of Moon    18  14:22  Mercury 0.0°N of Moon: Occn.    19  12:30  Venus 0.4°N of Regulus    19  20:30  NEW MOON     21  22:51  Jupiter 3.7°S of Moon    22  11:02  Autumnal Equinox     26  15:09  Saturn 3.5°S of Moon    26  21:49  Moon at Apogee: 404342 km    27  17:54  FIRST QUARTER MOON Oct 01  17:05  Moon at Descending Node     03  00     Venus at Perihelion     05  07     Venus 0.2°N of Mars    05  09:40  FULL MOON     07  13     Mars at Aphelion:  1.66609 AU    08  12     Mercury at Superior Conjunction     08  20:51  Moon at Perigee: 366858 km    09  09:05  Aldebaran 0.6°S of Moon    12  03:25  LAST QUARTER MOON     13  11:29  Beehive 3.0°N of Moon    14  13:10  Moon at Ascending Node     15  01:54  Regulus 0.2°S of Moon    17  01:04  Mars 1.8°S of Moon    17  15:21  Venus 2.0°S of Moon    19  08     Uranus at Opposition     19  10:12  NEW MOON     21  02     Orionid Meteor Shower    24  02:54  Saturn 3.3°S of Moon    24  17:25  Moon at Apogee: 405151 km    26  09     Jupiter in Conjunction with Sun     27  13:22  FIRST QUARTER MOON     28  21:41  Moon at Descending Node Nov 02  04:58  Venus 3.3°N of Spica    03  20:23  FULL MOON     05  02     S Taurid Meteor Shower    05  15:09  Moon at Perigee: 361438 km    05  17:19  Aldebaran 0.8°S of Moon    09  16:58  Beehive 2.7°N of Moon    10  11:37  LAST QUARTER MOON     10  13:40  Moon at Ascending Node     11  07:07  Regulus 0.4°S of Moon    12  02     N Taurid Meteor Shower    12  08:50  Mercury 2.2°N of Antares    12  23     Venus 0.3°N of Jupiter    14  15:40  Mars 3.2°S of Moon    17  08     Leonid Meteor Shower    18  02:42  NEW MOON     20  15:34  Saturn 3.0°S of Moon    21  09:52  Moon at Apogee: 406132 km    23  15     Mercury at Greatest Elong: 22.0°E    24  23:22  Moon at Descending Node     26  08:03  FIRST QUARTER MOON     29  05:30  Mars 2.9°N of SpicaDec 03  04:00  Aldebaran 0.8°S of Moon    03  06:47  FULL MOON     03  23:42  Moon at Perigee: 357496 km    06  15     Mercury 1.3°S of Saturn    07  00:30  Beehive 2.5°N of Moon    07  15:39  Moon at Ascending Node     08  13:25  Regulus 0.7°S of Moon    09  22:51  LAST QUARTER MOON     12  03     Mercury at Perihelion     12  17     Mercury at Inferior Conjunction     13  07:27  Mars 4.2°S of Moon    13  21     Geminid Meteor Shower    14  05:26  Jupiter 4.2°S of Moon    17  21:31  NEW MOON     18  16:27  Moon at Apogee: 406605 km    21  07:29  Winter Solstice     21  11     Saturn in Conjunction with Sun     22  01:04  Moon at Descending Node     22  06     Ursid Meteor Shower    26  00:20  FIRST QUARTER MOON     30  15:25  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