2017Calendar of Astronomical Events

    
2017Phases of the Moon
Atlantic Standard Time
The following table gives the date and time of the Moon's phases for the year. The times listed are for Atlantic Standard Time(Greenwich Mean Time - 4 hours).If Daylight Saving Time is in effect, add one hour to the times listed. 
   
      2017 Phases of the Moon   
      Atlantic Standard Time
 New Moon  First Quarter  Full Moon  Last Quarter 
- Jan  5  15:47    Jan 12  07:34    Jan 19  18:14   
 Jan 27  20:07    Feb  4  00:19    Feb 10  20:33 n  Feb 18  15:33   
 Feb 26  10:58 A  Mar  5  07:32    Mar 12  10:54    Mar 20  11:58   
 Mar 27  22:57    Apr  3  14:39    Apr 11  02:08    Apr 19  05:57   
 Apr 26  08:16    May  2  22:47    May 10  17:43    May 18  20:33   
 May 25  15:44    Jun  1  08:42    Jun  9  09:10    Jun 17  07:33   
 Jun 23  22:31    Jun 30  20:51    Jul  9  00:07    Jul 16  15:26   
 Jul 23  05:46    Jul 30  11:23    Aug  7  14:11 p  Aug 14  21:15   
 Aug 21  14:30 T  Aug 29  04:13    Sep  6  03:03    Sep 13  02:25   
 Sep 20  01:30    Sep 27  22:54    Oct  5  14:40    Oct 12  08:25   
 Oct 19  15:12    Oct 27  18:22    Nov  4  01:23    Nov 10  16:37   
 Nov 18  07:42    Nov 26  13:03    Dec  3  11:47    Dec 10  03:51   
 Dec 18  02:31    Dec 26  05:20   --
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
Atlantic Standard Time
The following table gives the date and time of the important astronomical events for the year. The times listed are for Atlantic Standard Time(Greenwich Mean Time - 4 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   
   Atlantic Standard Time  
 January - June   July - December 
Date     AST   Event        (h:m)Jan 02  05:20  Venus 1.9°S of Moon    02  14:14  Moon at Descending Node     03  02:47  Mars 0.2°S of Moon: Occn.    03  10     Quadrantid Meteor Shower    04  11     Earth at Perihelion: 0.98331 AU    05  15:47  FIRST QUARTER MOON     09  05     Mercury 6.7°N of Saturn    09  10:07  Aldebaran 0.4°S of Moon    10  02:07  Moon at Perigee: 363242 km    12  07:34  FULL MOON     12  09     Venus at Greatest Elong: 47.1°E    13  09:59  Beehive 3.9°N of Moon    15  00:07  Regulus 0.9°N of Moon    15  06:44  Moon at Ascending Node     19  01:26  Jupiter 2.7°S of Moon    19  06     Mercury at Greatest Elong: 24.1°W    19  18:14  LAST QUARTER MOON     21  20:14  Moon at Apogee: 404913 km    24  06:37  Saturn 3.6°S of Moon    25  20:46  Mercury 3.7°S of Moon    27  20:07  NEW MOON     29  18:21  Moon at Descending Node     31  09:11  Jupiter 3.5°N of Spica    31  10:34  Venus 4.1°N of Moon    31  21:09  Mars 2.3°N of MoonFeb 02  09     Venus 5.4°N of Mars    04  00:19  FIRST QUARTER MOON     05  17:14  Aldebaran 0.2°S of Moon    06  09:59  Moon at Perigee: 368817 km    07  10     Mercury at Aphelion     09  19:46  Beehive 3.9°N of Moon    10  20:33  FULL MOON     10  20:44  Pen. Lunar Eclipse; mag=0.988    11  10:04  Regulus 0.8°N of Moon    11  15:49  Moon at Ascending Node     15  10:55  Jupiter 2.7°S of Moon    17  03     Jupiter at Aphelion:  5.45652 AU    18  15:33  LAST QUARTER MOON     18  17:14  Moon at Apogee: 404376 km    20  12     Venus at Perihelion     20  19:44  Saturn 3.6°S of Moon    26  02:28  Moon at Descending Node     26  10:53  Annular Solar Eclipse; mag=0.992    26  10:58  NEW MOON Mar 01  14:58  Mars 4.3°N of Moon    01  22     Neptune in Conjunction with Sun     03  03:24  Moon at Perigee: 369065 km    04  22:38  Aldebaran 0.2°S of Moon    05  07:32  FIRST QUARTER MOON     06  20     Mercury at Superior Conjunction     09  03:12  Beehive 3.9°N of Moon    10  18:20  Regulus 0.8°N of Moon    11  00:17  Moon at Ascending Node     12  10:54  FULL MOON     14  16:04  Jupiter 2.5°S of Moon    18  13:25  Moon at Apogee: 404651 km    20  06:29  Vernal Equinox     20  06:49  Saturn 3.4°S of Moon    20  11:58  LAST QUARTER MOON     23  10     Mercury at Perihelion     25  07     Venus at Inferior Conjunction     25  11:41  Moon at Descending Node     27  22:57  NEW MOON     30  08:39  Moon at Perigee: 363855 km    30  09:03  Mars 5.5°N of MoonApr 01  04:50  Aldebaran 0.3°S of Moon    01  06     Mercury at Greatest Elong: 19.0°E    03  14:39  FIRST QUARTER MOON     05  08:45  Beehive 3.8°N of Moon    07  00:30  Regulus 0.7°N of Moon    07  05:14  Moon at Ascending Node     07  17     Jupiter at Opposition     10  17:20  Jupiter 2.2°S of Moon    11  02:08  FULL MOON     14  02     Uranus in Conjunction with Sun     15  06:05  Moon at Apogee: 405478 km    16  14:39  Saturn 3.2°S of Moon    19  05:57  LAST QUARTER MOON     20  02     Mercury at Inferior Conjunction     21  04:16  Mars 3.4°S of Pleiades    21  18:30  Moon at Descending Node     22  08     Lyrid Meteor Shower    23  13:59  Venus 5.2°N of Moon    26  08:16  NEW MOON     27  12:18  Moon at Perigee: 359325 km    28  13:19  Aldebaran 0.5°S of MoonMay 02  14:23  Beehive 3.6°N of Moon    02  22:47  FIRST QUARTER MOON     04  05:49  Regulus 0.5°N of Moon    04  06:42  Moon at Ascending Node     04  21     Eta-Aquarid Meteor Shower    05  09:51  Mars 6.1°N of Aldebaran    07  17:24  Jupiter 2.1°S of Moon    10  17:43  FULL MOON     12  15:51  Moon at Apogee: 406212 km    13  19:07  Saturn 3.1°S of Moon    17  19     Mercury at Greatest Elong: 25.8°W    18  20:33  LAST QUARTER MOON     18  21:30  Moon at Descending Node     22  08:32  Venus 2.4°N of Moon    23  21:20  Mercury 1.6°N of Moon    25  15:44  NEW MOON     25  21:23  Moon at Perigee: 357210 km    29  21:50  Beehive 3.4°N of Moon    31  07:56  Moon at Ascending Node     31  12:08  Regulus 0.3°N of MoonJun 01  08:42  FIRST QUARTER MOON     03  07     Venus at Greatest Elong: 45.9°W    03  19:57  Jupiter 2.3°S of Moon    06  23:19  Mercury 5.3°S of Pleiades    08  18:21  Moon at Apogee: 406402 km    09  09:10  FULL MOON     09  21:25  Saturn 3.1°S of Moon    12  20     Venus at Aphelion     14  22:40  Moon at Descending Node     15  05     Saturn at Opposition     17  07:33  LAST QUARTER MOON     19  09     Mercury at Perihelion     20  17:13  Venus 2.4°N of Moon    21  00:25  Summer Solstice     21  10     Mercury at Superior Conjunction     22  10:23  Aldebaran 0.5°S of Moon    23  06:49  Moon at Perigee: 357938 km    23  22:31  NEW MOON     26  07:18  Beehive 3.2°N of Moon    27  12:26  Moon at Ascending Node     27  20:26  Regulus 0.1°N of Moon    30  20:51  FIRST QUARTER MOON 
Date     AST   Event        (h:m)Jul 01  03:28  Jupiter 2.7°S of Moon    03  16     Earth at Aphelion: 1.01668 AU    04  20:21  Venus 6.5°S of Pleiades    06  00:27  Moon at Apogee: 405934 km    06  23:34  Saturn 3.2°S of Moon    09  00:07  FULL MOON     09  21:33  Mercury 0.1°N of Beehive    12  01:17  Moon at Descending Node     13  14:03  Venus 3.1°N of Aldebaran    16  15:26  LAST QUARTER MOON     19  19:37  Aldebaran 0.4°S of Moon    20  07:13  Venus 2.7°N of Moon    21  13:09  Moon at Perigee: 361238 km    23  05:46  NEW MOON     24  20:46  Moon at Ascending Node     25  04:49  Mercury 0.9°S of Moon: Occn.    25  06:14  Regulus 0.0°S of Moon    25  13:03  Mercury 0.8°S of Regulus    26  20     Mars in Conjunction with Sun     27  23     Delta-Aquarid Meteor Shower    28  16:15  Jupiter 3.1°S of Moon    30  00     Mercury at Greatest Elong: 27.2°E    30  11:23  FIRST QUARTER MOON Aug 02  09     Mercury at Aphelion     02  13:55  Moon at Apogee: 405026 km    03  03:31  Saturn 3.5°S of Moon    07  14:11  FULL MOON     07  14:20  Partial Lunar Eclipse; mag=0.246    08  06:56  Moon at Descending Node     12  15     Perseid Meteor Shower    14  21:15  LAST QUARTER MOON     16  02:39  Aldebaran 0.4°S of Moon    18  09:14  Moon at Perigee: 366129 km    19  00:45  Venus 2.2°N of Moon    20  03:15  Beehive 3.2°N of Moon    20  14:08  Venus 7.2°S of Pollux    21  06:34  Moon at Ascending Node     21  14:26  Total Solar Eclipse; mag=1.031    21  14:30  NEW MOON     25  09:00  Jupiter 3.5°S of Moon    26  17     Mercury at Inferior Conjunction     29  04:13  FIRST QUARTER MOON     30  07:25  Moon at Apogee: 404307 km    30  10:23  Saturn 3.6°S of MoonSep 01  02:08  Venus 1.4°S of Beehive    04  14:41  Moon at Descending Node     04  20     Mercury 3.2°S of Mars    05  00     Neptune at Opposition     06  03:03  FULL MOON     10  01:30  Mercury 0.7°S of Regulus    10  17:44  Jupiter 2.9°N of Spica    12  06     Mercury at Greatest Elong: 17.9°W    12  08:09  Aldebaran 0.4°S of Moon    13  02:25  LAST QUARTER MOON     13  12:04  Moon at Perigee: 369856 km    15  08     Mercury at Perihelion     16  10:50  Beehive 3.1°N of Moon    16  14     Mercury 0.1°N of Mars    17  14:28  Moon at Ascending Node     17  20:56  Venus 0.5°N of Moon: Occn.    18  00:32  Regulus 0.1°S of Moon    18  19:22  Mercury 0.0°N of Moon: Occn.    19  17:30  Venus 0.4°N of Regulus    20  01:30  NEW MOON     22  03:51  Jupiter 3.7°S of Moon    22  16:02  Autumnal Equinox     26  20:09  Saturn 3.5°S of Moon    27  02:49  Moon at Apogee: 404342 km    27  22:54  FIRST QUARTER MOON Oct 01  22:05  Moon at Descending Node     03  05     Venus at Perihelion     05  12     Venus 0.2°N of Mars    05  14:40  FULL MOON     07  18     Mars at Aphelion:  1.66609 AU    08  17     Mercury at Superior Conjunction     09  01:51  Moon at Perigee: 366858 km    09  14:05  Aldebaran 0.6°S of Moon    12  08:25  LAST QUARTER MOON     13  16:29  Beehive 3.0°N of Moon    14  18:10  Moon at Ascending Node     15  06:54  Regulus 0.2°S of Moon    17  06:04  Mars 1.8°S of Moon    17  20:21  Venus 2.0°S of Moon    19  13     Uranus at Opposition     19  15:12  NEW MOON     21  07     Orionid Meteor Shower    24  07:54  Saturn 3.3°S of Moon    24  22:25  Moon at Apogee: 405151 km    26  14     Jupiter in Conjunction with Sun     27  18:22  FIRST QUARTER MOON     29  02:41  Moon at Descending Node Nov 02  09:58  Venus 3.3°N of Spica    04  01:23  FULL MOON     05  07     S Taurid Meteor Shower    05  20:09  Moon at Perigee: 361438 km    05  22:19  Aldebaran 0.8°S of Moon    09  21:58  Beehive 2.7°N of Moon    10  16:37  LAST QUARTER MOON     10  18:40  Moon at Ascending Node     11  12:07  Regulus 0.4°S of Moon    12  07     N Taurid Meteor Shower    12  13:50  Mercury 2.2°N of Antares    13  04     Venus 0.3°N of Jupiter    14  20:40  Mars 3.2°S of Moon    17  13     Leonid Meteor Shower    18  07:42  NEW MOON     20  20:34  Saturn 3.0°S of Moon    21  14:52  Moon at Apogee: 406132 km    23  20     Mercury at Greatest Elong: 22.0°E    25  04:22  Moon at Descending Node     26  13:03  FIRST QUARTER MOON     29  10:30  Mars 2.9°N of SpicaDec 03  09:00  Aldebaran 0.8°S of Moon    03  11:47  FULL MOON     04  04:42  Moon at Perigee: 357496 km    06  20     Mercury 1.3°S of Saturn    07  05:30  Beehive 2.5°N of Moon    07  20:39  Moon at Ascending Node     08  18:25  Regulus 0.7°S of Moon    10  03:51  LAST QUARTER MOON     12  08     Mercury at Perihelion     12  22     Mercury at Inferior Conjunction     13  12:27  Mars 4.2°S of Moon    14  02     Geminid Meteor Shower    14  10:26  Jupiter 4.2°S of Moon    18  02:31  NEW MOON     18  21:27  Moon at Apogee: 406605 km    21  12:29  Winter Solstice     21  16     Saturn in Conjunction with Sun     22  06:04  Moon at Descending Node     22  11     Ursid Meteor Shower    26  05:20  FIRST QUARTER MOON     30  20:25  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