Events for December 2017

The following table gives the date and time of important astronomical events for December 2017.

The time of each event is given in Greenwich Mean Time or GMT (a.k.a. Universal Time or UT). To convert GMT to Eastern Standard Time (EST) just subtract 5 hours. To convert GMT to other time zones, visit Time Zones. Some of the astronomical terms used in the calendar are explained in Definitions.

 Date    GMT   Astronomical Events for December 2017
------  -----  --------------------------------------------
        (h:m)
Dec 03  13:00  Aldebaran 0.8°S of Moon
Dec 03  15:47  FULL MOON 
Dec 04  08:42  Moon at Perigee: 357496 km
Dec 07  00     Mercury 1.3° of Saturn
Dec 07  09:30  Beehive 2.5°N of Moon
Dec 08  00:39  Moon at Ascending Node 
Dec 08  22:25  Regulus 0.7°S of Moon
Dec 10  07:51  LAST QUARTER MOON 
Dec 12  12     Mercury at Perihelion 
Dec 13  02     Mercury at Inferior Conjunction 
Dec 13  16:27  Mars 4.2°S of Moon
Dec 14  06     Geminid Meteor Shower
Dec 14  14:26  Jupiter 4.2°S of Moon
Dec 18  06:31  NEW MOON 
Dec 19  01:27  Moon at Apogee: 406605 km
Dec 21  16:29  Winter Solstice 
Dec 21  20     Saturn in Conjunction with Sun 
Dec 22  10:04  Moon at Descending Node 
Dec 22  15     Ursid Meteor Shower
Dec 26  09:20  FIRST QUARTER MOON 
Dec 31  00:25  Aldebaran 0.7°S of Moon

As the events above transpire, I will post photographs of some of them at Recent Images.

Astronomical events calendars for complete years and for eight time zones are available through the links below.

Time Zones Calendars of Astronomical Events
Greenwich Mean Time 2017 2018 2019 2020 2021 2022
Atlantic Standard Time 2017 2018 2019 2020 2021 2022
Eastern Standard Time 2017 2018 2019 2020 2021 2022
Central Standard Time 2017 2018 2019 2020 2021 2022
Mountain Standard Time 2017 2018 2019 2020 2021 2022
Pacific Standard Time 2017 2018 2019 2020 2021 2022
Alaska Standard Time 2017 2018 2019 2020 2021 2022
Hawaii Standard Time 2017 2018 2019 2020 2021 2022

For additional years, see Calendars of Astronomical Events.

The astronomical highlight of 2017 is the Great American Total Solar Eclipse on August 21. This is the first total eclipse visible from the continental USA in 38 years. For complete details on this highly anticipated event, see: 2017 Total Solar Eclipse (EclipseWise.com).

For information on all solar and lunar eclipses this year, see: Eclipses During 2017.

The Calendars of Astronomical Events were all generated by a computer program I wrote (with THINK Pascal running on a Macintosh G4) using Astronomical Algorithms (Jean Meeus).

Fred Espenak



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