2018 Calendar of Astronomical Events



2018 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.

2018 Phases of the Moon
Mountain Standard Time
New Moon First Quarter Full Moon Last Quarter
-- Jan 1 19:24 Jan 8 15:25
Jan 16 19:17 Jan 24 15:20 Jan 31 06:27 t Feb 7 08:54
Feb 15 14:05 P Feb 23 01:09 Mar 1 17:51 Mar 9 04:20
Mar 17 06:12 Mar 24 08:35 Mar 31 05:37 Apr 8 00:18
Apr 15 18:57 Apr 22 14:46 Apr 29 17:58 May 7 19:09
May 15 04:48 May 21 20:49 May 29 07:20 Jun 6 11:32
Jun 13 12:43 Jun 20 03:51 Jun 27 21:53 Jul 6 00:51
Jul 12 19:48 P Jul 19 12:52 Jul 27 13:20 t Aug 4 11:18
Aug 11 02:58 P Aug 18 00:49 Aug 26 04:56 Sep 2 19:37
Sep 9 11:01 Sep 16 16:15 Sep 24 19:53 Oct 2 02:45
Oct 8 20:47 Oct 16 11:02 Oct 24 09:45 Oct 31 09:40
Nov 7 09:02 Nov 15 07:54 Nov 22 22:39 Nov 29 17:19
Dec 7 00:20 Dec 15 04:49 Dec 22 10:49 Dec 29 02:34

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.



2018 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.

2018 Calendar of Astronomical Events
January - June July - December
Date     MST   Event
        (h:m)

Jan 01  13     Mercury at Greatest Elong: 22.7°W
    01  14:54  Moon at Perigee: 356566 km
    01  19:24  FULL MOON 
    02  23     Earth at Perihelion: 0.98329 AU
    03  12:50  Beehive 2.3°N of Moon
    03  13     Quadrantid Meteor Shower
    04  00:48  Moon at Ascending Node 
    05  00:24  Regulus 0.9°S of Moon
    08  15:25  LAST QUARTER MOON 
    08  23     Venus at Superior Conjunction 
    10  22:59  Jupiter 4.3°S of Moon
    11  03:03  Mars 4.6°S of Moon
    13  01     Mercury 0.7° of Saturn
    14  19:10  Moon at Apogee: 406461 km
    14  19:13  Saturn 2.6°S of Moon
    15  00:24  Mercury 3.4°S of Moon
    16  19:17  NEW MOON 
    18  07:28  Moon at Descending Node 
    23  10     Venus at Aphelion 
    24  15:20  FIRST QUARTER MOON 
    25  04     Mercury at Aphelion 
    27  03:09  Aldebaran 0.7°S of Moon
    30  02:54  Moon at Perigee: 358995 km
    31  00:19  Beehive 2.3°N of Moon
    31  06:27  FULL MOON 
    31  06:30  Total Lunar Eclipse; mag=1.315
    31  11:46  Moon at Ascending Node 

Feb 01  11:24  Regulus 0.9°S of Moon
    07  08:54  LAST QUARTER MOON 
    07  12:47  Jupiter 4.3°S of Moon
    08  22:12  Mars 4.4°S of Moon
    11  07:16  Moon at Apogee: 405701 km
    11  07:46  Saturn 2.5°S of Moon
    11  09:40  Mars 5.0°N of Antares
    14  14:11  Moon at Descending Node 
    15  13:51  Partial Solar Eclipse; mag=0.599
    15  14:05  NEW MOON 
    17  05     Mercury at Superior Conjunction 
    23  01:09  FIRST QUARTER MOON 
    23  10:07  Aldebaran 0.7°S of Moon
    27  07:48  Moon at Perigee: 363938 km
    27  10:28  Beehive 2.3°N of Moon
    27  22:03  Moon at Ascending Node 
    28  22:09  Regulus 0.9°S of Moon

Mar 01  17:51  FULL MOON 
    03  23     Mercury 1.1° of Venus
    04  07     Neptune in Conjunction with Sun 
    06  23:57  Jupiter 4.1°S of Moon
    09  04:20  LAST QUARTER MOON 
    09  17:37  Mars 3.8°S of Moon
    10  04     Mercury at Perihelion 
    10  19:37  Saturn 2.2°S of Moon
    11  02:13  Moon at Apogee: 404682 km
    13  20:47  Moon at Descending Node 
    15  08     Mercury at Greatest Elong: 18.4°E
    17  06:12  NEW MOON 
    18  12:07  Venus 3.7°N of Moon
    19  01     Mercury 3.8° of Venus
    20  09:15  Vernal Equinox 
    22  15:33  Aldebaran 0.9°S of Moon
    24  08:35  FIRST QUARTER MOON 
    26  10:17  Moon at Perigee: 369104 km
    26  17:52  Beehive 2.2°N of Moon
    27  03:56  Moon at Ascending Node 
    28  06:38  Regulus 1.0°S of Moon
    31  05:37  FULL MOON 

Apr 01  11     Mercury at Inferior Conjunction 
    03  07:14  Jupiter 3.9°S of Moon
    03  10     Saturn at Aphelion 
    07  05:50  Saturn 1.9°S of Moon
    07  11:15  Mars 3.1°S of Moon
    07  22:32  Moon at Apogee: 404145 km
    08  00:18  LAST QUARTER MOON 
    10  01:09  Moon at Descending Node 
    14  02:24  Mercury 3.9°N of Moon
    15  18:57  NEW MOON 
    17  12:29  Venus 5.4°N of Moon
    18  08     Uranus in Conjunction with Sun 
    18  21:45  Aldebaran 1.1°S of Moon
    20  07:44  Moon at Perigee: 368713 km
    22  11     Lyrid Meteor Shower
    22  14:46  FIRST QUARTER MOON 
    22  23:17  Beehive 1.9°N of Moon
    23  05:19  Moon at Ascending Node 
    24  09:47  Venus 3.4°S of Pleiades
    24  12:39  Regulus 1.2°S of Moon
    29  11     Mercury at Greatest Elong: 27.0°W
    29  17:58  FULL MOON 
    30  10:16  Jupiter 3.8°S of Moon

May 02  06:29  Venus 6.3°N of Aldebaran
    04  13:31  Saturn 1.7°S of Moon
    05  00     Eta-Aquarid Meteor Shower
    05  17:35  Moon at Apogee: 404458 km
    06  00:24  Mars 2.7°S of Moon
    07  03:23  Moon at Descending Node 
    07  19:09  LAST QUARTER MOON 
    08  17     Jupiter at Opposition 
    13  10:21  Mercury 2.4°N of Moon
    15  04:48  NEW MOON 
    15  18     Venus at Perihelion 
    17  11:11  Venus 4.8°N of Moon
    17  14:06  Moon at Perigee: 363777 km
    20  04:57  Beehive 1.7°N of Moon
    20  06:13  Moon at Ascending Node 
    21  17:53  Regulus 1.4°S of Moon
    21  20:49  FIRST QUARTER MOON 
    27  10:39  Jupiter 4.0°S of Moon
    29  07:20  FULL MOON 
    31  18:20  Saturn 1.6°S of Moon

Jun 02  09:34  Moon at Apogee: 405316 km
    03  04:58  Mars 3.2°S of Moon
    03  05:39  Moon at Descending Node 
    05  19     Mercury at Superior Conjunction 
    06  03     Mercury at Perihelion 
    06  11:32  LAST QUARTER MOON 
    07  20:37  Venus 4.6°S of Pollux
    13  12:43  NEW MOON 
    14  16:55  Moon at Perigee: 359507 km
    16  06:13  Venus 2.3°N of Moon
    16  10:50  Moon at Ascending Node 
    16  12:38  Beehive 1.5°N of Moon
    18  00:25  Regulus 1.7°S of Moon
    19  19:21  Venus 0.4°N of Beehive
    20  03:51  FIRST QUARTER MOON 
    21  03:07  Summer Solstice 
    23  11:47  Jupiter 4.2°S of Moon
    24  14:37  Mercury 4.7°S of Pollux
    27  05     Saturn at Opposition 
    27  20:59  Saturn 1.8°S of Moon
    27  21:53  FULL MOON 
    29  19:43  Moon at Apogee: 406061 km
    30  09:44  Moon at Descending Node 
    30  18:43  Mars 4.8°S of Moon

Date     MST   Event
        (h:m)

Jul 03  22:39  Mercury 0.6°S of Beehive
    06  00:51  LAST QUARTER MOON 
    06  10     Earth at Aphelion: 1.01670 AU
    09  16:34  Venus 0.9°N of Regulus
    10  02:30  Aldebaran 1.1°S of Moon
    11  22     Mercury at Greatest Elong: 26.4°E
    12  19:48  NEW MOON 
    12  20:01  Partial Solar Eclipse; mag=0.337
    13  01:28  Moon at Perigee: 357432 km
    13  19:50  Moon at Ascending Node 
    14  15:04  Mercury 2.2°S of Moon
    15  09:14  Regulus 1.7°S of Moon
    15  20:31  Venus 1.6°S of Moon
    19  12:52  FIRST QUARTER MOON 
    20  03     Mercury at Aphelion 
    20  16:57  Jupiter 4.4°S of Moon
    24  09:49  Mercury 1.2°S of Regulus
    24  23:10  Saturn 2.0°S of Moon
    26  23     Mars at Opposition 
    26  22:44  Moon at Apogee: 406223 km
    27  13:20  FULL MOON 
    27  13:22  Total Lunar Eclipse; mag=1.609
    27  15:40  Moon at Descending Node 
    28  02     Delta-Aquarid Meteor Shower

Aug 04  11:18  LAST QUARTER MOON 
    06  11:35  Aldebaran 1.1°S of Moon
    08  19     Mercury at Inferior Conjunction 
    10  06:40  Moon at Ascending Node 
    10  11:05  Moon at Perigee: 358083 km
    11  02:46  Partial Solar Eclipse; mag=0.737
    11  02:58  NEW MOON 
    12  18     Perseid Meteor Shower
    14  06:35  Venus 6.3°S of Moon
    17  03:38  Jupiter 4.5°S of Moon
    17  09     Venus at Greatest Elong: 45.9°E
    18  00:49  FIRST QUARTER MOON 
    20  19:09  Mercury 4.8°S of Beehive
    21  02:55  Saturn 2.1°S of Moon
    23  04:23  Moon at Apogee: 405744 km
    23  21:51  Moon at Descending Node 
    26  04:56  FULL MOON 
    26  13     Mercury at Greatest Elong: 18.3°W
    31  21:45  Venus 1.0°S of Spica

Sep 02  03     Mercury at Perihelion 
    02  18:34  Aldebaran 1.2°S of Moon
    02  19:37  LAST QUARTER MOON 
    06  15:42  Moon at Ascending Node 
    06  19:13  Beehive 1.4°N of Moon
    07  10     Neptune at Opposition 
    07  18:21  Moon at Perigee: 361355 km
    09  11:01  NEW MOON 
    13  19:21  Jupiter 4.4°S of Moon
    16  05     Mars at Perihelion 
    16  16:15  FIRST QUARTER MOON 
    17  09:46  Saturn 2.1°S of Moon
    19  17:54  Moon at Apogee: 404875 km
    19  23:38  Mars 4.8°S of Moon
    20  02:30  Moon at Descending Node 
    20  19     Mercury at Superior Conjunction 
    22  18:54  Autumnal Equinox 
    24  19:52  FULL MOON 
    30  00:06  Aldebaran 1.4°S of Moon

Oct 02  02:45  LAST QUARTER MOON 
    03  20:10  Moon at Ascending Node 
    04  02:51  Beehive 1.3°N of Moon
    05  14:58  Regulus 1.8°S of Moon
    05  15:29  Moon at Perigee: 366396 km
    08  20:47  NEW MOON 
    11  14:21  Jupiter 4.1°S of Moon
    14  20:01  Saturn 1.8°S of Moon
    15  20     Mercury 6.2° of Venus
    16  11:02  FIRST QUARTER MOON 
    17  05:03  Moon at Descending Node 
    17  12:16  Moon at Apogee: 404227 km
    18  06:01  Mars 1.9°S of Moon
    21  10     Orionid Meteor Shower
    23  18     Uranus at Opposition 
    24  09:45  FULL MOON 
    26  07     Venus at Inferior Conjunction 
    27  06:04  Aldebaran 1.6°S of Moon
    28  23     Mercury 3.1° of Jupiter
    30  20:46  Moon at Ascending Node 
    31  08:24  Beehive 1.0°N of Moon
    31  09:40  LAST QUARTER MOON 
    31  13:05  Moon at Perigee: 370201 km

Nov 01  21:16  Regulus 2.1°S of Moon
    05  11     S Taurid Meteor Shower
    06  08     Mercury at Greatest Elong: 23.3°E
    07  09:02  NEW MOON 
    08  21:58  Mercury 1.8°N of Antares
    11  08:46  Saturn 1.4°S of Moon
    12  10     N Taurid Meteor Shower
    13  07:04  Moon at Descending Node 
    14  08:57  Moon at Apogee: 404341 km
    14  16:14  Venus 0.2°S of Spica
    15  07:54  FIRST QUARTER MOON 
    15  21:16  Mars 1.0°N of Moon: Occn.
    17  16     Leonid Meteor Shower
    22  22:39  FULL MOON 
    23  14:11  Aldebaran 1.7°S of Moon
    25  23     Jupiter in Conjunction with Sun 
    26  05:10  Moon at Perigee: 366623 km
    26  22:18  Moon at Ascending Node 
    27  02     Mercury at Inferior Conjunction 
    27  13:57  Beehive 0.8°N of Moon
    29  02     Mercury at Perihelion 
    29  02:27  Regulus 2.3°S of Moon
    29  17:19  LAST QUARTER MOON 

Dec 03  11:42  Venus 3.6°S of Moon
    05  14:06  Mercury 1.9°S of Moon
    07  00:20  NEW MOON 
    08  22:30  Saturn 1.1°S of Moon: Occn.
    10  10:57  Moon at Descending Node 
    12  05:25  Moon at Apogee: 405177 km
    14  05     Geminid Meteor Shower
    14  16:21  Mars 3.6°N of Moon
    15  04     Mercury at Greatest Elong: 21.3°W
    15  04:49  FIRST QUARTER MOON 
    21  00:31  Aldebaran 1.7°S of Moon
    21  13     Mercury 0.8° of Jupiter
    21  15:22  Winter Solstice 
    22  01:05  Mercury 5.8°N of Antares
    22  08:03  Jupiter 5.1°N of Antares
    22  10:49  FULL MOON 
    22  14     Ursid Meteor Shower
    24  02:52  Moon at Perigee: 361060 km
    24  04:54  Moon at Ascending Node 
    24  21:52  Beehive 0.6°N of Moon
    26  09:06  Regulus 2.5°S of Moon
    26  11     Venus at Perihelion 
    29  02:34  LAST QUARTER 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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