2018 Calendar of Astronomical Events



2018 Phases of the Moon

Pacific 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
Pacific Standard Time
New Moon First Quarter Full Moon Last Quarter
-- Jan 1 18:24 Jan 8 14:25
Jan 16 18:17 Jan 24 14:20 Jan 31 05:27 t Feb 7 07:54
Feb 15 13:05 P Feb 23 00:09 Mar 1 16:51 Mar 9 03:20
Mar 17 05:12 Mar 24 07:35 Mar 31 04:37 Apr 7 23:18
Apr 15 17:57 Apr 22 13:46 Apr 29 16:58 May 7 18:09
May 15 03:48 May 21 19:49 May 29 06:20 Jun 6 10:32
Jun 13 11:43 Jun 20 02:51 Jun 27 20:53 Jul 5 23:51
Jul 12 18:48 P Jul 19 11:52 Jul 27 12:20 t Aug 4 10:18
Aug 11 01:58 P Aug 17 23:49 Aug 26 03:56 Sep 2 18:37
Sep 9 10:01 Sep 16 15:15 Sep 24 18:53 Oct 2 01:45
Oct 8 19:47 Oct 16 10:02 Oct 24 08:45 Oct 31 08:40
Nov 7 08:02 Nov 15 06:54 Nov 22 21:39 Nov 29 16:19
Dec 6 23:20 Dec 15 03:49 Dec 22 09:49 Dec 29 01:34

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

Pacific 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     PST   Event
        (h:m)

Jan 01  12     Mercury at Greatest Elong: 22.7°W
    01  13:54  Moon at Perigee: 356566 km
    01  18:24  FULL MOON 
    02  22     Earth at Perihelion: 0.98329 AU
    03  11:50  Beehive 2.3°N of Moon
    03  12     Quadrantid Meteor Shower
    03  23:48  Moon at Ascending Node 
    04  23:24  Regulus 0.9°S of Moon
    08  14:25  LAST QUARTER MOON 
    08  22     Venus at Superior Conjunction 
    10  21:59  Jupiter 4.3°S of Moon
    11  02:03  Mars 4.6°S of Moon
    13  00     Mercury 0.7° of Saturn
    14  18:10  Moon at Apogee: 406461 km
    14  18:13  Saturn 2.6°S of Moon
    14  23:24  Mercury 3.4°S of Moon
    16  18:17  NEW MOON 
    18  06:28  Moon at Descending Node 
    23  09     Venus at Aphelion 
    24  14:20  FIRST QUARTER MOON 
    25  03     Mercury at Aphelion 
    27  02:09  Aldebaran 0.7°S of Moon
    30  01:54  Moon at Perigee: 358995 km
    30  23:19  Beehive 2.3°N of Moon
    31  05:27  FULL MOON 
    31  05:30  Total Lunar Eclipse; mag=1.315
    31  10:46  Moon at Ascending Node 

Feb 01  10:24  Regulus 0.9°S of Moon
    07  07:54  LAST QUARTER MOON 
    07  11:47  Jupiter 4.3°S of Moon
    08  21:12  Mars 4.4°S of Moon
    11  06:16  Moon at Apogee: 405701 km
    11  06:46  Saturn 2.5°S of Moon
    11  08:40  Mars 5.0°N of Antares
    14  13:11  Moon at Descending Node 
    15  12:51  Partial Solar Eclipse; mag=0.599
    15  13:05  NEW MOON 
    17  04     Mercury at Superior Conjunction 
    23  00:09  FIRST QUARTER MOON 
    23  09:07  Aldebaran 0.7°S of Moon
    27  06:48  Moon at Perigee: 363938 km
    27  09:28  Beehive 2.3°N of Moon
    27  21:03  Moon at Ascending Node 
    28  21:09  Regulus 0.9°S of Moon

Mar 01  16:51  FULL MOON 
    03  22     Mercury 1.1° of Venus
    04  06     Neptune in Conjunction with Sun 
    06  22:57  Jupiter 4.1°S of Moon
    09  03:20  LAST QUARTER MOON 
    09  16:37  Mars 3.8°S of Moon
    10  03     Mercury at Perihelion 
    10  18:37  Saturn 2.2°S of Moon
    11  01:13  Moon at Apogee: 404682 km
    13  19:47  Moon at Descending Node 
    15  07     Mercury at Greatest Elong: 18.4°E
    17  05:12  NEW MOON 
    18  11:07  Venus 3.7°N of Moon
    19  00     Mercury 3.8° of Venus
    20  08:15  Vernal Equinox 
    22  14:33  Aldebaran 0.9°S of Moon
    24  07:35  FIRST QUARTER MOON 
    26  09:17  Moon at Perigee: 369104 km
    26  16:52  Beehive 2.2°N of Moon
    27  02:56  Moon at Ascending Node 
    28  05:38  Regulus 1.0°S of Moon
    31  04:37  FULL MOON 

Apr 01  10     Mercury at Inferior Conjunction 
    03  06:14  Jupiter 3.9°S of Moon
    03  09     Saturn at Aphelion 
    07  04:50  Saturn 1.9°S of Moon
    07  10:15  Mars 3.1°S of Moon
    07  21:32  Moon at Apogee: 404145 km
    07  23:18  LAST QUARTER MOON 
    10  00:09  Moon at Descending Node 
    14  01:24  Mercury 3.9°N of Moon
    15  17:57  NEW MOON 
    17  11:29  Venus 5.4°N of Moon
    18  07     Uranus in Conjunction with Sun 
    18  20:45  Aldebaran 1.1°S of Moon
    20  06:44  Moon at Perigee: 368713 km
    22  10     Lyrid Meteor Shower
    22  13:46  FIRST QUARTER MOON 
    22  22:17  Beehive 1.9°N of Moon
    23  04:19  Moon at Ascending Node 
    24  08:47  Venus 3.4°S of Pleiades
    24  11:39  Regulus 1.2°S of Moon
    29  10     Mercury at Greatest Elong: 27.0°W
    29  16:58  FULL MOON 
    30  09:16  Jupiter 3.8°S of Moon

May 02  05:29  Venus 6.3°N of Aldebaran
    04  12:31  Saturn 1.7°S of Moon
    04  23     Eta-Aquarid Meteor Shower
    05  16:35  Moon at Apogee: 404458 km
    05  23:24  Mars 2.7°S of Moon
    07  02:23  Moon at Descending Node 
    07  18:09  LAST QUARTER MOON 
    08  16     Jupiter at Opposition 
    13  09:21  Mercury 2.4°N of Moon
    15  03:48  NEW MOON 
    15  17     Venus at Perihelion 
    17  10:11  Venus 4.8°N of Moon
    17  13:06  Moon at Perigee: 363777 km
    20  03:57  Beehive 1.7°N of Moon
    20  05:13  Moon at Ascending Node 
    21  16:53  Regulus 1.4°S of Moon
    21  19:49  FIRST QUARTER MOON 
    27  09:39  Jupiter 4.0°S of Moon
    29  06:20  FULL MOON 
    31  17:20  Saturn 1.6°S of Moon

Jun 02  08:34  Moon at Apogee: 405316 km
    03  03:58  Mars 3.2°S of Moon
    03  04:39  Moon at Descending Node 
    05  18     Mercury at Superior Conjunction 
    06  02     Mercury at Perihelion 
    06  10:32  LAST QUARTER MOON 
    07  19:37  Venus 4.6°S of Pollux
    13  11:43  NEW MOON 
    14  15:55  Moon at Perigee: 359507 km
    16  05:13  Venus 2.3°N of Moon
    16  09:50  Moon at Ascending Node 
    16  11:38  Beehive 1.5°N of Moon
    17  23:25  Regulus 1.7°S of Moon
    19  18:21  Venus 0.4°N of Beehive
    20  02:51  FIRST QUARTER MOON 
    21  02:07  Summer Solstice 
    23  10:47  Jupiter 4.2°S of Moon
    24  13:37  Mercury 4.7°S of Pollux
    27  04     Saturn at Opposition 
    27  19:59  Saturn 1.8°S of Moon
    27  20:53  FULL MOON 
    29  18:43  Moon at Apogee: 406061 km
    30  08:44  Moon at Descending Node 
    30  17:43  Mars 4.8°S of Moon

Date     PST   Event
        (h:m)

Jul 03  21:39  Mercury 0.6°S of Beehive
    05  23:51  LAST QUARTER MOON 
    06  09     Earth at Aphelion: 1.01670 AU
    09  15:34  Venus 0.9°N of Regulus
    10  01:30  Aldebaran 1.1°S of Moon
    11  21     Mercury at Greatest Elong: 26.4°E
    12  18:48  NEW MOON 
    12  19:01  Partial Solar Eclipse; mag=0.337
    13  00:28  Moon at Perigee: 357432 km
    13  18:50  Moon at Ascending Node 
    14  14:04  Mercury 2.2°S of Moon
    15  08:14  Regulus 1.7°S of Moon
    15  19:31  Venus 1.6°S of Moon
    19  11:52  FIRST QUARTER MOON 
    20  02     Mercury at Aphelion 
    20  15:57  Jupiter 4.4°S of Moon
    24  08:49  Mercury 1.2°S of Regulus
    24  22:10  Saturn 2.0°S of Moon
    26  22     Mars at Opposition 
    26  21:44  Moon at Apogee: 406223 km
    27  12:20  FULL MOON 
    27  12:22  Total Lunar Eclipse; mag=1.609
    27  14:40  Moon at Descending Node 
    28  01     Delta-Aquarid Meteor Shower

Aug 04  10:18  LAST QUARTER MOON 
    06  10:35  Aldebaran 1.1°S of Moon
    08  18     Mercury at Inferior Conjunction 
    10  05:40  Moon at Ascending Node 
    10  10:05  Moon at Perigee: 358083 km
    11  01:46  Partial Solar Eclipse; mag=0.737
    11  01:58  NEW MOON 
    12  17     Perseid Meteor Shower
    14  05:35  Venus 6.3°S of Moon
    17  02:38  Jupiter 4.5°S of Moon
    17  08     Venus at Greatest Elong: 45.9°E
    17  23:49  FIRST QUARTER MOON 
    20  18:09  Mercury 4.8°S of Beehive
    21  01:55  Saturn 2.1°S of Moon
    23  03:23  Moon at Apogee: 405744 km
    23  20:51  Moon at Descending Node 
    26  03:56  FULL MOON 
    26  12     Mercury at Greatest Elong: 18.3°W
    31  20:45  Venus 1.0°S of Spica

Sep 02  02     Mercury at Perihelion 
    02  17:34  Aldebaran 1.2°S of Moon
    02  18:37  LAST QUARTER MOON 
    06  14:42  Moon at Ascending Node 
    06  18:13  Beehive 1.4°N of Moon
    07  09     Neptune at Opposition 
    07  17:21  Moon at Perigee: 361355 km
    09  10:01  NEW MOON 
    13  18:21  Jupiter 4.4°S of Moon
    16  04     Mars at Perihelion 
    16  15:15  FIRST QUARTER MOON 
    17  08:46  Saturn 2.1°S of Moon
    19  16:54  Moon at Apogee: 404875 km
    19  22:38  Mars 4.8°S of Moon
    20  01:30  Moon at Descending Node 
    20  18     Mercury at Superior Conjunction 
    22  17:54  Autumnal Equinox 
    24  18:52  FULL MOON 
    29  23:06  Aldebaran 1.4°S of Moon

Oct 02  01:45  LAST QUARTER MOON 
    03  19:10  Moon at Ascending Node 
    04  01:51  Beehive 1.3°N of Moon
    05  13:58  Regulus 1.8°S of Moon
    05  14:29  Moon at Perigee: 366396 km
    08  19:47  NEW MOON 
    11  13:21  Jupiter 4.1°S of Moon
    14  19:01  Saturn 1.8°S of Moon
    15  19     Mercury 6.2° of Venus
    16  10:02  FIRST QUARTER MOON 
    17  04:03  Moon at Descending Node 
    17  11:16  Moon at Apogee: 404227 km
    18  05:01  Mars 1.9°S of Moon
    21  09     Orionid Meteor Shower
    23  17     Uranus at Opposition 
    24  08:45  FULL MOON 
    26  06     Venus at Inferior Conjunction 
    27  05:04  Aldebaran 1.6°S of Moon
    28  22     Mercury 3.1° of Jupiter
    30  19:46  Moon at Ascending Node 
    31  07:24  Beehive 1.0°N of Moon
    31  08:40  LAST QUARTER MOON 
    31  12:05  Moon at Perigee: 370201 km

Nov 01  20:16  Regulus 2.1°S of Moon
    05  10     S Taurid Meteor Shower
    06  07     Mercury at Greatest Elong: 23.3°E
    07  08:02  NEW MOON 
    08  20:58  Mercury 1.8°N of Antares
    11  07:46  Saturn 1.4°S of Moon
    12  09     N Taurid Meteor Shower
    13  06:04  Moon at Descending Node 
    14  07:57  Moon at Apogee: 404341 km
    14  15:14  Venus 0.2°S of Spica
    15  06:54  FIRST QUARTER MOON 
    15  20:16  Mars 1.0°N of Moon: Occn.
    17  15     Leonid Meteor Shower
    22  21:39  FULL MOON 
    23  13:11  Aldebaran 1.7°S of Moon
    25  22     Jupiter in Conjunction with Sun 
    26  04:10  Moon at Perigee: 366623 km
    26  21:18  Moon at Ascending Node 
    27  01     Mercury at Inferior Conjunction 
    27  12:57  Beehive 0.8°N of Moon
    29  01     Mercury at Perihelion 
    29  01:27  Regulus 2.3°S of Moon
    29  16:19  LAST QUARTER MOON 

Dec 03  10:42  Venus 3.6°S of Moon
    05  13:06  Mercury 1.9°S of Moon
    06  23:20  NEW MOON 
    08  21:30  Saturn 1.1°S of Moon: Occn.
    10  09:57  Moon at Descending Node 
    12  04:25  Moon at Apogee: 405177 km
    14  04     Geminid Meteor Shower
    14  15:21  Mars 3.6°N of Moon
    15  03     Mercury at Greatest Elong: 21.3°W
    15  03:49  FIRST QUARTER MOON 
    20  23:31  Aldebaran 1.7°S of Moon
    21  12     Mercury 0.8° of Jupiter
    21  14:22  Winter Solstice 
    22  00:05  Mercury 5.8°N of Antares
    22  07:03  Jupiter 5.1°N of Antares
    22  09:49  FULL MOON 
    22  13     Ursid Meteor Shower
    24  01:52  Moon at Perigee: 361060 km
    24  03:54  Moon at Ascending Node 
    24  20:52  Beehive 0.6°N of Moon
    26  08:06  Regulus 2.5°S of Moon
    26  10     Venus at Perihelion 
    29  01:34  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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