Gibbous ♈ Aries
Moon phase on 21 December 2031 Sunday is First Quarter, 8 days young Moon is in Aries.Share this page: twitter facebook linkedin
First Quarter is the lunar phase on . Seen from Earth, illuminated fraction of the Moon surface is 55% and growing larger. The 8 days young Moon is in ♈ Aries.
* The exact date and time of this First Quarter phase is on 21 December 2031 at 00:00 UTC.
Moon rises at noon and sets at midnight. It is visible high in the southern sky in early evening.
Moon is passing about ∠6° of ♈ Aries tropical zodiac sector.
Lunar disc appears visually 1.6% narrower than solar disc. Moon and Sun apparent angular diameters are ∠1920" and ∠1951".
Next Full Moon is the Cold Moon of December 2031 after 7 days on 28 December 2031 at 17:33.
There is low ocean tide on this date. Sun and Moon gravitational forces are not aligned, but meet at big angle, so their combined tidal force is weak.
The Moon is 8 days young. Earth's natural satellite is moving through the first part of current synodic month. This is lunation 395 of Meeus index or 1348 from Brown series.
Length of current 395 lunation is 29 days, 11 hours and 1 minute. This is the year's shortest synodic month of 2031. It is 43 minutes longer than next lunation 396 length.
Length of current synodic month is 1 hour and 43 minutes shorter than the mean length of synodic month, but it is still 4 hours and 26 minutes longer, compared to 21st century shortest.
This lunation true anomaly is ∠334.7°. At the beginning of next synodic month true anomaly will be ∠351.6°. The length of upcoming synodic months will keep decreasing since the true anomaly gets closer to the value of New Moon at point of perigee (∠0° or ∠360°).
5 days after point of perigee on 15 December 2031 at 21:31 in ♑ Capricorn. The lunar orbit is getting wider, while the Moon is moving outward the Earth. It will keep this direction for the next 10 days, until it get to the point of next apogee on 31 December 2031 at 13:16 in ♌ Leo.
Moon is 373 388 km (232 013 mi) away from Earth on this date. Moon moves farther next 10 days until apogee, when Earth-Moon distance will reach 406 203 km (252 403 mi).
9 days after its ascending node on 12 December 2031 at 01:37 in ♏ Scorpio, the Moon is following the northern part of its orbit for the next 3 days, until it will cross the ecliptic from North to South in descending node on 24 December 2031 at 18:44 in ♉ Taurus.
9 days after beginning of current draconic month in ♏ Scorpio, the Moon is moving from the beginning to the first part of it.
7 days after previous South standstill on 14 December 2031 at 04:45 in ♐ Sagittarius, when Moon has reached southern declination of ∠-20.356°. Next 5 days the lunar orbit moves northward to face North declination of ∠20.355° in the next northern standstill on 27 December 2031 at 07:41 in ♊ Gemini.
After 7 days on 28 December 2031 at 17:33 in ♋ Cancer, the Moon will be in Full Moon geocentric opposition with the Sun and this alignment forms next Sun-Earth-Moon syzygy.