Waning Gibbous on

Moon phase on 20 December 2013 Friday is Waning Gibbous, 17 days old Moon is in Leo.

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Moon phase details for

Lunar calendar 2013 | December 2013

Waning Gibbous phase
Waning Gibbous phase
Image credit: NASA/Goddard Space Flight Center Scientific Visualization Studio.

Waning Gibbous 92% illuminated

Waning Gibbous is the lunar phase on . Seen from Earth, illuminated fraction of the Moon surface is 92% and getting smaller.

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Moon phase and lunation

Moonrise and moonset

Moon rises in the evening and sets in the morning. It is visible to the southwest and it is high in the sky after midnight.

3 days after Full Moon

Previous main lunar phase is the Full Moon before 3 days on 17 December 2013 at 09:28.

Cold Moon before 3 days

Next Full Moon is the Wolf Moon of January after 26 days on 16 January 2014 at 04:52.

Moon enters Leo

Moon is passing first ∠2° of Leo tropical zodiac sector.

Upcoming Moon phases

Apparent angular diameter ∠1769"

Lunar disc appears visually 9.74% narrower than solar disc. Moon and Sun apparent angular diameters are ∠1769" and ∠1950".

Neap tide

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.

Lunation 172 / 1125

Moon is 17 days old. Earth's natural satellite is moving from the middle to the last part of current synodic month. This is lunation 172 of Meeus index or 1125 from Brown series.

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Synodic month length 29.45 days

Length of current 172 lunation is 29 days, 10 hours and 52 minutes. It is 28 minutes longer than next lunation 173. This is the shortest synodic month of 2013.

Lunation length shorter than mean

Length of current synodic month is 1 hour and 52 minutes shorter than the mean length of synodic month, but it is still 4 hours and 17 minutes longer, compared to 21st century shortest.

Lunar orbit position on

True anomaly ∠336.4°

This lunation true anomaly is ∠336.4°. At the beginning of next synodic month true anomaly is ∠353°. The length of upcoming synodic months decreases since the true anomaly gets closer to the value of New Moon at point of perigee (∠0°or∠360°).

Moon after apogee

1 day after point of apogee on 19 December 2013 at 23:49, lunar orbit gets closer while the Moon moves inward the Earth. It keeps this direction for next 12 days until it gets to the point of perigee on 1 January 2014 at 21:00.

Distance to Moon 405 123 km

Moon is 405 123 km (251 732 mi) away from Earth on this date. At previous apogee point before 1 day, distance is 406 269 km (252 444 mi). Moon moves closer next 12 days until perigee, when Earth-Moon distance reaches 356 922 km (221 781 mi).

Moon after descending node

7 days after its descending node on 13 December 2013 at 10:10, the Moon follows the southern part of its orbit for the next 7 days untill it crosses the ecliptic from South to North in ascending node on 28 December 2013 at 00:21.

Draconic month

19 days after its beginning, the Moon is moving from the second to the final part of current draconic month.

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Moon after northern standstill

3 days after previous North standstill on 17 December 2013 at 01:00, when Moon reaches northern declination of ∠19.570°, lunar orbit moves southward for the next 10 days to face South declination of ∠-19.537° in the next southern standstill on 31 December 2013 at 04:49.

Syzygy in 11 days

After 11 days the Moon is in New Moon conjunction with the Sun and this alignment forms next Sun-Moon-Earth syzygy on 1 January 2014 at 11:14.

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