Waning Gibbous on

Moon phase on 20 September 2013 Friday is Waning Gibbous, 16 days old Moon is in Aries.

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Moon phase for

Lunar calendar 2013 | September 2013

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

Waning Gibbous 99% illuminated

Waning Gibbous is the lunar phase on . Seen from Earth, illuminated fraction of the Moon surface is 99% and getting smaller. The Moon is in ♈ Aries.

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Moon phases for next 7 days

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Moon phase and lunation details

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.

1 day after Full Moon

Previous main lunar phase is the Full Moon before 1 day on 19 September 2013 at 11:13.

Moon in ♈ Aries

Moon is passing about ∠11° of ♈ Aries tropical zodiac sector.

Upcoming main Moon phases

Harvest Moon before 1 day

Next Full Moon is the Hunter Moon of October after 28 days on 18 October 2013 at 23:38.

Apparent angular diameter ∠1872"

Lunar disc appears visually 2.08% narrower than solar disc. Moon and Sun apparent angular diameters are ∠1872" and ∠1911".

Moderate tide

There is medium ocean tide on this date. Sun and Moon gravitational forces are not aligned, but meet at very acute angle, so their combined tidal force is moderate.

Lunation 169 / 1122

Moon is 16 days old. Earth's natural satellite is moving from the middle to the last part of current synodic month. This is lunation 169 of Meeus index or 1122 from Brown series.

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Synodic month length 29.54 days

Length of current 169 lunation is 29 days, 12 hours and 58 minutes. It is 43 minutes longer than next lunation 170.

Lunation length longer than mean

Length of current synodic month is 14 minutes longer than the mean length of synodic month, but it is still 6 hours and 49 minutes shorter, compared to 21st century longest.

Lunar orbit position on

True anomaly ∠249.2°

This lunation true anomaly is ∠249.2°. At the beginning of next synodic month true anomaly is ∠285.3°. 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 perigee

4 days after point of perigee on 15 September 2013 at 16:34, lunar orbit gets wider while the Moon moves outward the Earth. It keeps this direction for next 7 days until it gets to the point of apogee on 27 September 2013 at 18:17.

Distance to Moon 382 962 km

Moon is 382 962 km (237 962 mi) away from Earth on this date. At previous perigee point before 4 days, distance is 367 388 km (228 284 mi). Moon moves farther next 7 days until apogee, when Earth-Moon distance reaches 404 309 km (251 226 mi).

Moon before descending node

10 days after its ascending node on 9 September 2013 at 17:29, the Moon follows the northern part of its orbit for the next 2 days untill it crosses the ecliptic from North to South in descending node on 22 September 2013 at 13:48.

Draconic month

10 days after its beginning, the Moon is moving from the beginning to the first part of current draconic month.

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Moon before northern standstill

7 days after previous South standstill on 12 September 2013 at 18:30, when Moon reaches southern declination of ∠-19.685°, lunar orbit moves northward for the next 5 days to face North declination of ∠19.599° in the next northern standstill on 26 September 2013 at 01:03.

Syzygy in 14 days

After 14 days the Moon is in New Moon conjunction with the Sun and this alignment forms next Sun-Moon-Earth syzygy on 5 October 2013 at 00:35.

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