Waning Gibbous on

Moon phase on 23 September 2021 Thursday is Waning Gibbous, 17 days old Moon is in Aries.

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Moon phase for

Lunar calendar 2021 | September 2021

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

Waning Gibbous 94% illuminated

Waning Gibbous is the lunar phase on . Seen from Earth, illuminated fraction of the Moon surface is 94% and getting smaller. The 17 days old Moon is in ♈ Aries.

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Moon phases for next 7 days

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Moon phase and lunation details

2 days after Full Moon

Previous main lunar phase is the Full Moon before 2 days on 20 September 2021 at 23:55.

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.

Moon is entering ♈ Aries

Moon is passing first ∠0° of ♈ Aries tropical zodiac sector.

Apparent angular diameter ∠1789"

Lunar disc appears visually 6.7% narrower than solar disc. Moon and Sun apparent angular diameters are ∠1789" and ∠1913".

Harvest Moon before 2 days

Next Full Moon is the Hunter Moon of October 2021 after 27 days on 20 October 2021 at 14:57.

Upcoming main Moon phases

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 268 / 1221

The 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 268 of Meeus index or 1221 from Brown series.

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Synodic month length 29.43 days

The length of the lunation is 29 days, 10 hours and 14 minutes. It is 5 minutes longer than the next lunation's length. The lengths of the following synodic months are going to decreasing with the true anomaly getting closer to the value it has at the point of New Moon at perigee (∠0° or ∠360°).

Lunation length shorter than mean

The length of the current synodic month is 2 hours and 30 minutes shorter than the mean synodic month length. It is 3 hours and 39 minutes longer compared to 21st century's shortest synodic month length.

Lunar orbit position on

True anomaly ∠297.8°

At the beginning of the lunation cycle the true anomaly is ∠297.8°. At the beginning of next synodic month the true anomaly is going to be ∠323.3°.

Moon before perigee

12 days after point of perigee on 11 September 2021 at 10:05 in ♏ Scorpio. The lunar orbit is getting widen, while the Moon is moving away from the Earth. It will keep this direction over the next 3 days, until the Moon reaches the point of next apogee on 26 September 2021 at 21:44 in ♊ Gemini.

Previous perigeeNext apogee

Distance to Moon 400 626 km

The Moon is 400 626 km (248 937 mi) away from Earth and getting further over the next 3 days until the point apogee when Earth-Moon distance is going to be 404 641 km (251 432 mi).

Moon before ascending node

10 days after descending node on 12 September 2021 at 16:35 in ♏ Scorpio. The Moon is located south of the ecliptic over the following 2 days, until the lunar orbit crosses from South to North in ascending node on 26 September 2021 at 07:33 in ♊ Gemini.

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Draconic month

24 days since the beginning of current draconic month in ♊ Gemini, the Moon is navigating from the second to the final part of the cycle.

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Moon before northern standstill

8 days since the previous standstill on 15 September 2021 at 03:48 in ♑ Capricorn when the Moon has reached South declination of ∠-25.980°, the lunar orbit is extending northward over the next 5 days to face maximum declination of ∠26.109° at the point of next northern standstill on 29 September 2021 at 08:26 in ♋ Cancer.

Previous standstillNext standstill

Syzygy in 12 days

In 12 days on 6 October 2021 at 11:05 in ♎ Libra the Moon is going to be in a New Moon geocentric conjunction with the Sun and thus forming the next Sun-Moon-Earth syzygy alignment.

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