First Quarter on

Moon phase on 4 September 2011 Sunday is First Quarter, 7 days young Moon is in Sagittarius.

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Moon phase for

Lunar calendar 2011 | September 2011

First Quarter phase
First Quarter phase
Image credit: NASA/Goddard Space Flight Center Scientific Visualization Studio.

First Quarter 47% illuminated

First Quarter is the lunar phase on . Seen from Earth, illuminated fraction of the Moon surface is 47% and growing larger. The 7 days young Moon is in ♐ Sagittarius.

* The exact date and time of this First Quarter phase is on 4 September 2011 at 17:39 UTC.

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Moon phases for next 7 days

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Moon phase and lunation details

Moonrise and moonset

Moon rises at noon and sets at midnight. It is visible high in the southern sky in early evening.

Moon in ♐ Sagittarius

Moon is passing about ∠9° of ♐ Sagittarius tropical zodiac sector.

Apparent angular diameter ∠1936"

Lunar disc appears visually 1.7% wider than solar disc. Moon and Sun apparent angular diameters are ∠1936" and ∠1903".

Harvest Moon after 7 days

Next Full Moon is the Harvest Moon of September 2011 after 7 days on 12 September 2011 at 09:27.

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 144 / 1097

The Moon is 7 days young. Earth's natural satellite is moving through the first part of current synodic month. This is lunation 144 of Meeus index or 1097 from Brown series.

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Synodic month length 29.34 days

The length of the lunation is 29 days, 8 hours and 5 minutes. This is the year's shortest synodic month of 2011. It is 42 minutes shorter 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 4 hours and 39 minutes shorter than the mean synodic month length. It is 1 hour and 30 minutes longer compared to 21st century's shortest synodic month length.

Lunar orbit position on

True anomaly ∠333.4°

At the beginning of the lunation cycle the true anomaly is ∠333.4°. At the beginning of next synodic month the true anomaly is going to be ∠350.1°.

Moon after perigee

4 days after point of perigee on 30 August 2011 at 17:35 in ♍ Virgo. The lunar orbit is getting widen, while the Moon is moving away from the Earth. It will keep this direction over the next 10 days, until the Moon reaches the point of next apogee on 15 September 2011 at 06:23 in ♈ Aries.

Previous perigeeNext apogee

Distance to Moon 370 232 km

The Moon is 370 232 km (230 051 mi) away from Earth and getting further over the next 10 days until the point apogee when Earth-Moon distance is going to be 406 068 km (252 319 mi).

Moon before ascending node

11 days after descending node on 23 August 2011 at 17:23 in ♊ Gemini. The Moon is located south of the ecliptic over the following day, until the lunar orbit crosses from South to North in ascending node on 5 September 2011 at 07:36 in ♐ Sagittarius.

Previous nodeNext node

Draconic month

26 days since the beginning of current draconic month in ♐ Sagittarius, the Moon is navigating from the second to the final part of the cycle.

PreviousCurrent draconic monthNext

Moon before southern standstill

11 days since the previous standstill on 23 August 2011 at 12:17 in ♊ Gemini when the Moon has reached North declination of ∠23.149°, the lunar orbit is extending southward over the next day to face maximum declination of ∠-23.047° at the point of next southern standstill on 5 September 2011 at 05:01 in ♐ Sagittarius.

Previous standstillNext standstill

Syzygy in 7 days

In 7 days on 12 September 2011 at 09:27 in ♓ Pisces the Moon is going to be in a Full Moon geocentric opposition with the Sun and thus forming the next Sun-Earth-Moon syzygy alignment.

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