First Quarter on

Moon phase on 17 August 2010 Tuesday is First Quarter, 8 days young Moon is in Sagittarius.

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Moon phase for

Lunar calendar 2010 | August 2010

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

First Quarter 58% illuminated

First Quarter is the lunar phase on . Seen from Earth, illuminated fraction of the Moon surface is 58% and growing larger. The 8 days young Moon is in ♐ Sagittarius.

* The exact date and time of this First Quarter phase is on 16 August 2010 at 18:14 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 is entering ♐ Sagittarius

Moon is passing first ∠4° of ♐ Sagittarius tropical zodiac sector.

Apparent angular diameter ∠1874"

Lunar disc appears visually 1.1% narrower than solar disc. Moon and Sun apparent angular diameters are ∠1874" and ∠1895".

Sturgeon Moon after 7 days

Next Full Moon is the Sturgeon Moon of August 2010 after 7 days on 24 August 2010 at 17:05.

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 131 / 1084

The Moon is 8 days young. Earth's natural satellite is moving through the first part of current synodic month. This is lunation 131 of Meeus index or 1084 from Brown series.

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Synodic month length 29.31 days

The length of the lunation is 29 days, 7 hours and 22 minutes. This is the year's shortest synodic month of 2010. It is 53 minutes shorter than the next lunation's length. The lengths of the following synodic months are going to increasing with the true anomaly getting closer to the value it has at the point of New Moon at apogee (∠180°).

Lunation length shorter than mean

The length of the current synodic month is 5 hours and 22 minutes shorter than the mean synodic month length. It is 47 minutes longer compared to 21st century's shortest synodic month length.

Lunar orbit position on

True anomaly ∠349.5°

At the beginning of the lunation cycle the true anomaly is ∠349.5°. At the beginning of next synodic month the true anomaly is going to be ∠4.6°.

Moon after perigee

6 days after point of perigee on 10 August 2010 at 17:56 in ♌ Leo. The lunar orbit is getting widen, while the Moon is moving away from the Earth. It will keep this direction over the next 7 days, until the Moon reaches the point of next apogee on 25 August 2010 at 05:51 in ♓ Pisces.

Previous perigeeNext apogee

Distance to Moon 382 525 km

The Moon is 382 525 km (237 690 mi) away from Earth and getting further over the next 7 days until the point apogee when Earth-Moon distance is going to be 406 390 km (252 519 mi).

Moon before ascending node

9 days after descending node on 7 August 2010 at 17:24 in ♋ Cancer. The Moon is located south of the ecliptic over the following 3 days, until the lunar orbit crosses from South to North in ascending node on 20 August 2010 at 12:13 in ♑ Capricorn.

Previous nodeNext node

Draconic month

24 days since the beginning of current draconic month in ♑ Capricorn, 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 6 August 2010 at 02:49 in ♊ Gemini when the Moon has reached North declination of ∠24.984°, the lunar orbit is extending southward over the next day to face maximum declination of ∠-24.929° at the point of next southern standstill on 18 August 2010 at 17:07 in ♐ Sagittarius.

Previous standstillNext standstill

Syzygy in 7 days

In 7 days on 24 August 2010 at 17:05 in ♒ Aquarius 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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