First Quarter Moon
First Quarter MoonImage credit: NASA/Goddard Space Flight Center Scientific Visualization Studio.(large image)

First Quarter in Sagittarius

First Quarter on . Illuminated surface of the Moon is 58% and growing larger. Lunar cycle is 8 days young.

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

Moonrise and moonset

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

Upcoming main moon phases

Main moon phases of the following lunar cycle.

Moon phase and lunation details

Moon is entering ♐ Sagittarius

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

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.

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.

Apparent angular diameter ∠1874"

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

Lunation 131 / 1084

The Moon is 8 days young and navigating through the first part of the current synodic month. This is lunation 131 of Meeus index or 1084 from Brown series.

Synodic month length 29.31 days

The length of this lunation is 29 days, 7 hours and 22 minutes and it is 53 minutes shorter than the upcoming lunation's length. This is the year's shortest synodic month of 2010. The lengths of the following synodic months are going to increase with the lunar orbit 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 details for

True anomaly ∠349.5°

The true anomaly of the Moon orbit at the beginning of this lunation cycle is ∠349.5° and at the beginning of the next lunar synodic month the true anomaly is going to be ∠4.6°.

Moon after perigee

6 days since 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.

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 positioned south of the ecliptic over the following 3 days until the lunar crosses the ecliptic again from South to North in ascending node on 20 August 2010 at 12:13 in ♑ Capricorn.

Moon before southern standstill

11 days since the last northern 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.

Draconic month

24 days since the beginning of this draconic month in ♑ Capricorn the Moon is navigating from the second to the final part of the lunar cycle.

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.

Lunar calendar

Sources and credits

Parts of this Lunar Calendar are based on Planetary Ephemeris Data Courtesy of Fred Espenak, www.Astropixels.com

Moon phase image credit to NASA/Goddard Space Flight Center Scientific Visualization Studio, svs.gsfc.nasa.gov