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 47% and growing larger. Lunar cycle is 7 days young.

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

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

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.

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 ∠1936"

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

Lunation 144 / 1097

The Moon is 7 days young and navigating through the first part of the current synodic month. This is lunation 144 of Meeus index or 1097 from Brown series.

Synodic month length 29.34 days

The length of this lunation is 29 days, 8 hours and 5 minutes and it is 42 minutes shorter than the upcoming lunation's length. This is the year's shortest synodic month of 2011. The lengths of the following synodic months are going to decrease with the lunar orbit 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 details for

True anomaly ∠333.4°

The true anomaly of the Moon orbit at the beginning of this lunation cycle is ∠333.4° and at the beginning of the next lunar synodic month the true anomaly is going to be ∠350.1°.

Moon after perigee

4 days since 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.

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 positioned south of the ecliptic over the following day until the lunar crosses the ecliptic again from South to North in ascending node on 5 September 2011 at 07:36 in ♐ Sagittarius.

Moon before southern standstill

11 days since the last northern 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.

Draconic month

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

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.

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