Waning Gibbous on

Moon phase on 13 September 2011 Tuesday is Waning Gibbous, 15 days old Moon is in Aries.

Share this page: twitter facebook google+ linkedin

Moon phase for

Lunar calendar 2011 | September 2011

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

Waning Gibbous 99% illuminated

Waning Gibbous is the lunar phase on . Seen from Earth, illuminated fraction of the Moon surface is 99% and getting smaller. The 15 days old Moon is in ♈ Aries.

Previous date | Moon Today | Next date

Moon phases for next 7 days

7 days ago | 7 days after

Moon phase and lunation details

1 day after Full Moon

Previous main lunar phase is the Full Moon before 1 day on 12 September 2011 at 09:27.

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 ∠3° of ♈ Aries tropical zodiac sector.

Apparent angular diameter ∠1772"

Lunar disc appears visually 7.4% narrower than solar disc. Moon and Sun apparent angular diameters are ∠1772" and ∠1907".

Harvest Moon before 1 day

Next Full Moon is the Hunter Moon of October 2011 after 28 days on 12 October 2011 at 02:06.

Upcoming main Moon phases

Moderate tide

There is medium ocean tide on this date. Sun and Moon gravitational forces are not aligned, but meet at very acute angle, so their combined tidal force is moderate.

Lunation 144 / 1097

The Moon is 15 days old. Earth's natural satellite is moving from the middle to the last part of current synodic month. This is lunation 144 of Meeus index or 1097 from Brown series.

PreviousCurrent lunationNext

Synodic month length 29.34 days

Length of current 144 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 next lunation 145 length.

Lunation length shorter than mean

Length of current synodic month is 4 hours and 39 minutes shorter than the mean length of synodic month, but it is still 1 hour and 30 minutes longer, compared to 21st century shortest.

Lunar orbit position on

True anomaly ∠333.4°

This lunation true anomaly is ∠333.4°. At the beginning of next synodic month true anomaly will be ∠350.1°. The length of upcoming synodic months will keep decreasing since the true anomaly gets closer to the value of New Moon at point of perigee (∠0° or ∠360°).

Moon before apogee

13 days after point of perigee on 30 August 2011 at 17:35 in ♍ Virgo. The lunar orbit is getting wider, while the Moon is moving outward the Earth. It will keep this direction for the next day, until it get to the point of next apogee on 15 September 2011 at 06:23 in ♈ Aries.

Previous perigeeNext apogee

Distance to Moon 404 524 km

Moon is 404 524 km (251 360 mi) away from Earth on this date. Moon moves farther next day until apogee, when Earth-Moon distance will reach 406 068 km (252 319 mi).

Moon before descending node

8 days after its ascending node on 5 September 2011 at 07:36 in ♐ Sagittarius, the Moon is following the northern part of its orbit for the next 6 days, until it will cross the ecliptic from North to South in descending node on 19 September 2011 at 19:38 in ♊ Gemini.

Previous nodeNext node

Draconic month

8 days after beginning of current draconic month in ♐ Sagittarius, the Moon is moving from the beginning to the first part of it.

PreviousCurrent draconic monthNext

Moon before northern standstill

8 days after previous South standstill on 5 September 2011 at 05:01 in ♐ Sagittarius, when Moon has reached southern declination of ∠-23.047°. Next 6 days the lunar orbit moves northward to face North declination of ∠22.890° in the next northern standstill on 19 September 2011 at 20:05 in ♊ Gemini.

Previous standstillNext standstill

Syzygy in 13 days

After 13 days on 27 September 2011 at 11:09 in ♎ Libra, the Moon will be in New Moon geocentric conjunction with the Sun and this alignment forms next Sun-Moon-Earth syzygy.

Previous syzygyNext syzygy

Share this page: twitter facebook google+ linkedin
Back to: Top of page