Waning Gibbous on

Moon phase on 18 August 2011 Thursday is Waning Gibbous, 19 days old Moon is in Aries.

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Moon phase for

Lunar calendar 2011 | August 2011

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

Waning Gibbous 80% illuminated

Waning Gibbous is the lunar phase on . Seen from Earth, illuminated fraction of the Moon surface is 80% and getting smaller. The 19 days old Moon is in ♈ Aries.

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Moon phases for next 7 days

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Moon phase and lunation details

4 days after Full Moon

Previous main lunar phase is the Full Moon before 4 days on 13 August 2011 at 18:58.

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 in ♈ Aries

Moon is passing about ∠18° of ♈ Aries tropical zodiac sector.

Apparent angular diameter ∠1768"

Lunar disc appears visually 7% narrower than solar disc. Moon and Sun apparent angular diameters are ∠1768" and ∠1896".

Sturgeon Moon before 4 days

Next Full Moon is the Harvest Moon of September 2011 after 24 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 143 / 1096

The Moon is 19 days old. Earth's natural satellite is moving from the middle to the last part of current synodic month. This is lunation 143 of Meeus index or 1096 from Brown series.

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Synodic month length 29.35 days

Length of current 143 lunation is 29 days, 8 hours and 24 minutes. It is 19 minutes longer than next lunation 144 length.

Lunation length shorter than mean

Length of current synodic month is 4 hours and 20 minutes shorter than the mean length of synodic month, but it is still 1 hour and 49 minutes longer, compared to 21st century shortest.

Lunar orbit position on

True anomaly ∠312.1°

This lunation true anomaly is ∠312.1°. At the beginning of next synodic month true anomaly will be ∠333.4°. 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 in apogee

Moon is reaching point of apogee on this date at 16:23, this is 15 days after last perigee on 2 August 2011 at 20:59 in ♍ Virgo. Lunar orbit is starting to get closer, while the Moon is moving inward the Earth for 12 days ahead, until it will get to the point of next perigee on 30 August 2011 at 17:35 in ♍ Virgo.

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Distance to Moon 405 161 km

This apogee Moon is 405 161 km (251 755 mi) away from Earth. It is 247 km farther than the mean apogee distance, but it is still 1 548 km closer than the farthest apogee of 21st century.

Moon before descending node

9 days after its ascending node on 9 August 2011 at 06:35 in ♐ Sagittarius, the Moon is following the northern part of its orbit for the next 5 days, until it will cross the ecliptic from North to South in descending node on 23 August 2011 at 17:23 in ♊ Gemini.

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Draconic month

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

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Moon before northern standstill

9 days after previous South standstill on 8 August 2011 at 23:15 in ♐ Sagittarius, when Moon has reached southern declination of ∠-23.270°. Next 5 days the lunar orbit moves northward to face North declination of ∠23.149° in the next northern standstill on 23 August 2011 at 12:17 in ♊ Gemini.

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Syzygy in 10 days

After 10 days on 29 August 2011 at 03:04 in ♍ Virgo, the Moon will be in New Moon geocentric conjunction with the Sun and this alignment forms next Sun-Moon-Earth syzygy.

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