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Moon Phase on:

Waning Gibbous Phase

The Waning Gibbous Moon on September 21 has an illumination of 56%. This is the percentage of the Moon illuminated by the Sun. The illumination is constantly changing and can vary up to 10% a day. To see how the lunar illumination changes throughout September 21 visit this Moon Illumination Chart.

On September 21 the Moon is 21.54 days old. This refers to how many days it has been since the last New Moon. It takes 29.53 days for the Moon to orbit the Earth and go through the lunar cycle of all 8 Moon phases.

The 8 Lunar Phases

There are 8 lunar phases the Moon goes through in its 29.53 days lunar cycle. The 4 major Moon phases are New Moon, First Quarter, Full Moon and Last Quarter. Between these major phases, there are 4 minor ones: the Waxing Crescent, Waxing Gibbous, Waning Gibbous and Waning Crescent. For more info on the Moon Cycle and on each phase check out Wikipedia Lunar Phase page.


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Useful Moon Resources

Moonrise and Moonset

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