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Encyclopedic overview
In lunar calendars, a lunar month is the time between two successive syzygies of the same type: new moons or full moons. The precise definition varies, especially for the beginning of the month.
Animation of the Moon as it cycles through its phases, as seen from the Northern Hemisphere. The apparent wobbling of the Moon is known as libration.
Excerpted from Wikipedia’s “lunar month” article, available under the CC BY-SA 4.0 licence.