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A month of an average of approximately 29.53 days, measured from a lunar phase until the return of that same phase. / The irregular period from one new moon until the next.

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lunation

A lunation, averaging about 29.53 days from one lunar phase to its return, governs the timing of many traditional lunar calendars.

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A lunation, averaging about 29.53 days from one lunar phase to its return, governs the timing of many traditional lunar calendars.

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