Bible Encyclopedias
Lunation
1911 Encyclopedia Britannica
the period of return of the moon (luna) to the same position relative to the sun; for example, from full moon to full moon. Its duration is 2 9.530588 4 days.
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Bibliography Information
Chisholm, Hugh, General Editor. Entry for 'Lunation'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/l/lunation.html. 1910.