synodic month

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The average time between successive new Moons, which is equal to 29 days, 12 hours, and 44 minutes. This period is curiously correlated with the average length of the human female menstrual cycle (29.5 days), while the average length of human pregnancy (266 days) equals nine synodic months (265.8 days).

Subjects: Astronomy and Astrophysics — Earth Sciences and Geography.

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