A month measured between successive perigees of the moon (approximately 27 1/2 days).
- The anomalistic month is the average interval between successive passages of the moon through its perigee.
- The time between consecutive perigees or apogees, the anomalistic month, is 27.56 days.
- This relation between synodic months and anomalistic months of the Moon was known to Babylonian astronomers, who used it to predict the return of lunar and solar eclipses.
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