anomalistic month

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Related to anomalistic month: Months, sidereal month
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period between successive perigees

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Anomalistic month (cycle of perigean tides) = 27.555 days; synodic month (cycle of Moon's phases in which there are two sets of spring and neap tides) = 29.531 days; tropical month (cycle in which Moon crosses the Equator twice) = 27.322 days.
Note that if one used 246 anomalistic months (18.558 years), 247 anomalistic months (18.634 years), or 252 anomalistic months (19.011 years), the multiples of other types of months are not nearly as closely matched as with 18.03 years.