Noun
period between successive conjunctions with a star, 27.322 days
Source: WordNetAn anomalistic month is longer than a sidereal month because the perigee moves in the same direction as the Moon is orbiting the Earth, one revolution in nine years. Source: Internet
A synodic month is longer than a sidereal month because the Earth-Moon system is orbiting the Sun in the same direction as the Moon is orbiting the Earth. Source: Internet
Unlike the sidereal month, it can be measured precisely. Source: Internet