Moon Phase -- from Eric Weisstein's World of Astronomy
By A Mystery Man Writer
Moon phases occur with a period equal to the synodic period of the moon, equal to 29.530589 days, or 29 days, 12 hours, 44 minutes, 3 seconds. However, there is a great deal of variation in the actual time for a given lunation (the time between two successive new moons). The phase of the moon is determined by its position relative to the Sun (which illuminates the side of the Moon facing it) and the Earth (from where the Moon is observed). Moonrise and moonset times correspond directly to the
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