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A lunar day is the period of time for Earth's Moon to complete one rotation on its axis with respect to the Sun. Due to tidal locking, this equals the time that the Moon takes to complete one orbit around Earth (Earth rise to Earth set) plus about 2.2 more Earth days to return to the same Moon phase (due to the Moon's orbit around the Sun). The lunar day is roughly 29 1/2 Earth days, the length of a lunar month, and the time of which includes a full day-night cycle.