How long does it take for the Moon to complete one full cycle of its phases, from new moon to new moon?
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The Moon completes a full cycle of its phases, known as a synodic month, in approximately 29.5 days. This period is longer than the Moon's actual orbital period around Earth (a sidereal month, about 27.3 days) because Earth is also moving around the Sun. The extra time accounts for the Moon needing to "catch up" to its relative position for the same phase to recur. Photo: Andonee, Wikimedia Commons, CC BY-SA 4.0.
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Source: Wikipedia (CC BY-SA)
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