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The Moon's Orbit and Rotation. It takes the Moon 27.322 days to go around the Earth once. Because of this motion, the Moon appears to move about 13 against the stars each day, or about one-half degree per hour.
How long does it take for Neptune to rotate on its axis? The planet Neptune takes about 16 hours, 6 minutes, 36 seconds for  one complete rotation, as evidenced by its visible outer  atmosphere. This is a day on Neptune.   â¦  That's about 2/3rds of an earth day. Note that the period of  rotation is measured by watching Neptune's magnetic field.