ocr: The Moon's Orbit The Moon orbits around the. Earth. It completes a revolution in 29 days, and is the basis for the lunar calendar we use in our daily lives. Due to gravitational forces over a long period of time, the moon has locked into an orbit which keeps the same side facing the Earth. Over millions of years, the moon's spin has slowed from Earth's gravitational presence, and has fiattened" very slightly SO more mass is aligned with the Earth. This combination results in the moon's rotational period equaling its orbital period.
