The moon is the earth's only natural satellite and the closest celestial object. Learn about the moon and some of the theories about the moon's origin. Find the moonÒ€ℒs illumination, distance, and latitude for any time on any date.

Here's all you need to know about each Ò€¦ In geophysical terms, the moon is a planetary-mass object or satellite planet. Its mass is 1. 2% that of the earth, and its diameter is 3,474 km (2,159 mi), roughly one-quarter of earth's (about as wide as the Ò€¦