When the Moon is not in its new phase, it can be seen on clear days or nights from anywhere on the surface of Earth if you know when to look. The Moon is the Earth’s only natural satellite, and has never been given any other scientific name. The Moon is about 384,403 kilometers from Earth, and has an approximate diameter of 3,476 km. The Moon is actually believed to be slowly moving farther away from Earth, at a rate of about 4cm per year!