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The Moon is Earth's only natural satellite. It orbits around Earth at an average distance of 384400 km (238900 mi; 1.28 ls), or about 30 times Earth's diameter. The Moon faces Earth always with its near side by having a rotation period that equals its orbital period, resulting from being tidally locked to Earth. This period is in relation to the Sun 29.5 days long and visible as the cycle of the lunar phases. For Earth, the Moon has been aside from the Sun the most influential celestial object, particularly with its gravitational influence it has been the main driver of Earth's tides.
