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moon the earth's natural satellite. It revolves around the earth from west to east in about 28 days. The moon joins the earth in its orbit around the sun. The moon does not give off light. Instead, its shine comes from the light it reflects from the sun. [2 definitions]
orbit the curved path in which a planet, satellite, or spacecraft moves in a circle around another body. [1/3 definitions]
satellite A satellite is a round thing in outer space that moves around a planet or other body in space that is larger than itself. Our moon is a satellite of Earth. The moons that go around other planets are also satellites. [2 definitions]