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Planets orbit the Sun while moons orbit around planets. The amount of time required for a planet or moon to complete one orbit around another body is called an orbital period. On Earth, we call this orbital period a year. Our year is 365.256 days. On Mars it takes 686.98 days (Earth days, that is) to complete one orbit about the Sun--that's a long time to wait between birthdays!
It takes 27.3 days for the Moon to complete one full orbit around the Earth. how long does it take for the earth to rotate around the sun? It takes exactly 365 and a quarter d â¦ ays for the earth to orbit around the sun once.