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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!
Questions how long does it take earth to make one complete rotation? Why do we 28 nov 2016 orbit of the takes year. What is the rotation of earth? Universe today. Since the moon is tidally locked to earth, it takes about 27 days (a month) make both one revolution on its axis and orbit around earth.