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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!
Tagged as. The earth rotates on its axis and one full rotation takes 24 hours to complete. Weâd be very surprised if you didnât already know that, but what you may not know is that the speed of the earthâs rotation can change from day to day and year to year. So a true solar day is not exactly 24 hours, but the variations are a matter of seconds.