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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!
Venus s rotation takes longer than a year and it rotates backwards. Note that a rotation is when an object spins once on its own axis. Our planet takes only 24 hours, or one full Earth day, to rotate on its axis and a year to revolve around the Sun.Venus, however, takes 243 days to turn one time on its axis and almost 225 days to revolve around the Sun in orbit. Strangely, a year on Venus is shorter than a day.ote that a rotation is when an object spins once on its own axis. Our planet takes only 24 hours, or one full Earth day, to rotate on its axis and a year to revolve around the Sun. Venus, however, takes 243 days to turn one time on its axis and almost 225 days to revolve around the Sun in orbit.