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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!
Take those 4 minutes a day, each day for a year, and it adds up to one extra day, or spin. It takes the earth roughly 24 hours to spin on its axis. 24 hours It takes 3minutes 56seconds less than 24hours for the Earth to spin (rotate) once on it's axis.It takes 365.2422days for the Earth to revolve once around the Sun.he period of this actual rotation is approximately 25.6 days at the equator and 33.5 days at the poles. However, due to our constantly changing vantage point from the Earth as it orbits the Sun, the apparent rotation of the star at its equator is about 28 days.