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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!
Each rotation of the Earth takes approximately 24 hours. The Earth's rotation causes alternation of light and darkness which influences, temperatures, wind movements, and humidity. It takes approximately 365 days for the Earth to complete one revolution around the Sun. Because the Earth takes an elliptical path around the Sun, its distance from the Sun will vary.