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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!
Rotation of the Moon According to my science text book, the Moon rotates on its axis in 29 1/2 days. The Moon also revolves around the Earth in 29 1/2 days. Yet in one of the questions, the book said that the Moon spins on its axis in 27 1/3 days and the time from one full moon to the next was 29 1/2 days.