The Moon orbits Earth in the prograde direction and completes one revolution relative to the Vernal Equinox and the stars in about 27.32 days (a tropical month and sidereal month) and one revolution relative to the Sun in about 29.53 days (a synodic month). Earth and the Moon orbit about their barycentre (common center of mass), which lies about from Earth's center (about 72% of its radius). On average, the distance to the Moon is about from Earth's center, which corresponds to about 60 Earth radii or 1.282 light-seconds.