<Tr> <Td> precession of nodes </Td> <Td> 18.5996 years </Td> </Tr> <Tr> <Td> precession of line of apsides </Td> <Td> 8.8504 years </Td> </Tr> <P> The Moon orbits Earth in the prograde direction and completes one revolution relative to the stars in approximately 27.323 days (a sidereal month). Earth and the Moon orbit about their barycentre (common center of mass), which lies about 4,600 km (2,900 mi) from Earth's center (about 3 / 4 of the radius of Earth). On average, the distance to the Moon is about 385,000 km (239,000 mi) from Earth's centre, which corresponds to about 60 Earth radii . With a mean orbital velocity of 1.022 km / s (2,290 mph), the Moon appears to move relative to the stars each hour by an amount roughly equal to its angular diameter, or by about half a degree . The Moon differs from most satellites of other planets in that its orbit is close to the plane of the ecliptic, and not to Earth's equatorial plane . The plane of the lunar orbit is inclined to the ecliptic by about 5 °, whereas the Moon's equatorial plane is inclined by only 1.5 ° to the ecliptic . </P> <P> The properties of the orbit described in this section are approximations . The Moon's orbit around Earth has many irregularities (perturbations), whose study (lunar theory) has a long history . </P>

How many days does it take for the moon to rotate around the earth