SOLAR SYSTEM

Detailed explanation-1: -The correct answer is 27.3 days. The moon orbits the Earth once every 27.322 days.

Detailed explanation-2: -The Moon takes about one month to orbit Earth (27.3 days to complete a revolution, but 29.5 days to change from New Moon to New Moon). As the Moon completes each 27.3-day orbit around Earth, both Earth and the Moon are moving around the Sun.

Detailed explanation-3: -The Moon revolves around Earth in an elliptical orbit with a mean eccentricity of 0.0549. Thus, the Moon’s center-to-center distance from Earth varies with mean values of 363, 396 km at perigee to 405, 504 km at apogee.

Detailed explanation-4: -The moon orbits the Earth once every 27.322 days. It also takes approximately 27 days for the moon to rotate once on its axis. As a result, the moon does not seem to be spinning but appears to observers from Earth to be keeping almost perfectly still. Scientists call this synchronous rotation.

Detailed explanation-5: -The Earth interacts with the Moon by the virtue of its gravitational force. Without gravitation acting on the moon, it would fly away. Hence, gravitation is responsible for revolution of moon about earth.