How long does it take the Moon to revolve around the Earth?

How long does it take the Moon to revolve around the Earth?

• A. 1 year
• B. 29.5 days
• C. 30 days
• D. 27 days

Answer: (D)

The Moon’s revolution around Earth is best described by its sidereal orbital period—the time it takes to return to the same position relative to distant stars. That period is about 27.3 days. Among the given options, 27 days is the closest estimate. The 29.5-day figure relates to the synodic month, which is the cycle of Moon phases and is longer because Earth is also orbiting the Sun. So the best answer is the roughly 27-day sidereal orbit.

The Moon’s revolution around Earth is best described by its sidereal orbital period—the time it takes to return to the same position relative to distant stars. That period is about 27.3 days. Among the given options, 27 days is the closest estimate. The 29.5-day figure relates to the synodic month, which is the cycle of Moon phases and is longer because Earth is also orbiting the Sun. So the best answer is the roughly 27-day sidereal orbit.