How long does it take for the Moon to complete one orbit around the Earth?

The Moon takes approximately 27.3 days to complete one full orbit around the Earth, a period known as a sidereal month. This duration is a result of the Moon's orbital path relative to the stars, as the Earth is also moving in its orbit around the Sun. Thus, while the Moon completes its orbit relative to the stars in about 27.3 days, it appears to go through its phases—new moon to full moon and back—over the course of approximately 29.5 days, which is called a synodic month.

This 27.3-day cycle is significant for understanding lunar phases, tides, and various aspects of astronomy related to the Earth-Moon system. The duration reflects the gravitational dynamics between the Earth and the Moon and is consistent with the observed orbital mechanics of celestial bodies in our solar system.