Approximately how long does it take for the Moon to orbit the Earth?

The Moon takes approximately 27.3 days to complete one full orbit around the Earth, which is known as a sidereal month. This period is measured relative to the stars, meaning it reflects how long it takes for the Moon to return to the same position against the background of stars.

When considering the time it takes for the Moon to go through its phases, which is known as the synodic month (from new moon to new moon), this is about 29.5 days due to the Earth's own movement around the Sun during that time. However, the question specifically asks for the duration of the Moon's orbit relative to the Earth, confirming that 27.3 days is the correct measure.

This precise duration is due to the gravitational dynamics between the Earth and Moon, as well as the relative motion of both celestial bodies in their orbits. Thus, the choice indicating 27.3 days accurately represents the orbital period of the Moon around the Earth.