Final answer:
The Moon revolves around the Earth about every 30 days, with a sidereal month of 27.3217 days and a solar month of 29.5306 days due to the Earth's motion around the Sun.
Step-by-step explanation:
The Moon completes its orbit around the Earth approximately every 30 days. This period is known as the lunar cycle, which can be divided into two different measurements: the sidereal month and the solar month. The sidereal month is about 27.3217 days, which is the time it takes for the Moon to return to the same position against the background stars. The solar month is about 29.5306 days, which is the duration from one new moon to the next, accounting for the movement of the Earth around the Sun which affects the Moon's position relative to the Sun.
Because the Earth moves during the Moon's orbit, the Moon has to travel a bit further to catch up, resulting in the slightly longer solar month. The Moon moves eastward in the sky each day by about 12°, or roughly 0.5° every hour. To move a full 360° and complete the cycle, the Moon requires around 720 hours, or close to 30 days when considering a 24-hour day.