How long does it take the moon to go from full moon phase to new moon phase?

A. four weeks

B. two weeks

C. one week

D. three weeks

Answer: About 4 weeks

Explanation: about 29.5 days

It takes 27 days, 7 hours, and 43 minutes for our Moon to complete one full orbit around Earth. This is called the sidereal month, and is measured by our Moon's position relative to distant "fixed" stars. However, it takes our Moon about 29.5 days to complete one cycle of phases (from new Moon to new Moon).

The answer is A, four weeks (the lunar cycle is about 29.5 days).