Question 1596Navigation General

The correct answer is B) about 27.3 days. The period of rotation of the Moon on its axis is approximately 27.3 days, which is the same as the time it takes for the Moon to orbit the Earth. This is known as the Moon's sidereal period, which is the time it takes for the Moon to complete one full rotation relative to the fixed stars. The other answer choices are incorrect because: A) 365 days is the length of the Earth's orbit around the Sun, not the Moon's rotation on its axis. C) 24 hours is the length of one day on Earth, not the Moon's rotation period. D) About 19 years is the length of the Moon's "eclipse year", which is the time it takes for the Moon's phases to repeat, not its rotation period.