# The period of the moons orbit about the Earth is 27.3 days but the average time between full months is approximately 29.3 days. Through what fraction of its total orbital period does the Earth move in one period of the moon's orbit?

Jan 20, 2016

1 in 12.37

#### Explanation:

Lunar orbit with respect to Earth-Sun longitudinal plane is 20.53 days, nearly. The Earth-Sun longitudinal plane revolves through 360 deg in 365.256 days, nearly. This ratio is nearly 1/12.37.