St. Louis Science Center: Astronomy Fact Of The Day: November 20, 2021

Press release from St. Louis Science Center:

November 20, 2021

The Moon reaches apogee tonight when the Earth and Moon will be separated by 406,279 km. Over a period of 27.5 days, the Moon reaches its apsides. Apsides represent the close and far points in an objects orbit. For the Moon, these points are called perigee (closest) and apogee (farthest). An anomalistic month is a measure of successive lunar perigees which is 27.5 days.

This press release was produced by St. Louis Science Center. The views expressed here are the author’s own.