How Long Is Anomalistic Month?

It takes the Moon longer to return to the same apsis because it has moved ahead during one revolution. This longer period is called the anomalistic month and has an average length of 27.554551 days (27 d 13 h 18 min 33.2 s).

What is an Anomalistic cycle?

It takes the Moon longer to return to the same apsis because it moved ahead during one revolution. This longer period is called the anomalistic month. ... The plane of the Moon's orbit precesses over a full circle in about 18.6 years, so the nodes move backwards over the ecliptic with the same period.

What is a lunar month and how long is it?

What is a lunar month? It's the duration between successive new moons. Also called a lunation or synodic month, it has a mean period of 29.53059 days (29 days 12 hours and 44 minutes). That's the mean, but the the true length varies throughout the year.