Space Luisa Fernanda
Space, astronomy, rockets and the physics of it all.
Friday, October 16, 2026 · UTC
Missions & Exploration

NASA says lunar cycle lasts 29.5 days, lists eight moon phases

The U.S. space agency states the Moon completes a full cycle in roughly 29.5 days, and the eight phases run from New Moon to Waning Crescent.

Luisa Marconi
Senior Space Correspondent
Share on X
Stands on 6 placed sources from 2 publishers.
NASA states the lunar cycle lasts roughly 29.5 days as the Moon orbits Earth.[2] The figure appears in two separate reports.[2][5]