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The period of time taken by the Moon to complete one orbit of the Earth.
The length of the month varies according to the reference point.
| Type of month |
Reference point |
Length in days |
| Anomalistic |
Apse |
27.554 55 |
| Draconic |
Node |
27.212 22 |
| Sidereal |
Fixed stars |
27.321 66 |
| Synodic |
Phase |
29.530 59 |
| Tropical |
Equinox |
27.321 58 |
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