What is the X in X-mas?
|lunar month |
The average time between successive occurrences of the same phase of the Moon, equal to approximately 29 days, 12 hours, 44 minutes. Depending on the lunar calendar being used, a lunar month can begin with the new moon or the full moon. Also called lunation, synodic month. ◇ A period of 12 lunar months is a lunar year.