I celebrate the New Year on the new moon before the first full moon after the vernal equinox. The largest cycle I recognize is the cycle
that goes from one occurrence of the new moon and the vernal equinox during the same evening/day period to the next occurrence of
the new moon and the vernal equinox during the same evening/day period.


yes, but if, for example, if said new moon fell on dec. 21 at 1.20am, would you celebrate on the 20th or the 21st? we had our wedding on the full moon in july. however our wedding date was not on the date that the calendar called the full moon. the full moon was exact at 1. something that night, you see, so technically the full moon fell on july 16, but if we'd been married that night, it would not have been the same night that the moon was actually full. (and there is no way anyone would have agreed to waiting until 1am to hold a wedding!)