how long is a lunation cycle
The Lunation Number or Lunation Cycle is a number given to each lunation beginning from a certain one in history. Several conventions are in use.or all new moons between 1601 and 2401, the maximum difference is 0.592 days = 14h13m in either direction. The duration of a lunation (i.e. the time from new moon to the next new moon) varies in this period between 29.272 and 29.833 days, i.e. â0.259d = 6h12m shorter, or +0.302d = 7h15m longer than average.