What calculations are used here for determining the Paschal Full Moon?
This website approximates the occurrence of the Paschal Full Moon using the rules of the Jewish calendar. The Jewish calendar is a solar/lunar calendar with each Jewish month starting with the New Moon and the years being synchronized with the seasons. The yearly synchronization is obtained by using a 235 month cycle since such a cycle consists of 19 Jewish years, which is very close to 19 solar years. The Ecclesiastical calculations also use the 19 year cycle, and for the same reason. This suggests a very simple way to approximate the Paschal Full Moon. Since each Jewish month starts with the New Moon, halfway between two month-starts will be the Full Moon. So we simply need to check halfway into each Jewish month until we find the first one that occurs on or after March 21. That would be the Paschal Full Moon. However there is a problem with the method just described. The calculations of the Jewish calendar start by computing the New Moon for each month. That is called the molad of t
