Changes

Other cultures, however, have sought to correct this problem by adding an extra month every few years, eventually refined to 7 extra (intercalary) months every 19 years, which is very close to a solar reckoning. This is how many ancient calendars worked, and the Jewish calendar still does so today. The [[Christian]]s inherited from the [[Jews]] a similar system for calculating the date of [[Easter]], since Easter is historically tied to the Jewish [[Passover]] festival.