As Iranians celebrate the Persian New Year, explore the fascinating calendars still used around the world—shaped by sun, moon, and tradition—to mark time, faith, and cultural identity.

The Jewish calendar is a lunisolar calendar based on lunar ... according to the Old Farmer's Almanac. In the Gregorian calendar, it is always observed on a Sunday between March 22 and April 25. "Over ...

Easter's date is based on the lunar calendar. Easter is observed on the first Sunday after the first full moon following the spring equinox. Easter can be as early as March 22 or as late as April 25.