As Iranians celebrate the Persian New Year, explore the fascinating calendars still used around the world—shaped by sun, moon ...

For centuries, churches have used different methods to calculate the date of Easter. Rarely do they coincide. The search for ...

The calendar someone uses can change the date of Easter even more. Different branches of Christianity use different ones: ...

Also known as the Hijri calendar, the Islamic calendar is based on the cycles of the moon, unlike the more widely used Gregorian calendar, which is based on the sun. The lunar calendar is used ...

Today Muslims all over the world abide by the Islamic lunar calendar, however most will live their day-to-day lives using the more widely used Gregorian calendar. Saudi Arabia and other Gulf ...