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

Leap years help to keep the 12-month calendar ... In honor of Caesar, this system is still known as the Julian calendar. But that wasn’t the last tweak. As time went on, people realized that ...

On the first day of the new year, when he picks up his tools to start work again, he is two months older. In the 1500s, the old Julian calendar was replaced by the Gregorian calendar.

Leap years help to keep the 12-month calendar ... In honor of Caesar, this system is still known as the Julian calendar. But that wasn’t the last tweak. As time went on, people realized that ...

However, Leap Day is skipped in any year ending in "00" unless that year ... The new system, known as the Julian calendar, was in use for centuries before officials within the Catholic church ...