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

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 ...

4 Leap years were introduced by the Roman emperor Julius Caesar, who created a new calendar to take the extra quarter-days into account. The Julian calendar took effect in 45 BC. 5 The maths ...

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 ...

Why does Leap Year occur once every 4 years? Our calendar is not entirely in sync with our planet’s trip around the sun. If your birthday is on Feb. 29, what date do you use for official ...

These reforms were implemented around 45 BCE, roughly a year before his death, and came to be known as the Julian calendar. The revamped system had 365 days, with a leap year added every four ...