Take a Leap, Celebrate Leap Day
By D. S. Mitchell and Joe DiBartolomeo
The First Leap Year
The first leap year originated in 46 B.C. when Julius Caesar learned from the astronomer Sosigenes of Alexandra that the 355 day Roman calendar was about 10 1/4 days shorter than the solar calendar. Caesar took action and introduced the 365 day year Julian calendar, and added an intercalary day-Leap Day-every four years to cover the extra 1/4 day.
In Two Hundred Years
It wouldn’t be for another 200 years that astronomers would discover the calendar system was still about 5 hours, 48 minutes, and 46 seconds short. No new changes would be made until 1582 when Pope Gregory XIII introduced a better method for calculating Leap Year. This method has become the system we use today, and it led to February 29th being designated as the standard Leap Day.
