Leap Day: The Story Behind This Quirky Calendar Event

Initially, in order to make a proper transition from the Roman calendar (which had 355 days and which was basically a lunar calendar) to the Julian calendar, and to get the months and various feast days and holidays back into their normal seasons, 90 extra days were inserted into the year 46 B.C. Caesar divided these 90 extra days into three temporary months. Two other months (Intercalaris Prior and Intercalaris Posterior) were added after November. The Julian calendar worked so well at first th