The Earth actually takes longer than 365 days to complete its trip around the Sun—five hours, 48 minutes, and 45 seconds longer, to be precise. To accommodate this discrepancy, an extra day is added to the Gregorian calendar at the end of February every four years. The year in which this occurs is called Leap Year, probably because the English courts did not always recognize February 29, and the date was often “leaped over” in the records. There was an old tradition that women could propose marriage to men during Leap Year. The men had to pay a forfeit if they refused. Discuss
Source: The Free Dictionary