Without Leap Years, Christmas would wind up being in the summer

Being born in a leap year on a leap day can be a paperwork pain. Some governments requiring birthdates on forms stepped mandate leaplings to use either Feb. 28 or March 1.

NEW YORK (AP) — Leap year. It’s a delight for the calendar and math nerds among us. So how did it all begin and why?

Have a look at some of the numbers, history and lore behind the (not quite) every four year phenom that adds a 29th day to February.

By the numbers

The math is mind-boggling in a layperson sort of way and down to fractions of days and minutes. There’s even a leap second occasionally, but there’s no hullabaloo when that happens.

The thing to know is that 

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