Have a look at the whos, whats and whens of leap year through time

NEW YORK — 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.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 leap year exists, in large part, to keep the…