But why do we need leap anything at all? Leap years are useful because the calendar drifts quickly (well, over centuries) enough for seasons shifting to become

But why do we need leap anything at all? Leap years are useful because the calendar drifts quickly (well, over centuries) enough for seasons shifting to become noticeable. Leap seconds correct for a problem that’s much slower, with already existing much larger errors (time zones anyone?). It’s a science project with no useful application in the real world.