Why do we have leap years, and what are we supposed to do — or not do — with our rare extra day? NPR's Morning Edition spoke with experts in astronomy, history and economics to find out.

Here’s what else to know about leap year. Why do we have leap years? The most common explanation is to keep the calendar in step with the seasons.

Since Leap Year occurs once every four years — 2020, 2024 and 2028 is the next one, for example — this "Leap Day math" applies to people born Feb. 29.