Ever wonder how the leap year was established and exactly what would happen if we didn't have one every 4 years? Basically, the leap year shift keeps the calender in line with our seasons. USA Today published an interesting article about why we have a leap year, with a brief history of the bonus day.

According to the article, the Earth doesn't rotate around the sun in exactly 365 days, but rather 365.2425 days. Without a leap year, that would add up to almost a full day every four years...and our calender would soon be out of sync with the seasons. So, who first came up with the brilliant leap year solution? It sounds like we've got Julius Caesar and Pope Gregory XIII to thank. Check out the full article HERE (it's quite interesting).

Happy Leap Year!