Why do we have Leap years?
Most people know that a single day is about 24 hours long, and that there are 365 days in a year.
But it actually takes Earth 365.242190 days to orbit the sun, says Jackie Faherty, an astronomer at the American Museum of Natural History in New York,
"And that .242190 days to go around the sun is the entire reason why we have a leap year," she explained.