A Leap Year usually occurs every 4 years, except for century years that aren't evenly divisible by 400. For example, the year 1900 is not a leap year because it's a century year that's not evenly divisible by 400. It takes the orbit 365.242 days to orbit around the sun. Unlike non-leap years, Leap years have 366 days instead of the usual 365 days.
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