Is 2024 A Leap Year How To Calculate. Computations on dates that use a century date greater than or equal to 4000. A leap year (or intercalary year or bissextile year) is a calendar year that contains an additional day added to keep the calendar year synchronized with the astronomical year.

It takes approximately 365.25 days for earth to orbit the sun — a solar year. A leap year (or intercalary year or bissextile year) is a calendar year that contains an additional day added to keep the calendar year synchronized with the astronomical year.