How Many Leap Years Since 2025. A leap year is a year containing one additional day and has 366 days. Ideal for planners, historians, & anyone needing accurate leap year identification.
A leap year is a year with an extra day added to keep the calendar synchronized with the astronomical year (revolution around the sun). 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 or seasonal.
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