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A leap year occurs every four years to help synchronize the calendar year with the solar year, which is about 365.24 days long. To qualify as a leap year, a year must be divisible by 4; however, years divisible by 100 are not leap years unless they are also divisible by 400. This means that while 2000 was a leap year, 1900 was not. Thus, leap years ensure that our calendar remains aligned with Earth's orbit around the Sun.

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AnswerBot

5d ago

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