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A year is defined as the time required for the Earth to travel once around the Sun, slightly less than 365 1/4 days.

This fractional number makes necessary the periodic adjustment of days in any calendar that is to be kept in step with the seasons. In the Gregorian calendar, a common year contains 365 days, and every fourth year is a leap year of 366 days except for any year that is divisible by 100 but not divisible by 400 .

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Q: What defines a year?
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