Common year

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A common year is a calendar year with exactly 365 days. More generally, a common year is one without intercalation. The Gregorian calendar (like the earlier Julian calendar) employs both common years and leap years to adjust for differing astronomical measurements of the year: sidereal and tropical.

The common year of 365 days has exactly 52 weeks and one day, hence a common year always begins and ends on the same day of the week. (For example, January 1 and December 31 fell on a Sunday in 2017). In common years, February has exactly four weeks, so that month, March, and November always start consecutively on the same day of the week.

In the Gregorian calendar, 303 of every 400 years are common years. By comparison, in the Julian calendar, 300 out of every 400 years are common years.


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