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A common year is a year that is common calendar year. It has exactly 365 days and so is not a leap year. More generally it is a calendar year without intercalation.

A common year of 365 days has exactly 52 weeks and one day, so consequently the next new year is one day of the week later.

For example, the current year, 2021, which is a common year, began on Friday, therefore 2020 began on a Wednesday.

In the Gregorian calendar, 303 of every 400 years are common years. By comparison, in the Julian Calendar, 300 out of every 400 years were common years (3 out of 4 years).

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