Common year
A Common year is a calendar year with exactly 365 days, in contrast to the longer leap year. 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: both January 1 and December 31 fell on a Friday in 2010). In a common year, February has exactly four weeks, so that month and March always start consecutively on the same day of the week.
- 2001 began on a Monday.
- 2002 began on a Tuesday.
- 2003 began on a Wednesday.
- 2005 began on a Saturday.
- 2006 began on a Sunday.
- 2007 began on a Monday.
- 2009 began on a Thursday.
- 2010 began on a Friday.
- 2011 began on a Saturday.
- 2013 began on a Tuesday.
- 2014 began on a Wednesday.
- 2015 began on a Thursday.
- 2017 will begin on a Sunday.
- 2018 will begin on a Monday.
- 2019 will begin on a Tuesday.
- 2021 will begin on a Friday.
- 2022 will begin on a Saturday
- 2023 will begin on a Sunday.
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.
In the Lunisolar calendar and the Lunar calendar, a common year consists of 354 days.
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