Common year
Encyclopedia
A common year is a common type of 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 week
s and one day, so consequently the next new year is one day of the week later. Stated differently, a common year always begins and ends on the same day of the week. (For example, in 2010, both January 1 and December 31 fell on a Friday.)
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 has 354 days.
Calendar year
Generally speaking, a calendar year begins on the New Year's Day of the given calendar system and ends on the day before the following New Year's Day. By convention, a calendar year consists of a natural number of days. To reconcile the calendar year with an astronomical cycle , certain years...
. It has exactly 365 days and so is not a leap year
Leap year
A leap year is a year containing one extra day in order to keep the calendar year synchronized with the astronomical or seasonal year...
. More generally, it is a calendar year without intercalation
Intercalation
Intercalation is the insertion of a leap day, week or month into some calendar years to make the calendar follow the seasons or moon phases. Lunisolar calendars may require intercalations of both days and months.- Solar calendars :...
.
A common year of 365 days has exactly 52 week
Week
A week is a time unit equal to seven days.The English word week continues an Old English wice, ultimately from a Common Germanic , from a root "turn, move, change"...
s and one day, so consequently the next new year is one day of the week later. Stated differently, a common year always begins and ends on the same day of the week. (For example, in 2010, both January 1 and December 31 fell on a Friday.)
- 2001 beganCommon year starting on MondayThis is the calendar for any common year starting on Monday, January 1 . Examples: Gregorian year 1990, 2001, 2007 and 2018or Julian year 1918 ....
on a Monday. - 2002 beganCommon year starting on TuesdayThis is the calendar for any common year starting on Tuesday, January 1 . Examples: Gregorian years 1985, 1991, 2002, 2013 and 2019or Julian year 1919 .MillenniumCenturyGregorian Year2nd Millennium:...
on a Tuesday. - 2003 beganCommon year starting on WednesdayThis is the calendar for any common year starting on Wednesday, January 1 . Examples: Gregorian years 1986, 1997, 2003, 2014 and 2025or Julian year 1903 ....
on a Wednesday. - 2005 beganCommon year starting on SaturdayThis is the calendar for any common year starting on Saturday, January 1 . Examples: Gregorian years 1994, 2005, 2011 and 2022...
on a Saturday. - 2006 beganCommon year starting on SundayThis is the calendar for any common year starting on Sunday, January 1 or for any year in which “Doomsday” is Tuesday. Examples: Gregorian years 1989, 1995, 2006, 2017 and 2023or Julian year 1917...
on a Sunday. - 2007 began on a Monday.
- 2009 beganCommon year starting on ThursdayThis is the calendar for any common year starting on Thursday, January 1 . Examples: Gregorian years 1987, 1998, 2009, 2015 and 2026...
on a Thursday. - 2010 beganCommon year starting on FridayThis is the calendar for any common year starting on Friday, January 1 . Examples: Gregorian years 1993, 1999, 2010 and 2021or Julian years 1910 and 1899 ....
on a Friday. - 2011 began on a Saturday.
- 2013 will begin on a Tuesday.
- 2014 will begin on a Wednesday.
In the Gregorian calendar
Gregorian calendar
The Gregorian calendar, also known as the Western calendar, or Christian calendar, is the internationally accepted civil calendar. It was introduced by Pope Gregory XIII, after whom the calendar was named, by a decree signed on 24 February 1582, a papal bull known by its opening words Inter...
, 303 of every 400 years are common years. By comparison, in the Julian calendar
Julian calendar
The Julian calendar began in 45 BC as a reform of the Roman calendar by Julius Caesar. It was chosen after consultation with the astronomer Sosigenes of Alexandria and was probably designed to approximate the tropical year .The Julian calendar has a regular year of 365 days divided into 12 months...
, 300 out of every 400 years were common years.
In the Lunisolar calendar
Lunisolar calendar
A lunisolar calendar is a calendar in many cultures whose date indicates both the moon phase and the time of the solar year. If the solar year is defined as a tropical year then a lunisolar calendar will give an indication of the season; if it is taken as a sidereal year then the calendar will...
and the Lunar calendar
Lunar calendar
A lunar calendar is a calendar that is based on cycles of the lunar phase. A common purely lunar calendar is the Islamic calendar or Hijri calendar. A feature of the Islamic calendar is that a year is always 12 months, so the months are not linked with the seasons and drift each solar year by 11 to...
, a common year has 354 days.