Common year starting on Friday - AbsoluteAstronomy.com

This is the calendar

Calendar

A calendar is a system of organizing days for social, religious, commercial, or administrative purposes. This is done by giving names to periods of time, typically days, weeks, months, and years. The name given to each day is known as a date. Periods in a calendar are usually, though not...

for any common year
Common year
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....

starting on Friday
Friday
Friday is the day between Thursday and Saturday. In countries adopting Monday-first conventions as recommended by the international standard ISO 8601, it is the fifth day of the week. It is the sixth day in countries that adopt a Sunday-first convention as in Abrahamic tradition...

, January 1 (dominical letter

Dominical letter

Dominical letters are letters A, B, C, D, E, F and G assigned to days in a cycle of seven with the letter A always set against 1 January as an aid for finding the day of the week of a given calendar date and in calculating Easter....

C). Examples: Gregorian

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...

years 1993, 1999, 2010 and 2021
or Julian

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...

years 1910 and 1899 (see bottom tables).

A common year

Common year

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....

is a year with 365 days, i.e., 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...

Millennium	Century	Gregorian Year
2nd Millennium:	19th century:	1802	1813	1819	1830	1841	1847	1858	1869	1875	1886	1897
2nd Millennium:	20th century:	1909	1915	1926	1937	1943	1954	1965	1971	1982	1993	1999
3rd Millennium:	21st century:	2010	2021	2027	2038	2049	2055	2066	2077	2083	2094	2100
3rd Millennium:	22nd century:	2106	2117	2123	2134	2145	2151	2162	2173	2179	2190

Millennium	Century	Julian Year
2nd Millennium:	19th century:	1809	1815	1826	1837	1843	1854	1865	1871	1882	1893	1899
2nd Millennium:	20th century:	1910	1921	1927	1938	1949	1955	1966	1977	1983	1994
3rd Millennium:	21st century:	2005	2011	2022	2033	2039	2050	2061	2067	2078	2089	2095
3rd Millennium:	22nd century:	2106	2117	2123	2134	2145	2151	2162	2173	2179	2190

This is the only year type where the nth "Doomsday

Doomsday (weekday)

The Doomsday rule or Doomsday algorithm is a way of calculating the day of the week of a given date. It provides a perpetual calendar since the Gregorian calendar moves in cycles of 400 years....

" (this year Sunday) is not in ISO week

ISO week date

The ISO week date system is a leap week calendar system that is part of the ISO 8601 date and time standard. The system is used in government and business for fiscal years, as well as in timekeeping....

n; it is in ISO week n-1.

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