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For other uses, see Century (disambiguation). "Centennial" redirects here. For other uses, see Centennial (disambiguation). "Centenary" redirects here. For other uses, see Centenary (disambiguation).
A century (from the Latin centum, meaning one hundred) is one hundred consecutive years. It is also a Roman term. Centuries are numbered ordinally in English and many other languages (e.g. "the seventh century CE").
[edit] Start and end in the Gregorian CalendarAccording to the Gregorian calendar, the 1st century C.E. started on January 1, 1 and ended on December 31, 100. The 2nd century started at year 101, the third at 201, etc. The n-th century started/will start on the year 100×n - 99. A century will only include one year, the centennial year, that starts with the century's number (e.g. 1900 is the final year in the 19th century). [edit] End of the 20th centuryIt is a commonly held misconception that the 20th century ended on December 31, 1999. The 20th century actually ended on December 31, 2000, its centennial year.[citation needed]. In the United States, this fact has been disputed with major media calling December 31, 1999 the end of the 20th century. [edit] 1st century CE and BCEThere is no "zeroth century" in between the first century BCE and the first century CE. Also, there is no 0 CE[1]. The Julian calendar "jumps" from 1 BCE to 1 CE. The first century BCE includes the years 100 BCE to 1 BCE. Other centuries BCE follow the same pattern. [edit] Dating units in other calendar systemsBesides the Gregorian calendar, the Julian calendar and the Hindu calendar have cycles of years which are used to delineate whole time periods; the Hindu calendar, in particular, summarizes its years into groups of 60. [edit] Centuries in Astronomical Year NumberingAstronomical year numbering, used by astronomers, includes a year zero (0). Consequently, the first century in these calendars may designate the years 0 to 99 as the first century, years 100 to 199 as the second etc. However, in order to regard 2000 as the first year of the twenty-first century according to the astronomical year numbering, the astronomical year 0 has to correspond to the Gregorian year 1 BCE. [edit] Alternative naming systemsIn Swedish, Danish and Finnish centuries are typically not named ordinally, but according to the hundreds part of the year, and consequently centuries start at even multiples of 100. For example, Swedish nittonhundratalet (or 1900-talet), Danish nittenhundredetallet (or 1900-tallet) and Finnish tuhatyhdeksänsataaluku (or 1900-luku) refer unambiguously to the years 1900–1999. The same system is used informally in English. For example, the years 1900–1999 are sometimes referred to as the nineteen hundreds(1900s). This is similar to the English decade names (1980s = the years 1980–1989). [edit] Notes and References
The Battle of the Centuries, Ruth Freitag, U.S. Government Printing Office. Available from the Superintendent of Documents, P.O. Box 371954, Pittsburgh, PA 15250- 7954. Cite stock no. 030-001-00153-9. [edit] See also
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