Year zero

The presence or absence of year 0 is determined by convention among groups such as historians or astronomers. Neither the calendar (Julian or Gregorian) nor the era (Anno Domini or Common Era) determines that. If writers do not use the convention of their group, they must explicitly state whether or not they include a year 0 in their count of years, otherwise their historical dates will be misunderstood.

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No historians include a year 0 when numbering years in the current standard era. Thus, regardless of the appellation or calendar employed (Julian or Gregorian), 1 BC (or 1 BCE) always immediately precedes AD 1 (or 1 CE). Historians even refuse to use a year 0 when using negative years before our positive era, hence their −1 immediately precedes 1 (for example, V. Grumel, La chronologie (1958), page 30).

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The anno Domini method of numbering years was not widely used in Western Europe until the 9th century, and the 1 January to 31 December historical year was not uniform throughout Western Europe until 1752. The terms anno Domini, Dionysian era, Christian era, vulgar era, and common era were used interchangeably between the Renaissance and the 19th century, at least in Latin. But vulgar era was suppressed in English at the beginning of the twentieth century after vulgar acquired the meaning of "offensively coarse", replacing its original meaning of "common" or "ordinary". Consequently, historians regard all these eras as equal.

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However, at least two groups do include a year 0 when they number the years before these eras: astronomers and some Maya historians. In addition, some calendars of South Asia begin their counts of years with a year 0.

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Julian: Julian, also spelled Julien, is a common male given name in Britain, United States, Ireland, Germany, Poland, France (as Julien) and elsewhere....

Gregorian: For information on the calendar, see: Gregorian CalendarFor the music style, see: Gregorian chantFor medieval usage see: Gregorian reformFor the music group see: Gregorian (music group)For the University in Rome: Gregorian UniversityThe Armenian Orthodox Church is sometimes called the Gregorian Chur...

Anno Domini: Anno Domini (Latin: "In the Year of the Lord"), or more completely Anno Domini Nostri Iesu Christi ("In the Year of Our Lord Jesus Christ"), commonly abbreviated AD or A.D., is the designation used to number years in the dominant Christian Era in the world today. This is the conventional designation...

Year zero related Images and Photos (experimental)

Year One	Zero-Nine	Zero Hour (DVD)	Dog Year, A (DVD)
Zero Effect	Zero Effect (DVD)	New Year	Leap Year
Good Year	Leap year	Zero Fog Blaster	Zero Board Game