Category:Centuries - Revision history

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{{Commons category|Centuries}}
{{Cat main|Century}}

<div style="margin: 1em auto; border: 1px solid blue; width: 70%; background-color: #CCeeEE; padding: 1em; font-size: 90%; text-align: center;">The AD/BC notation does not use a [[year zero]]; however, [[astronomical year numbering]] does use a minus sign, so '2 BC' is equal to 'year -1', '1 BC' is equal to [[astronomical year|astronomical 'year 0']], and so forth. In the [[Gregorian calendar|Gregorian system]], the Nth century [[Anno Domini|AD]] starts in the year (N-1)100+1 and ends in year N100, so for example, the 16th century begins on January 1, 1501 and ends December 31, 1600.

However, year order is reversed in the [[Anno Domini|BC]] era, so the Nth century BC ''begins'' in the year N100 BC and ''ends'' in (N-1)100+1 BC, so for example the third century BC begins in 300 BC and ends 201 BC.</div>

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[[Category:Chronology| 2]]
[[Category:Units of time]]
[[Category:History by period|*6]]