Difference between revisions of "Template:Centuriesdatenote"
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| − | <center><div style="border:1px solid blue;width:70%;background-color:#CCeeEE;padding: 1em;Margin: 1em 3em 1em 3em;"><small>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 | + | <center><div style="border:1px solid blue;width:70%;background-color:#CCeeEE;padding: 1em;Margin: 1em 3em 1em 3em;"><small>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 N*100, so for example, the [[16th century]] begins on [[January 1]], [[1501]] and ends December 31st, [[1600]]. |
| − | + | However, year order is reversed in the [[Anno Domini|BC]] era, so the Nth century BC ''begins'' in the year N*100 BC and ''ends'' in (N-1)*100+1 BC, so for example the [[third century BC]] begins in [[300 BC]] and ends [[201 BC]].</small> | |
| − | However, year order is reversed in [[Anno Domini|BC]] | ||
</div></center><noinclude> | </div></center><noinclude> | ||
{{Cat also|*{{PAGENAME}}|Centuries|Chronology|History by period|Historical period templates|Historical eras}} | {{Cat also|*{{PAGENAME}}|Centuries|Chronology|History by period|Historical period templates|Historical eras}} | ||
</noinclude> | </noinclude> | ||
Revision as of 20:15, 29 September 2008
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 0', and so forth. In the Gregorian system, the Nth century AD starts in the year (N-1)*100+1 and ends in year N*100, so for example, the 16th century begins on January 1, 1501 and ends December 31st, 1600.
However, year order is reversed in the BC era, so the Nth century BC begins in the year N*100 BC and ends in (N-1)*100+1 BC, so for example the third century BC begins in 300 BC and ends 201 BC.