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 NNth century [[Anno Domini|AD]] starts in the base year 'NN-100+1' and ends in the 'NN'th year, so for example, the [[16th century]] begins on January 1st, [[1501]] and ends December 31st, [[1600]].  
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<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 N*100, so for example, the 16th century begins on January 1, 1501 and ends December 31, 1600.  
  
 
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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.
However, year order is reversed in [[Anno Domini|BC]] since there is no year zero and <u>no century zero</u> creating a ninety-nine year shift'', so the calculation is ''''Nth century BC' begins in year 'N BC'''' and ends in ''''N-99 BC'''' so that the [[third century BC]], begins in [[300 BC]] and ends [[201 BC]].</small>
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[[Category:Historical period templates]]
{{Cat also|*{{PAGENAME}}|Centuries|Chronology|History by period|Historical period templates|Historical eras}}
 
 
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[[Category:Historical period templates]]
 

Latest revision as of 10:49, 4 August 2017

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 31, 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.