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Common Era (abbreviated as CE; also Current Era)〔 〕 is a calendar era based on the Gregorian calendar that is often used as an alternative naming of the controversial ''Anno Domini'' system ("in the year of the/our Lord", abbreviated AD).〔 (【引用サイトリンク】title=Controversy over the use of the "CE/BCE" and "AD/BC" dating notation ) 〕〔 〕 The system uses BCE as an abbreviation for before the Common (or Current) Era and CE as an abbreviation for in the Common Era. The CE/BCE designation uses the year-numbering system introduced by the 6th-century Christian monk Dionysius Exiguus, who started the ''Anno Domini'' designation, intending the supposed beginning of the life of Jesus to be the reference date.〔 〕〔 〕 Neither notation includes a year zero, and the two notations (CE/BCE and AD/BC) are numerically equivalent; thus " CE" corresponds to "AD ", and "400 BCE" corresponds to "400 BC". The expression "Common Era" can be found as early as 1708 in English,〔 and traced back to Latin usage among European Christians to 1615, as ''vulgaris aerae'',〔 and to 1635 in English as ''Vulgar Era''. At those times, the expressions were all used interchangeably with "Christian Era". The Gregorian calendar and the year-numbering system associated with it is the calendar system with most widespread use in the world today. For decades, it has been the global standard, recognized by international institutions such as the United Nations and the Universal Postal Union. Use of the CE abbreviation was introduced by Jewish academics in the mid-19th century. Since the later 20th century, use of CE and BCE has been popularized in academic and scientific publications and more generally by authors and publishers wishing to emphasize secularism and/or sensitivity to non-Christians,〔〔 〕 because it does not explicitly make use of religious titles for Jesus, such as "Christ" and ''Dominus'' ("Lord"), which are used in the BC/AD notation, nor does it give implicit expression to the Christian creed that Jesus was the Christ.〔〔''Anno Domini'' (which means ''in the year of the/our Lord'') Translated as "in the year of (Our) Lord" in Blackburn, B & Holford-Strevens, L, (2003), ''The Oxford Companion to the Year'', Oxford University Press, 782.〕〔 〕〔 〕〔 〕 ==History== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Common Era」の詳細全文を読む スポンサード リンク
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