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An Olympiad ((ギリシア語:Ὀλυμπιάς), ''olympiás'') is a period of four years associated with the Olympic Games of the Ancient Greeks. During the Hellenistic period, beginning with Ephorus, it was used as a calendar epoch. By this reckoning, the first Olympiad lasted from the summer of 776 BC to that of 772 BC. By extrapolation to the Gregorian calendar, the |0 = 1st |1 = 2nd |2 = 3rd |3 = 4th }} year of the th Olympiad begins in (Northern-Hemisphere) mid-summer . A modern Olympiad refers to a four-year period beginning January 1 of a year in which the Summer Olympics are due to occur. The first modern Olympiad began in 1896, the second in 1900, and so on (the 30th began in 2012: see the (Olympic Charter )). == Ancient Olympics == An Olympiad was a period of four years. Example: Olympiad 140, year 1 = 220/219 BC; year 2 = 219/218 BC; year 3 = 218/217 BC; year 4 = 217/216 BC. 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「Olympiad」の詳細全文を読む スポンサード リンク
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