sioc:Post

マヤ最古の“カレンダー”続報

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dct:date 2012-06-26T20:19+09:00

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sioc:Post

閏秒と閏時

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dct:date 2012-08-18T00:00+09:00

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sioc:Post
7月1日(日本時間)に閏秒

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マヤ最古の“カレンダー”続報

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