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秒者,亦稱秒鐘,萬國公制之度也,以計時。六十秒為一分,六十分為一小時,二十四小時為一日。
初,以日定秒,故一秒為一日之八萬六千四百分之一也。然地球自傳未有定數,一日時長不一,故諸國公議,以銫原子躍遷九十一億九千二百六十三萬一千七百七十週為一秒[1]。
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