秒
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。
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