CYCLE

(Yunanca köken — orijinale bakınız.) The revolution of a certain period of time which finishes and recommences perpetually. Cycles were invented for the purposes of chronology, and for marking the intervals in which two or more periods, of unequal length, are each completed a certain number of times, so that both begin exactly in the same circumstances as at first. The cycles used in chronology are three; the cycle of th's un, the cycle of the moon or Metonic cycle, and the cycle of indiclion. 312 [s. 326]