Wages . . . bear a full proportion . . . to the medium of provision during the last bad cycle of twenty years.
Burke.

Better fifty years of Europe than a cycle of Cathay.
Tennyson.

We . . . present our gardeners with a complete cycle of what is requisite to be done throughout every month of the year.
Evelyn.

Calippic cycle, a period of 76 years, or four Metonic cycles; -- so called from Calippus, who proposed it as an improvement on the Metonic cycle. -- Cycle of eclipses, a period of about 6,586 days, the time of revolution of the moon's node; -- called Saros by the Chaldeans. -- Cycle of indiction, a period of 15 years, employed in Roman and ecclesiastical chronology, not founded on any astronomical period, but having reference to certain judicial acts which took place at stated epochs under the Greek emperors. -- Cycle of the moon, or Metonic cycle, a period of 19 years, after the lapse of which the new and full moon returns to the same day of the year; -- so called from Meton, who first proposed it. -- Cycle of the sun, Solar cycle, a period of 28 years, at the end of which time the days of the month return to the same days of the week. The dominical or Sunday letter follows the same order; hence the solar cycle is also called the cycle of the Sunday letter. In the Gregorian calendar the solar cycle is in general interrupted at the end of the century.