What is "greek paschal cycle"

Dionysian \Di`o*ny"sian\, a. Relating to Dionysius, a monk of the 6th century; as, the Dionysian, or Christian, era.

Dionysian period, a period of 532 years, depending on the cycle of the sun, or 28 years, and the cycle of the moon, or 19 years; -- sometimes called the Greek paschal cycle, or Victorian period.