Note 61 — FIRST PART. The Story of Astronomy from Primitive Times until the Age of Dante. (continued 3)
Reading edition
The average year was the same, 365¼ days, in the old 8-year cycle of the Greeks, and also in the Calippic cycle, which did not come into practical use. The average year of the Metonic cycle was longer, and therefore departed further from the true tropical year.