Harpalus

, a great astronomer, who flourished about 480 years before Christ, corrected the cycle of eight years invented by Cleostratus, and in its stead proposed a new one of nine years, in which he supposed that the sun and moon returned to the same point; but this cycle of Harpalus was afterwards altered by Meton, about the year 444 B. C. who added ten years to it, which cycle is still in use, and called “The Golden Number.” ²