When 1460-1 years had elapsed this chronological error had mounted to a whole year, and so the movable year and the fixed year fell together again. It is this Sothic period which Manetho has employed in his account of Egyptian history. Besides his history, Manetho has left us a work on astrology, called Apotelesmatica, or Events, a work of which there seems no reason to doubt the genuineness.