Reliable records appear from 960, and Seimei, who was a student of ancient astrology (the studenthood belonging to the Office of Ommyo to learn ancient astrology from the scholar of ancient astrology), was ordered by Emperor Murakami to perform a divinatory reading.
確かな記録に現れるのは960年で、当時天文得業生（陰陽寮に所属し天文博士から天文道を学ぶ学生の職）であった晴明は村上天皇に占いを命ぜられた。