Since Seimei, the Abe clan, along with the Kamo clan, ruled tenmon (ancient horoscopy) and Onmyodo (way of Yin and Yang; occult divination system based on the Taoist theory of the five elements), which is a widely known story.
晴明以後、安倍氏が賀茂氏とともに天文と陰陽道を司ったというのは著名な話である。