KAMO no Yasunori taught everything there is to know about the art of calendar-making to his heir KAMO no Mitsuyoshi and astronomy to his student ABE no Seimei, and since both turned their learning into an esoteric art which was passed down by succession within their own respective families, ABE's astronomy acquired an extremely specific characteristic of forecasting disasters and auspicious signs, whereas, the art of calendar-making of the KAMO family changed into an art with a distinctively strong flavor of Sukuyodo rather than rekido in its pure form.
そして賀茂保憲が、その嫡子の賀茂光栄に暦道を、弟子の安倍晴明に天文道をあまなく伝授禅譲して、それぞれがこれを家内で世襲秘伝秘術化したため、安倍家の天文道は極めて独特の災異瑞祥を説く性格を帯び、賀茂家の暦道は純粋な暦道というよりはむしろ宿曜道的色彩の強いものに独特の変化をとげていった。