ABE no Seimei, who was the disciple of Rekika (scholar of learning of the calendar) KAMO no Tadayuki, ascended to Onmyoji (yin yang master) after holding the position of Tenmon tokugyo no sho (researcher of the astrology), and finally up to Tenmon hakase (master of astrology), and later, he took over the title of Soke (head of the school) of Tenmondo (astrology) from Tadayuki's son, KAMO no Yasunori.
実際、安倍晴明は暦家・賀茂忠行の弟子であるが、天文得業生を経て陰陽師、果ては天文博士に昇進、後には忠行の子・賀茂保憲より天文道宗家を譲られている。