"Senji ryakketsu" (or "Senji ryakuketsu") is the oldest existent book of Onmyodo (way of Yin and Yang; an occult divination system based on the Taoist theory of the five elements) which is believed to have been compiled by Onmyoji (Master of Yin yang) ABE no Seimei in the Heian period.
占事略决(せんじりゃっけつ、せんじりゃくけつ)は、平安時代の陰陽師・安倍晴明が撰したとされる、現存最古の陰陽道に関する書物である。