Senji ryakketsu (the oldest existing book on yin-yan) in the material "Nihon Onmyodo-shi Sosetsu" (Japanese yin-yan history review paper) written by Shuichi MURAYAMA contains a name with a wrong letter.
村山修一著『日本陰陽道史総説』所載の占事略决では「勝光」を「勝先」としているが「勝光」が正しい。