KAMO no Tadayuki was familiar with not just the art of Onmyo, but with various other subjects including the arts of astronomy, and calendar making as well as augury of renowned accuracy that legend has it that when Emperor Murakami had him perform augury on the contents of a box in which, unbeknownst to KAMO, a crystal rosary was hidden, he correctly guessed what was inside the box ('Choyagunsai' by MIYOSHI no Tameyasu).
陰陽道にかぎらず天文道・暦道など様々な分野に明るかったほか、卜占にもよく通じておりその正確さは有名で、村上天皇が水晶念珠を見えないように箱に入れてその中身を占じさせたところ、見事に言い当てたという伝説が残っている（三善為康「朝野群載」）。