Jin Dynasty numerology became increasingly sophisticated, with clear records of predicting fortune through the relationship between "year" and "fate."
According to the Book of Jin, the diviner Dai Yang accurately predicted the death of Liu Yin, defender of Xunyang. At forty-seven, Liu Yin's annual cycle had just entered Gengyin. Citing the Taigong Yinmou, Dai Yang declared: "The six Geng represent the White Beast... what lies below is harmful qi."
He warned Liu Yin: "When year aligns with fate, misfortune is certain," specifying: "On the twenty-second day of the twelfth month, a Gengyin day, receive no visitors." Liu Yin was killed in the fifth year of Xianhe (330 CE). This demonstrates that refined predictions using natal year, annual cycles, and daily Ganzhi relationships were already in practice—a significant advance in technique.
