Tai Yi Shen Shu: Supreme Oneness Divine Number (太乙神數)
Tai Yi Shen Shu (太乙神數) is one of the Three Styles (三式) of Chinese divination — alongside Da Liu Ren (大六壬) and Qi Men Dun Jia (奇門遁甲). Together, these three systems represent the highest level of classical Chinese divination art, with Tai Yi occupying the most macroscopic and state-level position of the three.
The Three Styles Compared
Tai Yi (太乙): Macroscopic and state-level — predicts large-scale events: wars, national disasters, epidemics, climate, political change. Used historically by court astronomers to advise emperors on the fate of the realm. Da Liu Ren (大六壬): Individual and timing-focused — the most complete system for individual divination questions with detailed timing information. Qi Men Dun Jia (奇門遁甲): Tactical and situational — developed for military strategy, now applied to business and decision timing. The analogy: Tai Yi shows the big picture (what is happening to the country), Da Liu Ren shows the human situation (what is happening to a person), and QMDJ shows tactical options (what action to take).
Historical Origins
Tai Yi is documented in the Sui Dynasty (隋朝, 581–618 CE) and was systematized in the Tang Dynasty. Classical sources include Tai Yi Shu (太乙術) and the Tang Dynasty manual Tai Yi Jin Jing Zhan (太乙金鏡占). The system was used by court astronomers alongside the Chinese imperial astronomical tradition.
The 144-Cycle System
Tai Yi operates on a 144-cycle system: 72 Yang Dun (陽遁, odd-numbered cycles) and 72 Yin Dun (陰遁, even-numbered cycles). Each cycle covers one year. A complete revolution covers 144 years — approximately two generations, reflecting the macroscopic time frame appropriate for national-level prediction.