Heavenly Stem Combinations: From Hetu-Luoshu to Astronomical Conjectures
Heavenly Stem Five Combinations are one of the most foundational yet enigmatic doctrines in Chinese metaphysics. This article takes readers through the math of Hetu, the astronomical correspondences, and various schools’ conjectures to show how the doctrine reflects a cosmic rhythm.
Chapter 4: Schools of Thought and Theoretical Models
Numerous schools have offered elegant conjectures beyond the mainstream.
1. Yin-Yang Companion Theory
The most accessible explanation. Jia is Yang Wood, upright and firm; Ji is Yin Earth, soft and accommodating. Wood restrains Earth in the same way a husband (Jia) restrains a wife (Ji). Yang wood overcomes Yin earth yet is held—together they produce the stable Earth image because Jia “roots” into Ji’s soil.
2. Misaligned Five Phase Origin Theory
This numerological theory posits the Five Combinations as a transition from innate (Xiantian) phases to acquired (Houtian) ones. Jia (1) and Ji (6) both relate to innate Water numbers, yet the combination jumps into a dynamic cycle that produces Earth. Some say the midpoint “six” symbolizes old Yin—the end of a cycle and the germ of a new beginning.
3. Na Yin Explanation
Another school traces clues from the Na Yin system, though critics argue this is circular since Na Yin itself derives from the Five Combinations.
4. Meteorological Conjecture: Five Yun Six Qi
Returning to the Huangdi Neijing, this theory sees the Five Combinations as a way to model climatological cycles. Years ruled by Jia/Ji imply Earth qi fluctuations—damp and heavy, or dry and gusty. Yi/Geng years imply Metal qi—dry and harsh.
This view frames the Five Combinations as an ancient statistical summary of climate cycles—possibly tied to sunspot cycles or longer-term atmospheric rhythms.