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 5: Why Do Bing and Xin Combine into Water$8
The most perplexing cases are Bing-Xin forming Water and Wu-Gui forming Fire.
At first glance, Jia-Ji and Yi-Geng look like a strong component subduing a weak one—the stronger element subsumes the weaker. But Bing Fire (strong) combining with Xin Metal (also strong) produces Water, which in theory overcomes Fire.
Conjecture 1: Physical Metaphor Fire and frost—Bing as scorching sun, Xin as frost or metal coldness. When the sun melts frost, the result is water.
Conjecture 2: Alchemical Metaphor In Daoist alchemy, metal (Xin) melts under intense heat (Bing). The resulting liquid can be seen as water. Or in Yin-Yang organ theory, Bing Fire is Heart, Xin Metal is Lung; their interaction yields fluid (Body fluid).
Conjecture 3: Taiyin Water Cycle In Five Yun Six Qi, Bing-Xin governs Water qi. Astronomically, the gravitational pull during Bing-Xin years might stir up watery energy, leading to an abundance of water vapor.
Conjecture 4: Five Tiger Run Binding During Bing-Xin years, Bing enters Geng Yin, and March arrives at Ren Chen (Chen carries Ren Water). Hence transformation obeys the timing (Earthly Branch). The combination is the cause; the branch (Chen) is the catalyst. Without the right environment, Bing and Xin only cling—not transform. The Chen timing triggers them to metamorphose into Water.