Chapter Three: The Conjunction of Mao and Xu — Burning the Forest to Hunt and the Fire of the Bi Lunar Lodge

I. Astronomical and Etymological Investigation

Mao corresponds to the second month establishment. It resembles the form of an opening gate. The Shuowen states: "Mao means 'to sprout forth' (mao). In the second month, the myriad things burst through the ground and emerge."

Xu corresponds to the ninth month general. It resembles a person holding a halberd on guard. The Shuowen states: "Xu means 'to extinguish' (mie). In the ninth month, Yang breath is faint, the myriad things have reached completion, and Yang descends into the earth."

Question: This is the most enigmatic pair among the Six Conjunctions. Mao is pure Wood; Xu is dry Earth. Wood controls Earth — how can they conjoin$7 More astonishing still, together they transform into "Fire"! Whence comes the Fire$8

II. In-Depth Analysis from the Perspective of High Antiquity

To unlock the age-old mystery of "Mao-Xu transforming into Fire," one must return to pre-Qin stellar lodge culture and sacrificial practice.

1. The Decline and Concealment of the Great Fire Star:
   • The pre-Qin placed great importance on the "Great Fire Star" (the Heart Lunar Lodge, Antares). In the month of Xu (the ninth month), the Great Fire Star sinks below the northwestern horizon — yet this does not mean Fire is extinguished but rather that it has "entered its tomb." Xu is the storehouse of Fire.
   • Mao occupies the eastern Zhen (Arousing) Palace, the position of Thunder. The Zhouyi (Book of Changes), Shuogua Zhuan (Discussion of the Trigrams), states: "Zhen is thunder, is the dragon, is the dark and yellow."
2. The Mechanism of Fire-Transformation — Thunder-Fire Tempering the Hall:
   • The Friction of Wood and Earth: On the physical plane, this is the drilling of wood to kindle fire. Mao (Wood) drills into Xu (dry Earth); violent friction gives rise to the breath of Fire.
   • The Countercurrent between the Gate of Heaven and the Gate of the Sun:
     • Mao is the gate of sunrise; Xu is the gate of sunset.
     • When the Dipper handle points to Mao (the Vernal Equinox), the Sun is in Xu (near the Autumnal Equinox point).
     • This is the linkage of Spring and Autumn. The breath of spring Wood (rising and sprouting) encounters the dryness of autumn Earth (gathering and collecting).
     • This violent contrast of atmospheric force — the generative and the lethal — was seen by the ancients as producing an intensely hot energy. "The quintessence of Yang breath, exchanged between the two, engenders Fire."
   • Following the logic of the Huainanzi: Mao is Lesser Yang; Xu is the storehouse of Fire. When the breath of Lesser Yang enters the storehouse of Fire, it is as fuel cast into a furnace — the conflagration is assured.
3. Historical Metaphor:
   • This is a case of "merciless conjunction" becoming "ardent transformation."
   • In the Sunbin Bingfa (Sun Bin's Art of War), this combination frequently serves as a metaphor for "burning the enemy's grain stores" or "fighting with one's back to the river." Mao-Wood sacrifices itself (Wood engenders Fire), Xu-Earth opens its breast, and what results is a conflagration that fills the sky.

Conclusion The conjunction of Mao and Xu transforming into Fire is the "Fire of the Prairie Blaze" — and also the "Fire of Civilization." It represents the process of sacrificing material substance (Wood and Earth) to transmute into pure energy (Fire). This is sublimation — an esoteric mystery beyond the alchemists' "Wood-Liquor and Metal-Essence."