Prelude: The Grand Numbers of Heaven and Earth and the Origins of Conjunction and Transformation

The Pivot of Terrestrial Order: A Study of the Six Conjunctions and Qi Transformations of the Twelve Earthly Branches in High Antiquity

This essay strips away the veneer of divinatory numerology to return to pre-Qin astronomy and cosmology, offering a rigorous investigation of the true nature of the Six Conjunctions of the Twelve Earthly Branches — Zi-Chou, Yin-Hai, Mao-Xu, Chen-You, and the rest. It focuses on the astronomical 'conjugation' essence of the Six Conjunctions, and the philosophical implications — sealing and storing, sprouting and rising, refining and transforming, revolution and change — concealed behind their 'qi transformations.'

Xuanji Editorial Board January 30, 2026 12 min read PDF Markdown

This article was translated from the original Chinese by AI. Nuances may differ from the source.

In the eyes of the ancients of high antiquity, time was not an abstract number but rather the circulation of vital breath (qi), the procession of spirits and luminaries. The Twelve Earthly Branches — Zi, Chou, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu, Hai — already appear in rudimentary form in oracle bone inscriptions. Their essence lies in the ancient calibration of the orbital path of Jupiter (the Year Star, suixing), and in the profound insight into the relationship between the Sun's apparent annual motion and the direction pointed by the Northern Dipper.

What is meant by "conjunction" (he) is not a trivial human coupling, but the point of intersection where "the Way of Heaven revolves leftward and the Way of Earth revolves rightward." What is meant by "transformation" (hua) is the qualitative transmutation produced when the two breaths of Yin and Yang converge at a specific junction of time and space.

The Guanzi, chapter "Techniques of the Heart" (Xinshu), states: "That which nurtures and transforms the myriad things is the Dao." The conjunctions and transformations of the Earthly Branches are, in truth, a microcosmic model simulating cosmic genesis and the rotation of qi and fortune. Why are there "Six Conjunctions"$1 The Huainanzi, chapter "Patterns of Heaven" (Tianwenxun), provides the most original astronomical explanation: "The Monthly General (yuejian) conjoins with the Monthly Establishment (yuejiang)."

The Monthly Establishment is the direction (Earthly Branch) to which the handle of the Northern Dipper points; the Monthly General is the position of the Sun along the twelve stations of the ecliptic (corresponding to the Earthly Branches but in the opposite direction).

When the Dipper handle points to Zi (the eleventh lunar month), the Sun lodges in the mansion of Chou — hence the conjunction of Zi and Chou.
When the Dipper handle points to Yin (the first lunar month), the Sun lodges in the mansion of Hai — hence the conjunction of Yin and Hai.
And so forth: the Six Conjunctions are the conjugation of Heaven (the Sun) and Earth (the direction of the Dipper handle).

This essay takes this foundation as its cornerstone and proceeds to analyze, one by one, the esoteric meaning behind the conjunction and transformation of each of the six pairs.