Heavenly Stems & Earthly Branches

The Heavenly Stems and Earthly Branches (Tiangan Dizhi) are among China's oldest symbolic systems, originating from the calendrical and sacrificial needs of high antiquity. The ten Heavenly Stems (Jia, Yi, Bing, Ding, Wu, Ji, Geng, Xin, Ren, Gui) and twelve Earthly Branches (Zi, Chou, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu, Hai) were first used to record days, and later expanded to years, months, and hours. This system is deeply rooted in the ancient observation of celestial movements and the cycles of all things, becoming the foundational framework for all later Chinese metaphysical arts. Its yin-yang attributes and five-element correspondences were gradually perfected over the long centuries.

Key Figures

Da Nao — traditionally said to be a historian during the Yellow Emperor's reign; according to the Shiben, he created the Heavenly Stems and Earthly Branches to establish the sexagenary cycle; Fu Xi — creator of the Eight Trigrams and establisher of the calendar, regarded as the founder of the Chinese civilizational symbolic system

Important Works

Shangshu · Yaodian — records early astronomical observations of the sun, moon, and stars, reflecting the astronomical origins of the stem-branch system; Shiben — a pre-Qin historical compilation preserving ancient legends about the origin of the stems and branches

Historical Significance

The Heavenly Stems and Earthly Branches provided the most fundamental temporal encoding system for metaphysics. All Bazi charting, spirit-noble calculations, and annual/luck-period projections rest upon this foundation. Without the stem-branch system, traditional Chinese numerology would lose its unified measurement language; its influence permeates three thousand years of metaphysical development.