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Heavenly Stem · Metal

Geng Metal (庚) in Bazi

Geng Metal (庚) is stem 7 of ten, classified as Yang Metal. Learn its sequence, pair, chart role, traditional correspondences, and reading limits.

Chinese
庚
Pinyin
Gēng
Also known as
Geng · Yang Metal

Editorially reviewed:

Overview

Geng Metal (庚) is the Yang member of the Metal stem pair. It is a chart symbol, not a fixed personality label, and must be read with season, roots, pillar position, relationships, and timing.

At a glance

Character and reading
庚 · Gēng
Sequence position
7 of 10
Polarity
Yang
Five Phase
Metal
Same-phase pair
Xin Metal (辛)
Traditional correspondence
West · Autumn
Stem combination
Yi Wood (乙) → Metal, only when transformation conditions are met

Definition and place in the cycle

Geng is seventh in the cycle and opens the Metal pair before Xin.

Geng Metal (庚) and Xin Metal (辛) share the Metal phase and differ by Yin-Yang polarity. That classification does not, by itself, establish temperament, strength, or outcome.

How it appears in a Four Pillars chart

A Four Pillars chart displays one Heavenly Stem above each Year, Month, Day, and Hour Branch. When 庚 occupies the Day Stem, it is the Day Master; in any other pillar, it is interpreted in relation to the Day Master.

Check the month-command season, roots in Earthly Branches, support and control, combinations, pillar position, and active timing before deciding how 庚 functions. Presence, strength, and usefulness are separate questions.

Traditional correspondences and stem combination

Traditional correspondence systems place the Metal pair with West and autumn. These are inherited classification relationships, not physical properties or stand-alone predictions.

Geng Metal (庚) is traditionally paired with Yi Wood (乙), with Metal named as the conventional transformation result. In Bazi, seeing both stems is not proof of transformation; the complete chart must support it.

Common reading errors

Use Geng Metal (庚) as one piece of a relational chart, not as a shortcut for identity or fortune.

  • Do not turn 庚 into a fixed personality type.
  • Do not treat Yang and Yin as better and worse, or automatically stronger and weaker.
  • Do not assume that a visible combination has transformed or that one symbol decides the whole chart.

Sources and editorial basis

  1. Hong Kong Observatory: Heavenly Stems and Earthly Branches
    An official modern reference for the canonical stem and branch orders, the sexagenary cycle, and calendrical use.
  2. 《御定星曆考原》卷一
    A historical source for stem and branch Yin-Yang, Five Phase, direction, seasonal, and calendrical correspondences.
  3. 《圖書編》卷二十三
    A historical source listing the five stem pairings and their conventional transformation phases.
  4. 《子平真詮》 (True Explanations of Ziping)
    A major reference for month-command, structure, and contextual Bazi interpretation.
  5. OpenFate Editorial Methodology
    OpenFate separates deterministic chart calculation, traditional interpretation, and modern editorial explanation.
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