Overview of the Ten Heavenly Stems (十天干)
Learn the fixed sequence, polarity, phase, seasonal context, roots, and interaction rules used to read the Ten Heavenly Stems in Bazi.
Overview
The Ten Heavenly Stems are Jia, Yi, Bing, Ding, Wu, Ji, Geng, Xin, Ren, and Gui. Each has a fixed yin-yang polarity and Five-Element phase, but its role in a Bazi chart depends on pillar position, month command, branch roots, exposure, combinations, control, and timing. The stems are a symbolic coordinate system, not ten fixed personality types.
At a glance
- Sequence
- Jia, Yi, Bing, Ding, Wu, Ji, Geng, Xin, Ren, Gui
- Polarity pattern
- Yang and yin alternate in fixed order
- Phase pairs
- Two stems for each of the Five Elements
- Visible layer
- One stem appears above each pillar
- Strength evidence
- Month command, roots, support, control, and position
- Boundary
- A stem name is not a complete personality verdict
The ten stems are fixed chart coordinates
The canonical order begins with Jia and Yi Wood, continues through Fire, Earth, Metal, and Water, and returns to Wood after Gui.
A chart records one stem in each pillar. The symbol keeps its identity even when later interactions change how effectively it can act.
- Preserve sequence, polarity, and phase.
- Keep original symbols visible after interpretation.
Context determines how a stem functions
Month command establishes the seasonal environment, while branch roots show whether the visible stem has support below the surface.
Pillar position, distance, generation, control, combination, and competing forces can strengthen, redirect, bind, or exhaust its function.
- Evaluate season before isolated imagery.
- Trace support and obstruction separately.
Read identity, support, relation, then timing
First identify the stem and its relation to the Day Stem, then check roots and seasonal support before testing interactions.
Luck pillars and annual influences form a later layer. They can activate an existing relation but do not rewrite the natal chart.
- Separate natal and timing evidence.
- State the rule behind every claimed interaction.
Ten labels cannot define ten kinds of people
A Jia Day Stem does not guarantee leadership, and a Gui Day Stem does not guarantee sensitivity. Classical images are prompts for contextual reading, not diagnoses.
The stems cannot establish health, morality, gender, profession, wealth, or future events without direct evidence outside the symbolic model.
- Avoid deterministic personality labels.
- Do not use stem imagery for high-stakes decisions.
Sources and editorial basis
- Taiwan Ministry of Education Dictionary: 天干教育部辭典「天干」：甲乙丙丁戊己庚辛壬癸的名稱、順序與干支紀序用途Taiwan’s official dictionary definition and canonical listing of the ten stems.
- 《御定星曆考原》卷一《星曆考原》卷一天干五行：十干陰陽、五行及四時配屬的固定對照A historical source for stem and branch Yin-Yang, Five Phase, direction, seasonal, and calendrical correspondences.
- OpenFate Editorial Methodology十天干總覽以固定分類、月令根氣、關係網絡和歲運分層，禁止以單干定人格或事件OpenFate separates deterministic chart calculation, traditional interpretation, and modern editorial explanation.