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bazi-skill-chinese-astrology

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Updated 10-13 20:10

About this skill

BaZi Skill — 四柱八字命理分析

Skill by ara.so — Daily 2026 Skills collection.

A Claude Code skill for interactive BaZi (Four Pillars of Destiny) chart calculation and analysis, referencing nine classical Chinese astrology texts. Guides users through birth information collection, produces a complete 四柱 chart, and delivers professional destiny analysis.

What This Skill Does

  • Interactive information collection — step-by-step prompts for name, birth date (solar/lunar), birth hour (时辰), gender, and birthplace
  • Chart calculation — derives Year/Month/Day/Hour pillars (年柱/月柱/日柱/时柱), calculates 大运 (major cycles) and 流年 (annual cycles)
  • Comprehensive analysis — day master strength (日主强弱), ten gods (十神), five elements balance (五行), pattern determination (格局), career, relationships, health guidance
  • Classical text references — cross-references nine canonical texts including 《穷通宝典》, 《滴天髓》, 《子平真诠》, and more

Installation

# Install to current git project (run from repo root)
mkdir -p .claude/skills
git clone https://github.com/jinchenma94/bazi-skill .claude/skills/bazi
Install globally (available in all projects)

git clone https://github.com/jinchenma94/bazi-skill ~/.claude/skills/bazi


After installation, Claude Code automatically discovers the skill from `.claude/skills/bazi/SKILL.md` or `~/.claude/skills/bazi/SKILL.md`.

## Project Structure

bazi-skill/ ├── SKILL.md # Skill entry point (this file) ├── references/ │ ├── wuxing-tables.md # Five elements, heavenly stems, earthly branches, ten gods │ ├── shichen-table.md # Time period conversion table, daily time calculation │ ├── dayun-rules.md # Major cycle forward/reverse rules, starting age calculation │ └── classical-texts.md # Core rules from nine classical texts ├── LICENSE └── README.md


## Triggering the Skill

Type any of these in Claude Code to activate:

算八字 看八字 批八字 排八字 四柱 命盘 算命 排盘 bazi


## Step-by-Step Workflow

When triggered, follow this exact sequence:

### Step 1: Collect Birth Information

Ask the user for these fields **one at a time** (do not ask all at once):
  1. 姓名 (Name) — optional, for personalization
  2. 性别 (Gender) — 男/女, affects 大运 direction
  3. 出生日期 (Birth date) — ask whether 阳历 (solar) or 农历 (lunar)
  4. 出生时辰 (Birth hour) — see shichen-table.md for conversion
  5. 出生地点 (Birthplace) — province/city for timezone adjustment

### Step 2: Convert to Four Pillars

Reference `references/wuxing-tables.md` for all lookup tables.

**Year Pillar (年柱):**

Year stem index = (year - 4) mod 10 → maps to 天干 Year branch index = (year - 4) mod 12 → maps to 地支


**Month Pillar (月柱):**

Month branch is fixed by solar term (节气), not calendar month. Month stem is derived from year stem using the 五虎遁年起月法 table.


**Day Pillar (日柱):**

Use pre-calculated 万年历 (perpetual calendar) lookup. Day stem/branch cycle repeats every 60 days (六十甲子).


**Hour Pillar (时柱):**

Convert clock time → 时辰 (see shichen-table.md) Hour stem derived from day stem using 五鼠遁日起时法 table.


### Step 3: Identify Day Master (日主)

The Day Pillar's Heavenly Stem is the Day Master — the central reference point for all analysis.

Example: 日柱 = 甲子 Day Master = 甲 (Wood, Yang)


### Step 4: Calculate 大运 (Major Cycles)

Reference `references/dayun-rules.md`:

Male + Yang year stem → Forward (顺排) Male + Yin year stem → Reverse (逆排) Female + Yang year stem → Reverse (逆排) Female + Yin year stem → Forward (顺排)

Starting age = days to next/previous 节气 ÷ 3 (round to nearest integer) Each 大运 lasts 10 years.


### Step 5: Determine Ten Gods (十神)

Cross-reference Day Master against each pillar stem using the 十神 table in `references/wuxing-tables.md`:

| Relationship | Same element, same polarity | Same element, opposite polarity |
|---|---|---|
| Self | 比肩 | 劫财 |
| Element I produce | 食神 | 伤官 |
| Element that produces me | 正印 | 偏印 |
| Element I control | 正财 | 偏财 |
| Element that controls me | 正官 | 七杀 |

### Step 6: Assess Five Elements Balance (五行平衡)

Count Wood/Fire/Earth/Metal/Water across all 8 characters (stems + branches). Note hidden stems (藏干) in branches — include these in element count. Identify excess and deficiency.


### Step 7: Determine Pattern (格局)

Reference `references/classical-texts.md` — 《子平真诠》 and 《三命通会》 sections:

普通格局 (Common patterns): 正官格, 七杀格, 正印格, 偏印格, 食神格, 伤官格, 正财格, 偏财格 特殊格局 (Special patterns): 从格, 化格, 专旺格, etc.

Month branch hidden stem often determines the primary pattern.


### Step 8: Full Analysis Output

Structure your analysis report as follows:

```markdown
## 八字命盘 | BaZi Chart

**姓名**: [Name]  **性别**: [Gender]  **出生**: [Date Time]

| 柱  | 天干 | 地支 |
|-----|------|------|
| 年柱 | X   | X   |
| 月柱 | X   | X   |
| 日柱 | X   | X   |
| 时柱 | X   | X   |

**日主**: X（X行，X）

---

## 大运排列

起运年龄: X岁（约 XXXX 年起）

| 序 | 大运 | 年份 | 十神 |
|----|------|------|------|
| 1  | XX  | XXXX–XXXX | XX |
...

---

## 命理分析

### 日主强弱
[Assessment of day master strength based on seasonal support, roots, and helpers]

### 五行分析
[Element count and balance assessment]

### 格局判定
[Pattern name and explanation, citing classical text]

### 十神解读
[Key ten god relationships and their implications]

### 大运流年
[Current and upcoming major/annual cycle analysis]

### 综合建议
**事业**: [Career guidance]
**感情**: [Relationship guidance]  
**健康**: [Health guidance]
**择吉**: [Auspicious timing suggestions]

---
*参考典籍: 《穷通宝典》《三命通会》《滴天髓》《渊海子平》《千里命稿》*
*免责声明: 仅供传统文化学习与娱乐参考，不构成任何决策依据。*

Key Reference Tables

天干 Heavenly Stems

甲(Wood+) 乙(Wood-) 丙(Fire+) 丁(Fire-) 戊(Earth+)
己(Earth-) 庚(Metal+) 辛(Metal-) 壬(Water+) 癸(Water-)

地支 Earthly Branches

子(Water+/Rat)  丑(Earth-/Ox)   寅(Wood+/Tiger) 卯(Wood-/Rabbit)
辰(Earth+/Dragon) 巳(Fire-/Snake) 午(Fire+/Horse) 未(Earth-/Goat)
申(Metal+/Monkey) 酉(Metal-/Rooster) 戌(Earth+/Dog) 亥(Water-/Pig)

五虎遁年起月法 (Month Stem from Year Stem)

Year stem 甲/己 → January stem starts at 丙
Year stem 乙/庚 → January stem starts at 戊
Year stem 丙/辛 → January stem starts at 庚
Year stem 丁/壬 → January stem starts at 壬
Year stem 戊/癸 → January stem starts at 甲

五鼠遁日起时法 (Hour Stem from Day Stem)

Day stem 甲/己 → 子时 stem = 甲
Day stem 乙/庚 → 子时 stem = 丙
Day stem 丙/辛 → 子时 stem = 戊
Day stem 丁/壬 → 子时 stem = 庚
Day stem 戊/癸 → 子时 stem = 壬

Classical Texts Quick Reference

典籍 Primary Use
《穷通宝典》 Day master seasonal adjustment (调候)
《三命通会》 Pattern and spirit star (格局神煞) analysis
《滴天髓》 Five element strength and flow (五行旺衰)
Yuanhai Ziping Ten gods and six relations (十神六亲)
Qianli Minggao Case study verification (命例实证)
Xieji Bianfang Shu Auspicious date selection (择日神煞)
Guolao Xingzong Star and fate combined reading (星命合参)
Ziping Zhenquan Use god and pattern (用神格局)
Shenfeng Tongkao Correcting common errors (命理辨误)

Full excerpts and rules are in references/classical-texts.md.

Common Patterns & Troubleshooting

Lunar to Solar Date Conversion

  • Always confirm whether user provides 阳历 (Gregorian) or 农历 (lunar)
  • Use 万年历 lookup for lunar→solar conversion before calculating pillars
  • Intercalary months (闰月) require special handling

Solar Term (节气) Boundaries

  • Month pillar changes at 节 (first solar term of month), NOT at month start
  • Critical for people born near the 1st–8th of a month
  • When uncertain, inform user their month pillar may differ by one month

Timezone Adjustment

  • Standard Chinese charts use Beijing time (UTC+8)
  • Users born outside China: convert local birth time to Beijing time
  • Some practitioners use true solar time (真太阳时) — note if applying this

Day Master Strength Assessment Checklist

✓ Is the birth season supportive? (得令)
✓ Does the day branch support the day master? (得地)  
✓ Do other stems help the day master? (得助)
Strong (身强) if 2+ conditions met; Weak (身弱) if 0–1 conditions met.

Missing Information Handling

  • If user cannot provide exact birth time: analyze without hour pillar, note limitation
  • If only year/month known: provide partial analysis with appropriate caveats
  • Never fabricate birth data — always ask for clarification

Example Interaction

User: 帮我算八字

Claude: 好的，我来为您排八字！请问您的性别是？

User: 女

Claude: 好的。请问您的出生日期是阳历还是农历？

User: 阳历，1990年3月15日

Claude: 明白了。请问您出生的时辰或具体时间？

User: 早上8点半

Claude: 早上8点半是辰时（07:00–09:00）。请问出生地点？

User: 上海

Claude: [Proceeds to calculate pillars, 大运, and full analysis]

Disclaimer

This Skill is for traditional culture learning and entertainment reference only; the analysis results do not constitute any basis for medical, legal, financial, or major life decisions. Fate calculation belongs to the scope of traditional culture; please view it rationally.