BaZi · Glossary
Wu Hu Dun — Month Stem from Year Stem
Deep Oracle Editorial Team · 2026-07-27 · 1 min read
The rule fixing the first month's stem from the year stem so the month pillar can be built, named for the tiger because the first month is the 寅 month.
Reference table
| Year stem | First month (寅) stem |
|---|---|
| 甲 | 丙寅 |
| 乙 | 戊寅 |
| 丙 | 庚寅 |
| 丁 | 壬寅 |
| 戊 | 甲寅 |
| 己 | 丙寅 |
| 庚 | 戊寅 |
| 辛 | 庚寅 |
| 壬 | 壬寅 |
| 癸 | 甲寅 |
Related terms
In the classical texts
Passages in the classical texts held on this site where the term occurs, transcribed from the named edition. The texts do not necessarily use the term the way it is used today.
有天马贵神乃岁中不见驿五虎遁至马上看得何干其干见天乙而天乙所坐之干却复见贵于马上是也贵不下三品
八卦诸身定间爻歌年上起月法
起六神法五虎遁法五鼠遁法
二十四、年上起月歌
（以五虎遁，正月甲遁觅丁神，得丁卯丁丑，故正月以丁卯为天医，余丁丑；
果老有天马、地驿，起例不同，以五虎遁官禄宫，取二者姑并详之，惟果老者为切。
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