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Heavenly Stem 07 of 10 · 天干

庚

Geng

gēng

Geng is the yang expression of the Metal phase. In a pillar it supplies phase and polarity; the Earthly Branch beside it supplies the animal and the twelve-position time coordinate.

Polarity
Yang
Phase partner
辛 Xin
An autumn mountain workshop among mineral cliffs, bronze vessels and maples
Autumn · WestThis landscape visualises the traditional seasonal and directional correspondences of Metal. Geng's yang position is supplied by the stem itself.

One sign, one fixed coordinate

What stays fixed for Geng

Wherever 庚 appears—year, month, day or hour—it remains Yang Metal. Its position in a chart changes; these identities and stem-to-stem partners do not.

Sequence position
7 of 10

After 己 Ji; before 辛 Xin.

Five Combination · 五合
乙 Yi

The reciprocal partner five positions away in the stem sequence.

Fixed clash
甲 Jia

The opposing stem named by the fixed reference table.

Six meetings in sixty positions

Every Geng pillar in the cycle

The ten stems and twelve branches advance together. 庚 therefore meets six branches before the sixty-position sequence returns to its opening pair.

  1. Position 07庚午Example year 1990
  2. Position 17庚辰Example year 2000
  3. Position 27庚寅Example year 2010
  4. Position 37庚子Example year 2020
  5. Position 47庚戌Example year 2030
  6. Position 57庚申Example year 2040

Inside the Earthly Branches · 藏干

Where 庚 is carried as a hidden stem

Branches contain one to three interior stems in a fixed order. 庚 appears inside 2 branches; its primary, middle or residual role stays attached to each occurrence.

  1. 01

    巳

    Snake · Si

    Fire branch

    middle

    The second stem in the branch’s interior order

  2. 02

    申

    Monkey · Shen

    Metal branch

    primary

    The branch’s principal interior stem

Open the complete hidden-stem map

When 庚 is the Day Master · 日主

How Geng names all ten stem relationships

As the day stem, 庚 becomes the comparison point. The target stem's phase selects one of five relationship pairs, then its polarity selects the named member of that pair.

  1. 01甲JiaYang WoodDay Master controls it · same polarity偏财Indirect Wealthpiān cái
  2. 02乙YiYin WoodDay Master controls it · different polarity正财Direct Wealthzhèng cái
  3. 03丙BingYang FireIt controls the Day Master · same polarity七杀Seven Killingsqī shā
  4. 04丁DingYin FireIt controls the Day Master · different polarity正官Direct Officerzhèng guān
  5. 05戊WuYang EarthIt generates the Day Master · same polarity偏印Indirect Resourcepiān yìn
  6. 06己JiYin EarthIt generates the Day Master · different polarity正印Direct Resourcezhèng yìn
  7. 07庚GengYang MetalSame phase · same polarity比肩Friendbǐ jiān
  8. 08辛XinYin MetalSame phase · different polarity劫财Rob Wealthjié cái
  9. 09壬RenYang WaterDay Master generates it · same polarity食神Eating Godshí shén
  10. 10癸GuiYin WaterDay Master generates it · different polarity伤官Hurting Officershāng guān
Read the complete Ten Gods rule