The Geng Yin day pillar (庚寅 gēng yín) sets Gēng 庚 (Yang Metal) on the branch of the Tiger, which is Wood at its most forceful and green. In a Ba Zi (八字 bāzì) chart the day pillar is where you live: the stem is your Day Master (日主 rìzhǔ), and the branch is the terrain it stands on. Here a blade of hard Metal sits directly over a growing tree — the axe over the forest. Because Metal controls Wood, the Day Master is standing on exactly what it is built to cut, which makes this one of the more energetic, appetite-driven pillars in the cycle.
Gēng is unrefined ore, the sword and the cleaver before polishing. The Tiger is initiative, movement, the start of spring. Put together, Geng Yin reads as raw capability aimed at something it wants to shape.
Personality
Geng Yin sits on Indirect Wealth (偏财 piāncái), because the Tiger’s main hidden qi is Jiǎ Wood, which for Yang Metal reads as Wealth. This is the signature of the pillar: a person who instinctively sees opportunity, value and the deal in front of them. Indirect Wealth is the flexible, roving kind of money-sense — the entrepreneur’s eye rather than the salaried saver’s.
Where Geng Metal on its own can be blunt and duty-bound, sitting on Wealth loosens it. These people tend to be generous, sociable, quick to spend on experiences and quick to chase a promising lead. There is a restlessness to Geng Yin; the Metal wants to act and the ground beneath it is full of things worth acting on.
The classic caution is that Wealth this readily available can scatter the focus. A well-supported Geng Yin turns opportunity into structure; an overstretched one grabs at too many trees to fell at once. The strength of the surrounding chart decides which it is.
The spouse palace
The day branch is the spouse palace (夫妻宫 fūqīgōng). The Tiger 寅 holds three hidden stems: Jiǎ 甲 (Yang Wood) = Indirect Wealth 偏财; Bǐng 丙 (Yang Fire) = Seven Killings 七杀; Wù 戊 (Yang Earth) = Indirect Resource 偏印.
| Hidden stem | Ten God (relative to Gēng) |
|---|---|
| Jiǎ 甲 (Yang Wood) | Indirect Wealth (偏财 piāncái) |
| Bǐng 丙 (Yang Fire) | Seven Killings (七杀 qīshā) |
| Wù 戊 (Yang Earth) | Indirect Resource (偏印 piānyìn) |
This is a vivid, layered palace. The Indirect Wealth as main qi puts money, opportunity and — in a male chart — a lively, resourceful partner at the centre. The Seven Killings (七杀 qīshā) adds intensity and pressure: passion, drive, sometimes friction that has to be managed rather than avoided. The Indirect Resource brings a quieter, protective, thoughtful undertone beneath the heat.
Classically this reads as a marriage that runs warm and stimulating rather than placid. It rewards partners who can handle directness and share ambition. None of it is a verdict — a Seven Killings in the palace simply asks that the intensity be pointed at shared goals, not at each other. For the fuller method — how much the palace weighs against the spouse star, and what to do when they disagree — see our guide to the spouse palace.
The Tiger’s active years
Yín is clashed by Shēn 申 (the Monkey) in the Six Clashes (六冲 liùchōng) — and for Geng Yin the Monkey is also the Day Master’s own root, so Monkey years pit the native’s element against the seat itself: classically a time to slow decisions around money and marriage rather than force them. Yín combines with Hài 亥 (the Pig) toward Wood in the Six Combinations (六合 liùhé), enriching the Wealth, and joins Wǔ 午 and Xū 戌 in the Fire frame (三合 sānhé), which fans the Seven Killings hidden in the seat into open pressure. Pig years feed this pillar’s appetite; Horse and Dog years raise its stakes.
Na Yin
The Na Yin (纳音 nàyīn) of Geng Yin is 松柏木 Sōngbǎi Mù, Pine and Cypress Wood. It is a fitting image: the evergreen that keeps its needles through winter, hard-grained and long-lived. A blade of a pillar carries the melodic soul of the tree that outlasts the cold — enduring, upright, slow to rot. Read it as poetic colour layered over the element mechanics, not as a substitute for them.
In a full chart
One pillar is not the whole story. Geng Yin gives you a temperament and a marriage axis, but whether that eager, Wealth-chasing Metal thrives depends on the rest of the board. Yang Metal standing on Wood with Fire hidden beneath is being both fed opportunity and pressured by heat; it usually wants Earth to resource it and companions to help it carry the load. Weighing that balance is the job covered in our note on the strong versus weak Day Master.
For the stem in full, see the Geng Metal Day Master profile, and for the complete list of how each stem reads against Gēng, the ten gods of the Geng Metal Day Master table. It is worth comparing siblings: Geng Zi shows the same Metal cooled by Water instead of standing on Wood, Geng Shen is the rooted Monkey seat that clashes this very Tiger, and Xin Mao is the yin-Metal version of the same Metal-over-Wood, Wealth-sitting idea.
Quick answers
Is Geng Yin good for business?
The instincts are there — Indirect Wealth under a decisive stem is the entrepreneur’s signature. Sustained results depend on support: Earth and companion Metal keep the axe swinging past the first tree.
What kind of marriage does this pillar suggest?
Warm, stimulating, ambitious — a partner with life in them, per the Wealth-and-Killings mix. It rewards directness and shared projects, and asks that intensity face outward.
Which years put this pillar in play?
Monkey years clash the seat; Pig years combine with it; Horse and Dog years complete its Fire frame. Treat them as the pillar’s scheduled seasons, not as omens.
Think the Geng Yin day pillar might be yours? Cast your four pillars free with the Butcher Boy calculator and check whether this is your day pillar before drawing any conclusions from it.