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Day Pillar 27 of 60 · Nayin Pine and Cypress Wood

Geng Yin (庚寅) Day Pillar — Yang Metal on the Tiger

The Geng Yin day pillar pairs the Geng day master (Yang Metal) with the Yin branch (Wood, the Tiger). Below: the computed facts, what the seat relation and twelve-stage position mean structurally, the nayin gloss, the classical reading of the spouse palace, and an instant lookup for your own pillar.

Computed facts (engine-verified)

This page is generated from the engine, not hand-written; structural facts reconcile against the methodology page.

Day master庚 Geng · Yang Metal
Day branch寅 Yin (Tiger) · Wood
Hidden stems甲 Jia (Indirect Wealth, main qi); 丙 Bing (Seven Killings, middle qi); 戊 Wu (Indirect Resource, residual)
Stage of the stem hereExtinction (10 of 12)
NayinPine and Cypress Wood · 松柏木 (shared with Xin Mao 辛卯)
Seat relationStem controls branch (gai tou) — traditional term: 盖头

How Geng sits on Yin

The stem controls the branch: Metal governs Wood, so the Geng day master sits on ground it actively manages. The traditional name is 盖头 (gài tóu, "covering the head") — the stem holds the upper hand over its own seat. Structurally, the day master's authority extends downward into the branch; how that authority is exercised (wisely or abrasively) depends on the other seven characters.

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Nayin: Pine and Cypress Wood

Pine and Cypress Wood (松柏木): pine and cypress — wood that keeps its color through winter. Endurance in hostile seasons is the theme.

The spouse palace (day branch)

In the spouse palace this is a Wealth (财) configuration: the classical reading treats the partner-side branch as something the Geng day master engages and manages. The structural point — stated by the tradition, not by this site — is that closeness here tends to be practical and hands-on. Whether that plays out as partnership or as logistics depends on the full chart, which is why this page makes no claim about any actual marriage.

The main qi 甲 (Jia, Indirect Wealth) defines the palace's classical group: Wealth. Middle/residual tenants: Bing (Seven Killings), Wu (Indirect Resource).

A note on what this page deliberately does not do: the internet is full of "60 personality types" tables that assign a fixed character to each day pillar. This site rejects that framing. A day pillar is a structural position — who sits where, on what kind of ground, with which hidden tenants. The same pillar reads differently under a different month command, and no meaningful judgement exists without the other six characters. Where the tradition offers a reading, it is labelled as the tradition's; this site's own contribution is that every number and term on this page is computed, versioned, and checkable against the methodology page.

Find your own day pillar

Birth date alone is enough — the day pillar never needs a birth time. The calculation runs in your browser; nothing is sent anywhere.

Frequently asked

What is the Geng Yin (庚寅) day pillar?
The Geng Yin day pillar pairs the Geng stem (Yang Metal) with the Yin branch (Wood). Its computed facts: hidden stems Jia (Indirect Wealth), Bing (Seven Killings), Wu (Indirect Resource), the Geng stem at the Extinction stage on this branch, seat relation "undefined", and nayin Pine and Cypress Wood (松柏木).
How do I find my own day pillar?
Use the calculator on this page (birth date is enough — the day pillar does not need a birth time) or the full chart calculator. Your day pillar is the third pillar of the four; each of the sixty has its own page on this site with the same computed structure.
Is the Geng Yin day pillar good or bad?
Neither, on its own. The seat relation (undefined) and the Extinction stage describe position and flow, not fortune. A meaningful reading needs the month command and the other six characters — any source that grades pillars as lucky or unlucky is simplifying past what the system itself claims.
What does the nayin Pine and Cypress Wood mean?
Nayin (松柏木) is a two-thousand-year-old classification that gives each PAIR of pillars a symbolic element-image — for Geng Yin it is "Pine and Cypress Wood", shared with its partner pillar Xin Mao (辛卯). It is a classical gloss layer, published here alongside the structural facts, never instead of them.

Nearby pillars

The other five pillars sharing this day master (Geng):

Geng Wu · Geng Chen · Geng Zi · Geng Xu · Geng Shen

Ji Chou ←  ·  → Xin Mao

Reference index

Every enumerable component of ba zi has its own page here. Each page is computed by the same engine and can be checked item by item — none of it is a personality table.