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Day Pillar 15 of 60 · Nayin City Wall Earth

Wu Yin (戊寅) Day Pillar — Yang Earth on the Tiger

The Wu Yin day pillar pairs the Wu day master (Yang Earth) 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戊 Wu · Yang Earth
Day branch寅 Yin (Tiger) · Wood
Hidden stems甲 Jia (Seven Killings, main qi); 丙 Bing (Indirect Resource, middle qi); 戊 Wu (Peer, residual)
Stage of the stem hereBirth (1 of 12)
NayinCity Wall Earth · 城头土 (shared with Ji Mao 己卯)
Seat relationBranch controls stem (jie jiao) — traditional term: 截脚

How Wu sits on Yin

The branch controls the stem: Wood bears down on Earth, so the Wu day master sits under pressure from its own base. The traditional name is 截脚 (jié jiǎo, "cutting the heel") — the seat pushes back against the self. Structurally this means the day master cannot take its own ground for granted; it is a pillar where the base tests the person, and the full chart shows what resources answer that test.

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Nayin: City Wall Earth

City Wall Earth (城头土): earth compacted into a wall — ground given a defensive shape. The theme is structure that protects what is inside it.

The spouse palace (day branch)

In the spouse palace this is an Influence (官杀) configuration: the classical reading treats the partner-side branch as a source of structure, accountability, or pressure on the Wu day master. The structural point — stated by the tradition, not by this site — is that intimacy here comes with terms attached. Whether those terms read as support or as strain depends on the other seven characters, which is why this page stops at structure.

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

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 Wu Yin (戊寅) day pillar?
The Wu Yin day pillar pairs the Wu stem (Yang Earth) with the Yin branch (Wood). Its computed facts: hidden stems Jia (Seven Killings), Bing (Indirect Resource), Wu (Peer), the Wu stem at the Birth stage on this branch, seat relation "undefined", and nayin City Wall Earth (城头土).
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 Wu Yin day pillar good or bad?
Neither, on its own. The seat relation (undefined) and the Birth 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 City Wall Earth mean?
Nayin (城头土) is a two-thousand-year-old classification that gives each PAIR of pillars a symbolic element-image — for Wu Yin it is "City Wall Earth", shared with its partner pillar Ji Mao (己卯). 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 (Wu):

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

Ding Chou ←  ·  → Ji 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.