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Day Pillar 26 of 60 · Nayin Thunderbolt Fire

Ji Chou (己丑) Day Pillar — Yin Earth on the Ox

The Ji Chou day pillar pairs the Ji day master (Yin Earth) with the Chou branch (Earth, the Ox). 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己 Ji · Yin Earth
Day branch丑 Chou (Ox) · Earth
Hidden stems己 Ji (Peer, main qi); 癸 Gui (Indirect Wealth, middle qi); 辛 Xin (Eating God, residual)
Stage of the stem hereTomb (9 of 12)
NayinThunderbolt Fire · 霹雳火 (shared with Wu Zi 戊子)
Seat relationSame element (bi he) — traditional term: 比和

How Ji sits on Chou

Stem and branch share one element: Earth over Earth, so the Ji day master is seated on its own kind — a genuine root. The traditional name is 比和 (bǐ hé, "same kind"). Of all sixty pillars this arrangement gives the day master the most unambiguous footing: the base and the self speak the same element, for better or worse, and the rest of the chart decides which.

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Nayin: Thunderbolt Fire

Thunderbolt Fire (霹雳火): lightning — sudden, illuminating, impossible to schedule. The classical reading pairs it with breakthrough moments.

The spouse palace (day branch)

In the spouse palace this is a Peers (比劫) configuration: the classical reading treats the partner-side branch as the same element as the Ji day master — a companion seat. The structural point — stated by the tradition, not by this site — is that closeness here tends to resemble friendship and side-by-side effort. Whether that sustains an actual marriage depends on the whole chart, which is precisely why this page makes no prediction.

The main qi 己 (Ji, Peer) defines the palace's classical group: Self & Peers. Middle/residual tenants: Gui (Indirect Wealth), Xin (Eating God).

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 Ji Chou (己丑) day pillar?
The Ji Chou day pillar pairs the Ji stem (Yin Earth) with the Chou branch (Earth). Its computed facts: hidden stems Ji (Peer), Gui (Indirect Wealth), Xin (Eating God), the Ji stem at the Tomb stage on this branch, seat relation "undefined", and nayin Thunderbolt Fire (霹雳火).
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 Ji Chou day pillar good or bad?
Neither, on its own. The seat relation (undefined) and the Tomb 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 Thunderbolt Fire mean?
Nayin (霹雳火) is a two-thousand-year-old classification that gives each PAIR of pillars a symbolic element-image — for Ji Chou it is "Thunderbolt Fire", shared with its partner pillar Wu Zi (戊子). 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 (Ji):

Ji Si · Ji Mao · Ji Hai · Ji You · Ji Wei

Wu Zi ←  ·  → Geng Yin

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.