← All sixty day pillars

Day Pillar 2 of 60 · Nayin Gold in the Sea

Yi Chou (乙丑) Day Pillar — Yin Wood on the Ox

The Yi Chou day pillar pairs the Yi day master (Yin Wood) 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乙 Yi · Yin Wood
Day branch丑 Chou (Ox) · Earth
Hidden stems己 Ji (Indirect Wealth, main qi); 癸 Gui (Indirect Resource, middle qi); 辛 Xin (Seven Killings, residual)
Stage of the stem hereDecline (6 of 12)
NayinGold in the Sea · 海中金 (shared with Jia Zi 甲子)
Seat relationStem controls branch (gai tou) — traditional term: 盖头

How Yi sits on Chou

The stem controls the branch: Wood governs Earth, so the Yi 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.

undefined

Nayin: Gold in the Sea

Gold in the Sea (海中金): metal submerged in ocean depths — strength that is real but hidden, and must be drawn up before it can be used. Classical commentary pairs it with patience under pressure: the value is there, the visibility is not.

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 Yi 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 己 (Ji, Indirect Wealth) defines the palace's classical group: Wealth. Middle/residual tenants: Gui (Indirect Resource), Xin (Seven Killings).

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 Yi Chou (乙丑) day pillar?
The Yi Chou day pillar pairs the Yi stem (Yin Wood) with the Chou branch (Earth). Its computed facts: hidden stems Ji (Indirect Wealth), Gui (Indirect Resource), Xin (Seven Killings), the Yi stem at the Decline stage on this branch, seat relation "undefined", and nayin Gold in the Sea (海中金).
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 Yi Chou day pillar good or bad?
Neither, on its own. The seat relation (undefined) and the Decline 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 Gold in the Sea mean?
Nayin (海中金) is a two-thousand-year-old classification that gives each PAIR of pillars a symbolic element-image — for Yi Chou it is "Gold in the Sea", shared with its partner pillar Jia Zi (甲子). 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 (Yi):

Yi Hai · Yi You · Yi Wei · Yi Si · Yi Mao

Jia Zi ←  ·  → Bing 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.