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Day Pillar 24 of 60 · Nayin Rooftop Earth

Ding Hai (丁亥) Day Pillar — Yin Fire on the Pig

The Ding Hai day pillar pairs the Ding day master (Yin Fire) with the Hai branch (Water, the Pig). 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丁 Ding · Yin Fire
Day branch亥 Hai (Pig) · Water
Hidden stems壬 Ren (Direct Officer, main qi); 甲 Jia (Direct Resource, middle qi)
Stage of the stem hereConception (11 of 12)
NayinRooftop Earth · 屋上土 (shared with Bing Xu 丙戌)
Seat relationBranch controls stem (jie jiao) — traditional term: 截脚

How Ding sits on Hai

The branch controls the stem: Water bears down on Fire, so the Ding 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: Rooftop Earth

Rooftop Earth (屋上土): earth baked onto a roof — ground in its most refined, shelter-giving application.

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 Ding 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 壬 (Ren, Direct Officer) defines the palace's classical group: Influence. Middle/residual tenants: Jia (Direct 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 Ding Hai (丁亥) day pillar?
The Ding Hai day pillar pairs the Ding stem (Yin Fire) with the Hai branch (Water). Its computed facts: hidden stems Ren (Direct Officer), Jia (Direct Resource), the Ding stem at the Conception stage on this branch, seat relation "undefined", and nayin Rooftop Earth (屋上土).
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 Ding Hai day pillar good or bad?
Neither, on its own. The seat relation (undefined) and the Conception 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 Rooftop Earth mean?
Nayin (屋上土) is a two-thousand-year-old classification that gives each PAIR of pillars a symbolic element-image — for Ding Hai it is "Rooftop Earth", shared with its partner pillar Bing Xu (丙戌). 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 (Ding):

Ding Mao · Ding Chou · Ding You · Ding Wei · Ding Si

Bing Xu ←  ·  → Wu Zi

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.