← All sixty day pillars

Day Pillar 18 of 60 · Nayin White Wax Metal

Xin Si (辛巳) Day Pillar — Yin Metal on the Snake

The Xin Si day pillar pairs the Xin day master (Yin Metal) with the Si branch (Fire, the Snake). 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辛 Xin · Yin Metal
Day branch巳 Si (Snake) · Fire
Hidden stems丙 Bing (Direct Officer, main qi); 庚 Geng (Rival, middle qi); 戊 Wu (Direct Resource, residual)
Stage of the stem hereDeath (8 of 12)
NayinWhite Wax Metal · 白蜡金 (shared with Geng Chen 庚辰)
Seat relationBranch controls stem (jie jiao) — traditional term: 截脚

How Xin sits on Si

The branch controls the stem: Fire bears down on Metal, so the Xin 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.

undefined

Nayin: White Wax Metal

White Wax Metal (白蜡金): metal in its softest, freshest state — newly formed, easily shaped, not yet hardened. Timing and environment decide what it becomes.

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 Xin 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 丙 (Bing, Direct Officer) defines the palace's classical group: Influence. Middle/residual tenants: Geng (Rival), Wu (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 Xin Si (辛巳) day pillar?
The Xin Si day pillar pairs the Xin stem (Yin Metal) with the Si branch (Fire). Its computed facts: hidden stems Bing (Direct Officer), Geng (Rival), Wu (Direct Resource), the Xin stem at the Death stage on this branch, seat relation "undefined", and nayin White Wax Metal (白蜡金).
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 Xin Si day pillar good or bad?
Neither, on its own. The seat relation (undefined) and the Death 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 White Wax Metal mean?
Nayin (白蜡金) is a two-thousand-year-old classification that gives each PAIR of pillars a symbolic element-image — for Xin Si it is "White Wax Metal", shared with its partner pillar Geng Chen (庚辰). 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 (Xin):

Xin Wei · Xin Mao · Xin Chou · Xin Hai · Xin You

Geng Chen ←  ·  → Ren Wu

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.