Yi Si · 乙巳
Yi Si pairs a Yin Wood Day Master with 巳 (the Snake), a Fire branch. If this is your day pillar, the pairing below describes tendencies worth observing — not a verdict.
The Day Master on top
Yin Wood · 乙 — The classical image for 乙 is a vine or climbing grass: growth that finds a way around, through, and along whatever exists. A Yin Wood Day Master tends to advance by adapting — reading the terrain and adjusting the route, without giving up the destination.
Read the full profile →The branch beneath — your spouse palace
In a day pillar, the branch is read as the spouse palace: the texture of close partnership. 巳 (the Snake) carries these hidden stems, each read as a relationship between that stem and your Day Master:
丙
Output (Sharp)
Sharp output — wit, critique, and originality that can cut as well as create.
庚
Authority
Authority with structure — rules, reputation, duty, and roles that hold you accountable.
戊
Direct Wealth
Direct wealth — steady earnings, tangible assets, and accountable exchange.
Na Yin
The Na Yin of Yi Si is 覆灯火 — "Lantern Fire". Na Yin is a poetic sixty-fold naming of the pillars, used as a secondary texture rather than a primary verdict.
Stage of the cycle
Bathing — Vulnerable openness — early energy, exposed and still forming.
Void branches (Xun Kong)
Charts anchored on 乙巳 treat 寅卯 as "void" — branches whose signals are read as weakened or delayed rather than absent.
Is Yi Si actually your day pillar?
The day pillar comes from your exact birth date — and near midnight, from true solar time. Calculate it instead of guessing.
As with everything on Truenoon, this page describes observable tendencies, not a verdict on who you are.