Yi Si (乙巳) — Yin Wood on the Snake
A climbing plant wrapping a warm stone.
- Heavenly stem
- 乙 · Yi · Yin Wood
- Earthly branch
- 巳 · Si · Snake
- Na Yin
- Lamp-cover Fire
- Hidden stems
- Bing, Geng, Wu
- Hidden gods
- Hurting Officer, Direct Officer, Direct Wealth
- Branch element
- Fire
Flexible growth finding heat and purchase on hard ground.
In BaZi, the day pillar is the pillar of the self. Its heavenly stem is your Day Master — the reference point for every other character in the chart. A person born on a Yi Si day has Yi wood as their Day Master, sitting on the 巳 (fire) branch.
Personality
Yi wood adapts; the Snake underneath gives insight and strategy. You are charming, perceptive and more calculating than you appear, and you usually know what a room needs before the room does. Adaptability is your gift; the risk is becoming whoever the situation rewards.
Work and vocation
Marketing, design, consulting, sales, or media — work where reading people and shaping perception are the core skills.
Relationships
Warm and attentive, and sometimes strategic where honesty would be simpler. Say what you want instead of arranging for it.
Health and rhythm
Nervous heat, sleep and throat. Your body takes the strain of constant social calibration.
Upcoming 乙巳 days
The sexagenary day cycle repeats every sixty days. These are the next dates that fall on Yi Si.
- 2026-11-27
- 2027-01-26
- 2027-03-27
- 2027-05-26
- 2027-07-25
- 2027-09-23
Is this your day pillar?
You do not need to know your day pillar in advance. Enter your birth date, time and place, and the calculator works out all four pillars — then shows how your Day Master reads against the rest of the chart.
Cast your free BaZi chartOther Yi days
All six Yi pillars share the same Day Master. For the stem on its own — its nature, strengths and blind spots — read the Yi Day Master guide.
This page is a study aid for classical BaZi symbolism, not a prediction. It describes tendencies and temperaments, not events, outcomes or dates. For medical, legal or financial decisions, consult a qualified professional.