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Yi Si Day Pillar (乙巳): A flower opening in sunlight
Quick answer: Yi Si (乙巳) is pillar 42 of 60. It is Yin Wood sitting on the Snake (Fire). Nayin: Lamp Fire. Sitting star: Hurting Officer; life stage: Bath. Void branches: Yin and Mao (寅卯: Tiger, Rabbit).
日柱At a glance
| Position | 42 / 60 |
|---|---|
| Day stem | 乙 · Yin Wood |
| Day branch (spouse palace) | 巳 · Snake (Fire) |
| Hidden stems | 丙 Hurting Officer and 戊 Direct Wealth and 庚 Direct Officer |
| Sitting star | Hurting Officer |
| Life stage (12 phases) | Bath |
| Nayin | Lamp Fire |
| Void branches | Yin and Mao (寅卯: Tiger, Rabbit) |
| Year pillar in | 1905, 1965, 2025 |
性格Yi Si personality
Yi Si is a plant blooming in warm fire: charming, expressive and sociable. These people are often artistic or persuasive, with a talent for presentation and style. They attract attention easily. Their energy is best spent on a few things done well.
坐星Sitting on Hurting Officer
You sit on the star of expression: quick, outspoken and original, with strong opinions. Talent is high, patience with rules is low.
长生Life stage: Bath
Measured on the 12-phase cycle, 乙 on 巳 is at Bath: a young person learning about the world: charming, curious, emotionally changeable.
纳音Nayin: Lamp Fire
Each pair of pillars shares one of 30 Nayin, or "sound" elements. Yi Si belongs to Lamp Fire, pictured as lamp fire: a small light that guides others in the dark. Nayin is an older layer of Chinese astrology and is read as a background image, not as your Day Master's element.
Your day pillar is one of four. See all four pillars, your elements and your 2027 outlook for free.
Get your free reading婚恋Love and the spouse palace
In BaZi the day branch is the spouse palace. For Yi Si it holds the Snake, which traditionally harmonises with the Monkey (six harmony) and the Rooster and Ox (three harmony), and clashes with the Pig.
The most harmonious day pillar for Yi Si is Geng Shen (庚申): its stem combines with yours and its branch forms a six-harmony pair (天合地合). The most challenging are Ji Hai (己亥) and Xin Hai (辛亥): stem against stem and branch against branch (天克地冲). Other pillars in your chart matter more than this single pairing.
空亡Void branches
Yi Si belongs to the Jia Chen (甲辰) decade (旬), whose void branches are Yin and Mao (寅卯: Tiger, Rabbit). Traditionally, years and months of these branches are said to make plans feel less solid. The next such years: 2034, 2035, 2046, 2047.
日期When does Yi Si come round?
As a day: the 60-day cycle repeats every 60 days. Next Yi Si days: Nov 27, 2026 · Jan 26, 2027 · Mar 27, 2027 · May 26, 2027. As a year pillar: 1905, 1965, 2025.
Your Day Master 乙 also has its own page: Yi Wood Day Master.
问答Yi Si day pillar FAQ
How do I know if my day pillar is Yi Si?
The day pillar comes from your exact birth date, not your birth year. Enter your birth date in the free day pillar calculator or full chart calculator; if it shows 乙巳, this page describes you.
What is the Nayin of 乙巳?
乙巳 belongs to Lamp Fire, shared with Jia Chen (甲辰).
Which day pillar is most compatible with Yi Si?
Traditionally Geng Shen (庚申), because the stems combine and the branches form a six-harmony pair. Always read the whole chart, not one pillar.
What are the void branches of 乙巳?
Yin and Mao (寅卯: Tiger, Rabbit).
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