乙 Yi Wood Day Master

The Day Master is the Heavenly Stem of your day pillar. When it is 乙 (yǐ), the chart is read from the point of view of yin Wood. Traditional texts picture 乙 as grass, vines and flowering plants. That image is a memory aid for how the element behaves: flexible, adaptive and relationship-minded; it grows by winding around supports rather than by force.

Every other stem and hidden stem in the chart is then labelled by its relation to 乙: things of the same element are companions, what Wood generates (Fire) is output, what it controls (Earth) is wealth, what controls it (Metal) is officer, and what generates it (Water) is resource. These relations are the Ten Gods.

BaZi is a traditional cultural system. This page explains how the symbols are defined and read; it does not make scientific claims or predictions about your health, money or relationships.

1. Open the free BaZi calculator and enter your birth date, time and place. Guests can calculate without an account.
2. Look at the Day column of the Four Pillars table. The top character is your Day Master; it is highlighted.
3. If it shows 乙, everything on this page applies. The Day Master card also states its element and polarity.
4. Check the time-boundary warnings: births close to 23:00 or to a solar-term change can switch the day or month pillar.

Charts on this site use the published rule set: true solar time by default, the year changes at 立春 (Start of Spring), months change at the 12 节 solar terms and the day changes at 23:00. Example charts below are computed live by the same engine.

For a 乙 Day Master, each of the ten stems always takes the same Ten God role. This table is the quickest way to read a 乙 chart: find a stem anywhere in the pillars (or among the hidden stems) and look up its role.

• 甲甲 Jiayang Wood · Rob Wealth (劫财)
• 乙乙 Yiyin Wood · Friend (比肩)
• 丙丙 Bingyang Fire · Hurting Officer (伤官)
• 丁丁 Dingyin Fire · Eating God (食神)
• 戊戊 Wuyang Earth · Direct Wealth (正财)
• 己己 Jiyin Earth · Indirect Wealth (偏财)
• 庚庚 Gengyang Metal · Direct Officer (正官)
• 辛辛 Xinyin Metal · Seven Killings (七杀)
• 壬壬 Renyang Water · Direct Resource (正印)
• 癸癸 Guiyin Water · Indirect Resource (偏印)

So for 乙: 庚 Geng and 辛 Xin are the officer stars, 戊 Wu and 己 Ji are the wealth stars, and 壬 Ren and 癸 Gui are the resource stars.

The month branch sets the season, and the season is the strongest single factor in judging whether 乙 is strong or weak. Two classical scales are shown: the seasonal state of the element Wood (旺相休囚死) and the twelve growth stages (十二长生) of the stem 乙 itself. Thrives in spring; in summer it wilts without water; in autumn it is vulnerable to metal; in winter it needs sunlight (丙) to keep growing.

• 子子 ZiWater · Strengthening (相) · Sickness (病)
• 丑丑 ChouEarth · Confined (囚) · Decline (衰)
• 寅寅 YinWood · Prosperous (旺) · Peak (帝旺)
• 卯卯 MaoWood · Prosperous (旺) · Coming of Age (临官)
• 辰辰 ChenEarth · Confined (囚) · Capping (冠带)
• 巳巳 SiFire · Resting (休) · Bathing (沐浴)
• 午午 WuFire · Resting (休) · Birth (长生)
• 未未 WeiEarth · Confined (囚) · Nurture (养)
• 申申 ShenMetal · Dead (死) · Conception (胎)
• 酉酉 YouMetal · Dead (死) · Extinction (绝)
• 戌戌 XuEarth · Confined (囚) · Tomb (墓)
• 亥亥 HaiWater · Strengthening (相) · Death (死)

Growth stages for yin stems follow the common "yang forward, yin backward" convention; some schools use the yang sequence for both. The calculator does not use growth stages to change any pillar — they are shown here for study.

A stem is "rooted" when a branch in the chart hides a stem of the same element. For 乙, the branches that contain Wood are 寅 Yin, 卯 Mao, 辰 Chen, 未 Wei, 亥 Hai. A root in the month or day branch usually counts more than one in the year or hour branch, and a main-qi root counts more than a residual one.

• 寅寅 Yin甲 丙 戊 · main qi
• 卯卯 Mao乙 · main qi
• 辰辰 Chen戊 乙 癸 · middle qi
• 未未 Wei己 丁 乙 · residual qi
• 亥亥 Hai壬 甲 · middle qi

Resource roots matter too: branches hiding Water (子 Zi, 亥 Hai by main qi) feed 乙 indirectly.

Judging strength combines three questions: is Wood in season (month branch), is 乙 rooted, and how many companions and resource stars stand beside it compared with output, wealth and officer stars. There is no single score; the calculator shows the counts transparently so you can reason about it.

• If 乙 is strong, the classical approach looks for an outlet or a check: Fire (output) to express it, Earth (wealth) to use it, or Metal (officer) to discipline it. See Wood strong.
• If 乙 is weak, it looks for support: Water (resource) to feed it, or more Wood (companions) to share the load. See Wood weak.
• Seasonal adjustment (调候) can override both: Thrives in spring; in summer it wilts without water; in autumn it is vulnerable to metal; in winter it needs sunlight (丙) to keep growing.

乙 combines with 庚 Geng (the pair is associated with Metal). When 庚 appears next to a 乙 Day Master it is the Direct Officer (正官), so the combination is often read as attachment to that theme. Whether it truly "transforms" depends on the month supporting Metal; most of the time it is read as a bond rather than a change of element.

乙 clashes with 辛 Xin — the stem seven positions away with the same polarity, which is also its Seven Killings (七杀). A clash on the stems shows tension that the rest of the chart may or may not resolve.

Books describe 乙 people with themes such as adaptability, tact, persistence through small steps, and warn about dependence on circumstances, indecision. Read these as prompts for reflection, not fixed traits: the month, the other stems and the luck pillars all modify how the Day Master expresses itself.

• A 乙 chart full of Fire tends to be read as expressive and output-driven.
• Much Metal highlights structure and pressure around the Day Master.
• Much Water highlights learning, support and reflection.
• Much Earth highlights management of resources and practical results.

• "Day Master = whole day pillar." No — only the stem 乙 is the Day Master; the branch below it is the day branch.
• "The year stem is my sign." The year pillar matters, but modern BaZi reads the chart from the day stem.
• "乙 is good/bad." No stem is better than another; balance and context decide how a chart is read.
• "My chart changes if I was born at 23:30." It may: under the 23:00 day boundary used here, the day pillar advances at 23:00. Check the boundary warning.