Yi Wood (乙) Day Master: what it is, the four kinds by birth season, and which one you are

一What a Yi Wood Day Master actually is

Yi Wood Day Master is the yin side of Wood. Its image is not the upright trunk but the vine, the flowering plant, and grass that bends. For the underlying framework, see How to Read a Bazi Chart: A Step-by-Step Guide for Beginners.

In a Four Pillars chart, the Day Master is the heavenly stem of the day pillar; it stands for the person, and every other stem in the chart is named by its relation to it. Yi Wood (乙) is yin Wood. Its classical image is a vine, a flowering plant, grass that bends. The Di Tian Sui (滴天髓) describes Yi Wood as pliant growth: able to cling to Jia Wood, hurt by autumn Metal unless warmed, and thriving when it has sun and water. A common misreading says, “Yi Wood is soft, so a Yi person is weak.” It mistakes a growth style for a strength level. A vine does not push through stone; it finds a crack and climbs. This article sorts Yi Wood into four kinds by birth season, read from the month branch of your chart, and will show how to tell yours. Strong or weak is a separate judgement; the free calculator shows it.

Why yin Wood behaves as it does

Bazi calls each element’s two heavenly stems yang and yin. Jia Wood (甲) is yang Wood; Yi Wood is yin Wood. The element cycles do not change because of polarity, but their feel does:

• Water produces Wood, so Water feeds Yi Wood.
• Wood produces Fire, so Fire is what Yi Wood gives out.
• Wood controls Earth, so Earth is what Yi Wood restrains.
• Metal controls Wood, so Metal is what checks or cuts Yi Wood.

These relations are neutral. A yang Wood chart experiences them in the manner of a trunk; a yin Wood chart experiences them in the manner of a vine: it climbs, winds, and spreads rather than rising by force. In a person, this tends to show up as adaptability, tact, social ease, and endurance. When the same flexibility is unmanaged, it can turn into over-accommodation, dependence on a support, or a loss of direction. Those are tendencies of the stem, not fixed facts about a particular chart.

The stem’s place in the chart

The Day Master is a relation center. Every other stem in the chart is named by its relation to that center. The Ten Gods (十神) are those relation names. For Yi Wood, the table is:

The table keeps the Yi row as the reference point. If another Yi appears elsewhere in the chart, that separate stem follows the same-element rule below and is called Friend.

The rule behind the names is the five-element interaction from the last section, plus polarity. Same element gives Friend for same polarity or Rob Wealth for opposite polarity. The element Wood produces gives Eating God for same polarity or Hurting Officer for opposite polarity. The element Wood controls gives Indirect Wealth for same polarity or Direct Wealth for opposite polarity. The element that controls Wood gives Seven Killings for same polarity or Direct Officer for opposite polarity. The element that produces Wood gives Indirect Resource for same polarity or Direct Resource for opposite polarity. If you know polarity, you can reproduce the table rather than memorise it.

Those names are technical relationship names, not fortune categories. This section only identifies what Yi Wood is, and it does not decide whether any particular chart’s Day Master is strong or weak. The free calculator handles that judgement; the seasonal kinds in the rest of this article are about what this stem finds comfortable and useful, not about a verdict on your strength.

二The four kinds of Yi Wood Day Master charts

The same stem is a different creature in each of the four seasons it can be born into.

The season is read from the month branch: the earthly branch under the month pillar. In a Four Pillars chart, each pillar is written with a heavenly stem above and an earthly branch below. The month pillar is the second of the four pillars, and its lower half decides which of the four climates the Day Master meets first. The groups are:

• spring: Yin 寅, Mao 卯, Chen 辰
• summer: Si 巳, Wu 午, Wei 未
• autumn: Shen 申, You 酉, Xu 戌
• winter: Hai 亥, Zi 子, Chou 丑

Chen, Wei, Xu, and Chou are transition months at the end of each season; the classical seasonal method still reads them with the season they close.

The lists below follow the Qiong Tong Bao Jian (穷通宝鉴), the classical reference for seasonal climate. Its method is called tiao hou 调候, “adjusting the climate.” The question is practical: what does a Yi Wood born in this season need around it to be comfortable and useful? It is one classical school’s method, not the only one. It is also separate from the strong/weak judgement. Strength is about how much support and control the whole chart gives the Day Master. The seasonal lists are about working conditions. A helper stem is present when it appears in a visible year, month, or hour stem, or is hidden inside one of the branches.

1. Spring Yi Wood: sun and rain before more growth

Spring is the season that belongs to Wood. For the yin side of Wood, it is the young part of the cycle: the vine can spread and climb, but it has not become a trunk. The method does not answer with more Wood. Its first helper is Bing Fire 丙, and its second is Gui Water 癸. The classical image is a flowering plant in its own season: it wants sun and rain. Bing gives light and warmth; Gui waters the roots.

Spring Yi Wood is wary of Geng Metal and Xin Metal. The control cycle is direct: Metal controls Wood. A young vine that is cut too early is forced away from the path it was already finding by winding.

The asset shows in situations where a plan is still being revised and the route is not fixed. A spring-born Yi Wood tends to be comfortable there. It adapts, keeps several relationships open, and finds a side route when the obvious one is blocked. The asset is flexibility and social ease. The liability appears in the same setting: if every other person’s request is treated as a new direction to follow, the vine ends up moving toward whoever pulled last, and its own direction disappears.

2. Summer Yi Wood: water before fire, and fire only in measure

Summer is Fire season. For Yi Wood, Wood produces Fire, so the thing the Day Master gives out is the same element that fills the month. Drought is the danger. The first helper, Gui Water 癸, is not a fire. Water produces Wood, so Gui goes to the root and keeps the stem from being spent by its own output. After Gui is in place, Bing Fire can appear in measure: some Fire gives the plant a way to express, but a summer chart already has Fire as its weather.

Summer Yi Wood is wary of Ding Fire and Wu Earth. Ding adds dry heat where the season is already hot. Wu Earth is the dry Earth side of the element Wood is supposed to control; after too much heat, it is earth that holds no moisture for the vine.

The practical strength of a summer-born Yi Wood shows when a quick response matters: presenting an idea, answering questions, showing what is being made. The asset is release. This shape tends to turn thought into visible form without long delay. The liability appears when release has no limit. If the output keeps coming after the moment has passed, the same chart spends its energy as heat and leaves little for the root.

3. Autumn Yi Wood: metal is the climate

Autumn is Metal season. In the control cycle, Metal controls Wood. For a soft Yi Wood, this is the season with the strongest external pressure: the element that checks the Day Master is the element of the month itself. The method’s first helper is Gui Water 癸. Water produces Wood, so Gui gives the stem something to drink while the metal months pass. Its second helper is Bing Fire 丙. In the control cycle, Fire controls Metal, and a measured amount of Bing works against the sharpness of the season. Autumn Yi Wood is wary of Geng Metal and Xin Metal. If those two appear unchecked, the vine spends too much energy simply avoiding the cut.

In practice, an autumn Yi Wood tends to do clean work inside firm constraints: exact formats, deadlines, conditions that are not optional. The asset is precision under discipline. Rather than push against the frame, it finds the path the frame still leaves open. The liability shows when the pressure does not let up and no warming or nourishing helper is present. Then flexibility slides into over-accommodation. The person can become the one who agrees with the rule-giver and, in the process, loses track of what the vine itself wanted to do.

4. Winter Yi Wood: fire to warm, earth to stop the flood

Winter is Water season. Water is the element that produces Wood, so a winter-born Yi Wood is surrounded by its own source. In winter, that source arrives as cold and wet. The method does not celebrate the water. It asks for Bing Fire 丙 first, because a vine needs warmth before it can use what is around it. Then it asks for Wu Earth 戊. The control cycle gives a reason: Earth controls Water. Wu Earth works as an earth bank, holding back enough of the flood for the root to sit in something firm.

Winter Yi Wood is wary of Ren Water and Gui Water. Both are Water stems, and both are resources for Wood, because Water produces Wood. But in a Water month, more Water is not more help. It changes nourishment into immersion.

Behaviorally, the winter shape tends to work on a long clock. It can continue through a slow task after the initial interest has worn off. That endurance is the asset. The liability is patience that has become waiting. Without some warming presence, a winter-born Yi Wood can stay too long in a cold, low-energy situation, accommodating it because starting a new direction feels harder than keeping still.

三How to tell which kind you have

Checking your own chart takes four steps, and the free calculator shows you the pieces you need.

To run the check, you read two parts of the chart: the stem of the day pillar and the branch of the month pillar. Tables like the three examples on this page have already done most of the counting; your job is to read the result in order. The method is easier to compare with Jia Wood (甲) Day Master: what it is, the four kinds by birth season, and which one you are.

1. Confirm the Day Master stem in the day pillar. The day pillar is the third of the four pillars, and its upper stem is the Day Master. This article covers Yi Wood (乙). If your Day Master is Yi, the following check applies. Every other stem in the chart is named by its relation to that Day Master; that relation is what the ten gods above each column show.

1. Read the earthly branch of the month pillar. The month pillar is the second of the four pillars. Its lower half is the earthly branch, and that branch carries the season. In the seasonal method, the month branch is the first climate the Day Master meets.

1. Map that month branch to a season. Use the table:

Chen, Wei, Xu, and Chou are the transition months at the end of each season; the classical seasonal method still reads them with the season they close.

1. Look for the season’s helper stems, then note what stands in the way. The helper orders are: spring wants Bing Fire first and Gui Water second; summer wants Gui Water first and Bing Fire second in measure; autumn wants Gui Water first and Bing Fire second; winter wants Bing Fire first and Wu Earth second. The wary lists are: spring and autumn are wary of Geng and Xin Metal; summer is wary of Ding Fire and Wu Earth; winter is wary of Ren and Gui Water.

A stem is present when it appears as a visible year, month, or hour stem, or is hidden inside one of the branches. The weighted totals on a chart page count a visible stem as 1.0, a branch’s main qi as 1.0, its middle qi as 0.5, and its residual qi as 0.3. That is the same weighting the free calculator uses, so the totals are already printed for you.

The seasonal method does not decide whether your Day Master is strong or weak. Strength is a whole-chart calculation, and the free calculator reports it separately. This article does not make that call. The seasonal check only tells you which climate you were born into and what helpers surround it.

Chart A: autumn, Control-heavy

Chart A is an autumn Yi Wood with Control as its heaviest group, at 5.5.

Its month branch is Shen (申), which belongs in the autumn row of the season table. The group totals are Support 1.0, Output 1.0, Wealth 1.9, and Control 5.5. Control is the name for Direct Officer plus Seven Killings, the two relations that check the Day Master; in Chart A those weighted totals are Direct Officer 3.5 and Seven Killings 2.0.

For autumn, the seasonal method wants Gui Water first and Bing Fire second. Chart A has no Gui Water: it is absent. Bing Fire is present at 1.0. The autumn wary list names Geng and Xin Metal, and this chart carries exactly those stems at Geng 3.5 and Xin 2.0. So the chart has one helper present, one helper missing, and the two stems autumn tells a Yi Wood to be wary of sitting at the largest totals in the chart.

Chart B: summer, Output-heavy

Chart B is a summer Yi Wood with Output as its heaviest group, at 6.0.

Its month branch is Wu (午), which belongs in the summer row of the season table. The group totals are Support 1.0, Output 6.0, Wealth 1.1, and Control 1.0. Output is the name for Eating God plus Hurting Officer, the Fire that Wood produces. In Chart B, Hurting Officer is 4.0 and Eating God is 2.0.

For summer, the seasonal method wants Gui Water first and Bing Fire second. Chart B has Gui Water present at 1.0 and Bing Fire present at 4.0. The summer wary list names Ding Fire and Wu Earth; Ding appears at 2.0 and Wu Earth at 0.6. This makes Chart B different from Chart A in the crucial way: its first helper is present, even though its largest visible output is Fire.

Chart C: winter, Support-heavy

Chart C is a winter Yi Wood with Support as its heaviest group, at 7.0.

Its month branch is Hai (亥), which belongs in the winter row of the season table. The group totals are Support 7.0, Output 0.0, Wealth 1.0, and Control 0.0. Support is the name for Friends, Rob Wealth, and Resources, meaning the same-element stems plus the stems that produce Wood. In Chart C the detail is Friend 2.0, Rob Wealth 2.0, Direct Resource 2.0, and Indirect Resource 1.0; the Wealth group is Indirect Wealth at 1.0.

For winter, the seasonal method wants Bing Fire first and Wu Earth second. Chart C has neither: Bing Fire is absent and Wu Earth is absent. The winter wary list names Ren and Gui Water, and both appear, Ren at 2.0 and Gui at 1.0. Those two water stems are also part of the chart’s Support group, so the largest group in Chart C contains exactly the stems that winter says to watch.

What the three charts show together

All three charts share the same Day Master, Yi Wood. The month branch changes, and with it the season and the helper list. Chart A is Control-heavy in autumn and is missing its first helper; Chart B is Output-heavy in summer and has both helpers present; Chart C is Support-heavy in winter and has neither helper present. That is why the group totals are not the same thing as seasonal comfort. A chart can be heavy in Support yet miss the helper its season asks for, and a chart can be heavy in Output yet still carry the water that summer needs.

These three charts are structural illustrations, not anyone’s fate. Your own check ends at “which season and what is around it,” not at a verdict.

四What to do once you know

The stem and the season are fixed, what you arrange around them is not.

Your chart fixes your Day Master and month branch. It does not fix your schedule, your workplace, or how your work is received. The seasonal method asks what makes Yi Wood comfortable and useful, and a comfort list reads as an arrangement list: what to bring close, what to keep away. Each season below suggests practical arrangements. They are tendencies, not promises. This point connects directly with Bing Fire (丙) Day Master: what it is, the four kinds by birth season, and which one you are.

Spring months (Yin, Mao, Chen)

Helper order: Bing Fire first, Gui Water second. For a working life, that means the work should be seen before it is over-polished. Send an early version of a task to someone while it is still changeable. When a spring chart receives a real response to that early version, its next step tends to come easily; when the version stays unseen, growth continues but no one responds to it. Gui Water second means one weekly nourishing slot with no score attached — a reading session, a practice, a mentoring talk — kept as firmly as a deadline. The wary stems are Geng and Xin Metal, which in this season act like early pruning. If you are new in a role, ask for examples and coaching before you ask for a rank. Let the work root before it is trimmed.

Summer months (Si, Wu, Wei)

Gui Water comes before Bing Fire, so the sequence inside the day matters: a quiet slice first — planning, notes, a walk, a conversation that is not a delivery. When a summer chart goes from one visible commitment to another without that slice, the output gets louder and the ground gets drier. The same output tends to flow better after a slot of replenishment. Bing Fire is wanted in measure, so keep the presentations that get a real response and let the rest go. The wary stems are Ding Fire and Wu Earth. In a dry chart, they read as more of the same output and more dry procedure; when the week becomes all delivery and no refill, the drought is already there.

Autumn months (Shen, You, Xu)

Gui Water comes first, Bing Fire second. Before a formal judgement arrives, get the standard in your hands: a model, an example, a checklist. Working toward that standard in steps is the water that keeps the wood alive. Then take the work into a conversation before it is final. Presenting a draft and discussing it turns a one-way review into a revision, which is the practical form of Fire softening Metal. Geng and Xin are wary stems, but the method does not tell autumn charts to remove them. They need Fire to soften them and Water to keep the wood alive. When the appraisal feels sharp, do not disappear into solitary effort; isolation adds no Fire.

Winter months (Hai, Zi, Chou)

Bing Fire comes first here, so put another person early in the day — a colleague to answer a question, a listener to hear the plan, a shared task to open. When a winter chart works alone in its head for several days, the head keeps adding plans and doubts. Speaking the plan out loud tends to warm it and turn it into something workable. Wu Earth comes second, as one fixed commitment with a date: a deadline, a promise to show the work. That is the earth that stops the flood. The wary stems are Ren and Gui Water. Be careful with courses, books, and research that keep you in preparation. For this kind the release date matters more than the next reading list.

Common misreadings

“Yi Wood is soft, so a Yi person is weak.” Soft is a growth style, not a strength score. The sample charts include a support-heavy winter chart and a control-heavy autumn chart; neither note draws the strong/weak line. Strength is a whole-chart count, and the calculator is the tool that counts it.

“Metal controls Wood, so Geng and Xin are harmful to Yi Wood.” The control cycle states a direction, not a verdict. Autumn lists Geng and Xin as stems to be wary of, then gives Bing Fire to soften them and Gui Water to keep the Wood alive. It is Metal left unchecked that harms; softened Metal is a different situation.

“Water produces Wood, so more Water is better for Yi Wood.” Production is a direction, not a dose. The winter list names Ren and Gui as wary stems and asks for Wu Earth to stop the flood. Water that feeds spring growth can submerge winter growth.

Where this stops

The four kinds are one classical lens, the seasonal climate method of the Qiong Tong Bao Jian, applied to one Day Master. A full chart has eight characters plus hidden stems; strength is judged across all of them. This section has described conditions that tend to feel comfortable and useful, not the content of a life. Let the month branch identify the season, and let the calculator identify strength. The rest belongs to the chart as a whole.

Sifu Xion · 8th-generation Form School practitioner · M.Sc. Data Science, Shanghai.

Cast your own chart with the free Bazi calculator to see which configuration you carry. If you would rather have him read the whole chart himself, the full written reading covers all ten gods, your luck pillars and what to do with them.