Geng Metal (庚) Day Master: what it is, the four kinds by birth season, and which one you are

一What a Geng Metal Day Master actually is

A Geng Metal Day Master is a person whose day pillar carries the yang Metal stem Geng (庚) — the classical image of an axe, a sword, raw ore. For the underlying framework, see How to Read a Bazi Chart: A Step-by-Step Guide for Beginners.

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. Geng is yang Metal: hardness, edge, the power to cut and to decide. The classical text Di Tian Sui (滴天髓) gives the fuller picture. It describes Geng as strong and sharp, made useful by Fire that forges it, tempered by Water, and fond of Earth in the right amount. That is why the common misreading, “Geng Metal people are cold and aggressive,” misses. It mistakes what Geng undergoes — Fire forging, Water tempering — for what Geng is. The classical concern is usefulness: metal that is shaped and then applied to what needs cutting. This article sorts the Geng Day Master into four kinds by birth season and shows you how to tell yours.

What the element already tells you

Geng’s place in the five cycles produces its roles. In the production cycle, Earth produces Metal, and Metal produces Water. In the control cycle, Fire controls Metal, and Metal controls Wood. The relationship system is built from those four statements:

• Earth produces Metal, so the Earth stems stand for what feeds a Geng Day Master — Resource.
• Metal produces Water, so the Water stems stand for what flows out of Geng — Output.
• Fire controls Metal, so the Fire stems stand for what presses on Geng — Control.
• Metal controls Wood, so the Wood stems stand for what Geng acts upon — Wealth.
• Another Metal stem is the remaining case: it stands next to Geng rather than above or below it in either cycle.

Each element has a yang stem and a yin stem. Geng is yang. With the same polarity as Geng, a stem receives one label in its pair; with opposite polarity, it receives the other. That distinction gives the ten labels below.

The Ten Gods of a Geng Day Master

Bazi formalizes this into the Ten Gods (十神): ten labels that name every other stem’s position relative to the Day Master. For a Geng Day Master:

The pattern above follows from the cycles plus polarity. Same element with the same polarity is called Friend; in the row above it is the Day Master itself, because that is the Geng the person is. Same element with opposite polarity is Rob Wealth. For each of the other four element relations, the stem with Geng’s polarity takes the first label in the pair: Indirect Wealth, Eating God, Seven Killings, Indirect Resource. The stem of opposite polarity takes the second label: Direct Wealth, Hurting Officer, Direct Officer, Direct Resource. If you know the element relation and the polarity, the label is decided; no personal history is needed for this step.

These are structural positions, not personality verdicts. They tell you where a stem stands in relation to the Day Master. The rest of the article uses those positions to ask a classical seasonal question: for a Geng born in each of the four seasons, which of these stems helps the metal become useful, and which one gets in the way. That seasonal reading is about comfort and usefulness, not about strength. Whether a particular Day Master is strong or weak is a separate judgment, and the free calculator on this page shows that.

二The four kinds of Geng Metal 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 of the month pillar: Yin, Mao and Chen are spring; Si, Wu and Wei are summer; Shen, You and Xu are autumn; Hai, Zi and Chou are winter. Chen, Wei, Xu and Chou are the transition months, and the classical method still reads them with the season they close. The seasonal method used here is Qiong Tong Bao Jian (穷通宝鉴), the “adjusting the climate” (tiao hou, 调候) school. It asks what a Geng born in that season needs around it to be comfortable and useful; it is one school’s method, not the only one, and it is separate from the strong/weak judgment the free calculator gives you. A helper stem counts as present when it appears in a visible stem (year, month or hour) or hidden inside a branch. The assistant a season asks for is not a mark of strength or weakness; it is the condition that lets the metal be used.

1. Born in spring (Yin, Mao, Chen month)

Spring is the Wood season. In the production cycle, Wood produces Fire, and in the control cycle, Fire controls Metal. The method therefore treats a spring-born Geng as raw ore that has a forge available nearby but has not yet been put into it.

The method looks first for Ding Fire: Ding is the fire that forges the raw ore. It looks next for Jia Wood, because Wood produces Fire, and Jia is the fuel that keeps Ding burning. It is wary of Ren Water and Gui Water. Water controls Fire, and water near a spring Geng cools the forge before the ore takes shape. Without the forge, Geng remains sharp in substance but unformed in use.

The asset side tends to show when the situation has a visible standard. Give this kind of Geng a concrete judgment — does this work meet the specification, did this person break the rule, should this deal continue — and the decision tends to come quickly and to hold. The courage is cleanest when the assignment is clear. The liability appears when no standard is supplied and the surrounding talk keeps adding sympathy and explanation. Then the same directness has nothing to cut along, and Geng’s plain speech turns into plain cutting. In an argument, the last sentence tends to be true but destructive — it moves from the act to the person, and it cuts what should have been kept.

2. Born in summer (Si, Wu, Wei month)

Summer is the Fire season, and Fire controls Metal. A Geng born in summer is metal in the furnace. The furnace already supplies all the heat the metal can take; the problem is that the heat does not stop.

The method looks first for Ren Water, then Gui Water. Both are Water, and Water controls Fire; their job in this season is to quench the metal and temper it. The method is wary of Bing Fire and Ding Fire, because adding Fire to a Fire season only raises the temperature of a metal that is already inside the furnace.

This shape tends to work best when the pressure is genuine and external. In the operational moments — a breakdown, a missed deadline, a public mistake — summer Geng tends to be the calm one in the room, giving short orders while other people are still reacting. That is the furnace doing its work: the metal is being shaped by heat. The liability shows when the heat does not break. After days or weeks of unrelieved pressure, the same short orders come out as verdicts. The criticism is accurate, but it wounds; the hearer remembers the cut, not the correction. When Ren or Gui Water is present in the chart, the tempering step exists: the decision can be delivered after a cooling pause. When the water is absent, no part of the chart lowers the temperature, and the harshness of Geng is what people walk away with.

3. Born in autumn (Shen, You, Xu month)

Autumn is the season in which Metal is at full strength. A Geng born here does not need to be made stronger. The metal is already formed; the question is whether it gets shaped into something with an edge and a use.

The method looks first for Ding Fire. Fire controls Metal, and Ding is the forge that gives strong metal its form. It looks next for Jia Wood, because Wood produces Fire and Jia feeds that forge. It is wary of Wu Earth and Ji Earth. Earth produces Metal, but a metal at full strength does not need to be produced further; extra Earth does not make it stronger, it buries it.

The asset side often shows as sureness in finishing. Give this kind of Geng a complicated task with an exact definition of done, and the task tends to get completed without supervision or applause. Geng’s taste for clear rules and finished jobs is at its most natural here. The liability appears when Earth buries the metal — in practice, when support becomes thicker than use: heavy process, layers of approval, a role where the rulebook decides more than the person does. In that situation, the same sureness turns into rigidity. When a legitimate exception arrives, the autumn Geng tends to answer with the rule alone; because the metal was not worked by fire, its strength has not been shaped into judgment, and what should have been a decision becomes a verdict.

4. Born in winter (Hai, Zi, Chou month)

Winter is the cold season. For Geng, cold is not a neutral background; it is the condition of the metal itself. A blade that is frozen is still a blade, but it cannot be used well until it is warmed.

The method looks first for Ding Fire, then for Bing Fire. Ding Fire forges the cold metal; Bing Fire warms it. Both are needed because in winter one fire alone has to do two jobs. The method is wary of Ren Water and Gui Water: water is what freezes the metal further.

This kind tends not to be the first person to speak in a heated situation. It collects information first — walks around the problem, tests the facts, keeps the voice low. That patience is the asset. In a confrontation, a winter Geng with fire available stays composed, puts the concrete facts on the table, and decides when the picture is complete. The liability shows when the chart has no fire to warm the metal. Then the same composure becomes coldness of a particular kind: not loud aggression, but a precise phrase delivered with total calm that ends the argument and damages the relationship. No anger is needed. The metal is simply cold, and cold metal cuts whatever comes near it — including what should have been kept.

三How to tell which kind you have

Finding which of the four seasonal kinds a Geng chart belongs to takes four steps, and the free calculator shows you the pieces. The method is easier to compare with Ji Earth (己) Day Master: what it is, the four kinds by birth season, and which one you are.

None of these steps is the strong/weak calculation. The calculator reports whether your Day Master is strong or weak separately; the seasonal method here is about what is around the metal, not a verdict on it.

The check in four steps

1. Confirm the Day Master. In the day pillar, the upper heavenly stem is the Day Master. If that stem is Geng, the relation labels and the seasonal helper lists above are the ones that apply to it.

1. Read the month branch. Go to the month pillar and look only at its earthly branch. That branch is the season marker for this method.

1. Map the month branch to a season. The seasons are read from the month branch, not from the modern Gregorian month name.

Chen, Wei, Xu, and Chou are transition months, and the classical seasonal method reads them with the season they close.

1. Look for the season’s helper stems. A helper is present if it appears as a visible stem in the year, month, or hour, or hidden inside any branch. The chart tables above already give you the weighted totals, using visible stems at 1, hidden main qi at 1, middle qi at 0.5, and residual qi at 0.3. Then note the stems that season is wary of, and how much weight each one carries in the chart.

The three charts below are worked examples of the check.

Chart A: a summer Geng with Control as its heaviest group

Chart A is a summer Geng: the month branch is Wu, and its heaviest group is Control.

The control group combines Direct Officer and Seven Killings, and in this chart those two add up to 6.0. Looking at the individual stems, Seven Killings sits at 3.0 and Direct Officer sits at 3.0. The other groups are smaller: Support is 1.8, Output is 1.0, and Wealth is 0.0.

For Geng born in summer, the seasonal list asks first for Ren Water and then for Gui Water. In Chart A, Ren is absent, and Gui is present at 1.0. So there is some Water in the chart, but not the first-choice Ren.

The same seasonal list warns Geng in summer against Bing Fire and Ding Fire. In this chart, Bing Fire appears at 3.0 and Ding Fire appears at 3.0. In other words, the Fire that heavy Control is built from is also the Fire that summer Geng is wary of. That is a fact about the arrangement; it is not a judgment about whether the Day Master is strong or weak.

Chart B: a winter Geng with Output as its heaviest group

Chart B is a winter Geng: the month branch is Hai, and its heaviest group is Output.

Output combines Eating God and Hurting Officer. Here Eating God sits at 3.0 and Hurting Officer sits at 3.0, so the Output group is 6.0. The other groups are much lighter: Support is 0.5, Wealth is 1.0, and Control is 1.0.

For Geng born in winter, the seasonal list asks first for Ding Fire, then for Bing Fire. In Chart B, Ding is present at 1.0, and Bing is absent. So there is a forging fire available, but no second fire to warm the cold metal.

The same seasonal list warns Geng in winter against Ren Water and Gui Water. In this chart, Ren Water appears at 3.0 and Gui Water appears at 3.0. Both warning stems are the same Water stems that make up the heavy Output group. That structure suits the season’s warning precisely: the chart has a fire to work with, but it is surrounded by the Water it needs to be wary of.

Chart C: an autumn Geng with Support as its heaviest group

Chart C is an autumn Geng: the month branch is Xu, and its heaviest group is Support.

Support combines Resource with friends. In this chart, Indirect Resource sits at 4.0, Rob Wealth at 2.3, Friend at 1.0, and Direct Resource at 1.0, giving a Support group total of 8.3. The other groups are small by comparison: Output is 0.8, Wealth is 0.5, and Control is 0.6.

For Geng born in autumn, the seasonal list asks first for Ding Fire, then for Jia Wood. In Chart C, Ding is present at 0.6, and Jia is absent. The metal can be worked on, but the fuel that would keep the fire going is missing.

The same seasonal list warns Geng in autumn against Earth that buries it. In this chart, Wu Earth appears at 4.0 and Ji Earth appears at 1.0. The Earth-heavy Support group is exactly what autumn Geng is wary of. The heavy Earth is not a strength or weakness label for the Day Master; it is the condition the seasonal helper list is pointing at.

What the three charts show together

The three charts line up as a useful contrast. Chart A is summer with Control at 6.0 and only one small Water helper at 1.0. Chart B is winter with Output at 6.0 and one Ding Fire helper at 1.0. Chart C is autumn with Support at 8.3 and only residual Ding at 0.6. In each case, the group that dominates the chart is also the group the season warns about: Fire in summer, Water in winter, Earth in autumn.

These three charts are structural illustrations, not anyone’s fate. Your own check ends with the season and what is around the metal, not with a verdict on strength, because that strong/weak report belongs to the free calculator.

四What to do once you know

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

The helper lists describe situations, not objects. Ding Fire is a deadline, a spec, or a person who will judge the result. Jia Wood is a concrete problem waiting to be worked on. Water is exploration and open-ended conversation. Put the Fire-shaped situation at the start of a task; put Water-shaped exploration after something has been cut. This point connects directly with Xin Metal (辛) Day Master: what it is, the four kinds by birth season, and which one you are.

Spring-born Geng (Yin, Mao, Chen months)

Spring is the Wood season, so a spring-born Geng has a forge nearby but has not been taken to it yet.

• Write the acceptance criteria before doing the work. A dated, specific standard acts as Ding Fire: it applies pressure while it waits.
• Tie the deliverable to one named problem a person needs solved. That named problem is Jia Wood, the fuel that keeps the fire burning.
• When the draft exists, ask one question — does it meet the criteria? General feedback at that stage is Water; it cools the work before it takes shape.

Starting with clean criteria tends to produce a first version; starting with a conversation tends to keep the project in conversation.

Summer-born Geng (Si, Wu, Wei months)

Summer is the Fire season. The metal is already in the furnace, so the missing element is Water. Water here means completed output or open expression, not rest.

• Make one small finished thing each day that another person can see. A summary, a corrected process, a clear answer — that is output, and output carries heat away.
• When several urgent demands arrive, ask which one is allowed to wait. Each demand you push back on removes one extra fire source instead of adding it.
• If a third urgent project is offered while two are already waiting, ask the requester to rank all three. The ranking turns heat into a decision.

The dependable release for this shape is completion. A small finished deliverable drains more pressure than a long pause does.

Autumn-born Geng (Shen, You, Xu months)

Autumn is the Metal season. A Geng born then is at full strength; the problem is not weakness, it is being stored. The method asks for Ding Fire and Jia Wood.

• Choose a task where an outsider will judge the result. An outside judge is Ding Fire; work no one can reject leaves the metal unused.
• Prefer material that is unfinished: improve a process, rewrite a report, turn a vague request into a scope. That is Jia Wood to keep the fire going.
• Reduce handlers. If your work reaches the decision-maker through two other people, each layer is Earth hiding the blade. Ask to present at the final checkpoint yourself.

When an autumn-born chart has much agreement and no date when someone says no, replace a status meeting with a sample of work.

Winter-born Geng (Hai, Zi, Chou months)

Winter is the Water season. Water in excess freezes the metal, so the list asks for Fire twice: Ding Fire to forge, Bing Fire to warm.

• Put the decision date on the calendar before the research is finished. The date is Ding Fire.
• Explain the analysis to one person at the midpoint. The friction of explaining warms the work.
• Limit the options to two. Five directions is Water; two directions is a decision. Choosing between two and saying no to one is what the Geng blade is for.

Common misreadings

“Geng Metal people are cold and aggressive.”

Geng is a tool, not a temperature. Fire and Water around it set that; the stem alone does not. A direct answer delivered before another person is ready can feel aggressive, even when it is not.

“A Geng Day Master is decisive, so no chart can confuse them.”

Decisiveness is a tendency, not a fixed property. Heavy Water in the chart can produce overthinking; heavy Fire can produce caution. The whole chart decides how the tendency lands.

“If the season’s helper is missing, the chart is bad.”

The seasonal lists are about comfort and use, not quality. A strong Geng may not need its seasonal helper to act; a weaker Geng may benefit from it but still not be determined by it. Strength and weakness are separate questions; the calculator handles them from the full chart.

Where this stops

The Day Master is one stem of eight; the season is one lens. Adding the other pillars, hidden stems, and ten gods changes the picture. This article does not decide whether your Geng is strong or weak; that judgment belongs to the whole chart and is what the calculator gives. The seasonal method describes working conditions, not verdicts. It does not predict health, wealth, marriage, or loss.

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.