Wu (戊) is the fifth heavenly stem and the yang form of Earth. If Wu is your Day Master, it is the stem above your day pillar, and it functions as the fixed point the rest of the chart is read from.
Wu Earth is the Yang form of Earth, one of the ten Day Masters. New to this? Start with what a Day Master is and how it is calculated.
Wu is the mountain: mass that does not move, weather that does not reach the interior. It is the stem most associated with reliability in the literal sense — a commitment from Wu is treated by everyone involved as a settled fact, including by Wu.
People put their back to a mountain. Wu charts often show someone who became load-bearing early, was good at it, and consequently was never asked whether they wanted the job. There is real satisfaction in this and also a certain amount of unexamined obligation.
Mountains do not move, which is the whole problem. Wu's lifelong lesson is flexibility — not abandoning its position, but recognising the difference between a foundation and a rut. The classical warning is that Earth without movement becomes stagnant rather than stable.
Earth is produced by Fire and controls Water; Wood controls it and Metal drains it. For Wu this means Fire is support and learning, Water is wealth, Wood is authority and pressure, and Metal is output and expression. Earth is also the pivot of the cycle — it sits at the close of every season — which is why Earth Day Masters often read as the steadying element in charts that would otherwise swing.
These relationships are the Ten Gods (十神). They are not personality labels — they describe what another stem does to your Day Master when it appears in your chart. This table is generated from the same function the chart tool uses, so it matches what the calculator would tell you.
| Stem | Relation to Wu Earth | What it does to Wu Earth |
|---|---|---|
| Jia Wood 甲 | Seven Killings 七殺 | Wood cuts at mountain and thick soil — pressure that asks no permission. |
| Yi Wood 乙 | Direct Officer 正官 | Wood shapes mountain and thick soil — structure you accept. |
| Bing Fire 丙 | Indirect Resource 偏印 | Fire feeds mountain and thick soil unevenly — sideways insight. |
| Ding Fire 丁 | Direct Resource 正印 | Fire feeds mountain and thick soil steadily — support and schooling. |
| Wu Earth 戊 | Friend 比肩 | A true peer for mountain and thick soil; a rival for the same ground. |
| Ji Earth 己 | Rob Wealth 劫財 | Earth of the other polarity beside mountain and thick soil — money leaves through people. |
| Geng Metal 庚 | Eating God 食神 | mountain and thick soil outputs Metal easily — talent that flows. |
| Xin Metal 辛 | Hurting Officer 傷官 | mountain and thick soil outputs Metal sharply — brilliance that cuts. |
| Ren Water 壬 | Indirect Wealth 偏財 | mountain and thick soil works Water in lumps — windfalls, not salary. |
| Gui Water 癸 | Direct Wealth 正財 | mountain and thick soil works Water steadily — earned in proportion to effort. |
What each of the ten relations means in general — Direct Wealth, Seven Killings, Hurting Officer and the rest — is set out in the Ten Gods glossary.
Classical BaZi grades a stem by the season it was born into. Earth is a special case: it rules the last month of every season (辰未戌丑) rather than a season of its own, which is why Earth Day Masters are rarely at either extreme.
| Birth season | Grade | What it does to Wu Earth |
|---|---|---|
| Spring (寅卯辰 · Feb–Apr) | 死 Weakest | Wood breaks the mountain open. Wu born in spring meets resistance early, and Fire is what restores it. |
| Summer (巳午未 · May–Jul) | 相 Supported | Fire bakes the mountain solid. Well-supported and productive — the easiest season for Wu. |
| Autumn (申酉戌 · Aug–Oct) | 休 Resting | Earth spends itself producing Metal. Giving out steadily, with less coming back. |
| Winter (亥子丑 · Nov–Jan) | 囚 Confined | Cold mass, waterlogged. Stable but inert; warmth is the missing ingredient. |
Earth corresponds to Yellow / brown, the numbers 5, 0, and the direction Centre. These are traditional correspondences for the element itself. They are not a prescription — whether Earth is helpful to you depends on your whole chart, not on your Day Master alone.
11 April 2001, born in Kuala Lumpur — day pillar 戊辰 (Wu Chen).
The day stem is 戊, sitting on 辰 — an Earth branch — in the month of 辰 itself. That is Earth on Earth in an Earth month, which classical texts would call rooted to the point of immobility. The reading is not automatically favourable: too much of one element is its own imbalance, and here Wood as a controlling force would be doing useful work rather than causing harm.
How the day pillar is derived — solar terms, true solar time and the late Zi hour — and what a Day Master cannot tell you on its own, are covered on what is a Day Master.
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