The seventh Heavenly Stem — raw Yang Metal sharpened by Fire, directed by Water.
Geng Metal (庚, Gēng) is the seventh of the Ten Heavenly Stems and represents Yang Metal — classically compared to a sword, axe, or unrefined ore that reveals its full value only through Fire and Water refinement. People with Geng as their Day Master tend to be decisive, principled, and resilient under sustained pressure; Wood is the Wealth element (Yi Wood = Direct Wealth, Jia Wood = Indirect Wealth), Ding Fire is the Direct Officer governing career authority, and Water is the Output element governing creativity and talent expression.
In BaZi (Four Pillars of Destiny) and Korean Saju, your Day Master is the Heavenly Stem of the Day Pillar — the single character that most directly represents your core self, your relationship style, and how you process the world. Of the ten possible Heavenly Stems, Geng Metal sits at position seven.
Early Chinese script forms of the character 庚 have been variously interpreted as a tool associated with working metal or an implement linked to the harvest and the West direction. In classical Five Element metaphysics, Geng is described as da jin (large Metal): a mountain cliff face, a great sword, or a raw iron casting. It is not finished or polished — that is the domain of Xin Metal (辛, Yin Metal). Geng Metal is powerful in its natural, unworked state, and that raw quality defines the archetype at every level.
Because Metal controls Wood and is shaped by Fire, the tension between Geng’s natural strength (its cutting power) and its transformation potential (Fire refines it; Water sharpens and directs it) drives many of its most distinctive character contradictions: confident yet brittle under sustained emotional heat; authoritative yet capable of extraordinary refinement when the right elemental conditions appear in luck cycles.
Yang Metal 7th Heavenly Stem Sword / Axe / Raw Ore Season: Autumn Direction: WestThe Day Master describes a baseline character — the lens through which every other element in the chart operates. Geng Metal’s Yang polarity and Metal nature produce consistent tendencies that classical BaZi texts and practitioner observation both confirm.
The Ten Gods (十神, Shí Shén) classify every other Heavenly Stem relative to the Day Master using two rules: which of the five elements it is, and whether its polarity matches the Day Master’s. For Geng Metal (Yang Metal), the assignments are as follows:
| Heavenly Stem | Element / Polarity | Ten God | Primary Domain |
|---|---|---|---|
| 睄 Jiǎ Wood | Yang Wood | Indirect Wealth (偏財) | Variable income, windfalls, father |
| 乙 Yǐ Wood | Yin Wood | Direct Wealth (正財) | Steady income, spouse (in male chart), property |
| 亭 Bĭng Fire | Yang Fire | Seven Killings (七村) | Authority pressure, competitive ambition, risk |
| 丁 Dīng Fire | Yin Fire | Direct Officer (正官) | Career authority, reputation, social discipline |
| 戊 Wù Earth | Yang Earth | Indirect Resource (偏印) | Intuitive skill, unorthodox learning, technical aptitude |
| 己 Jǐ Earth | Yin Earth | Direct Resource (正印) | Education, credentials, mother figure |
| 御 Gēng Metal | Yang Metal | Parallel / Friend (比vai;) | Peers, independence, healthy competition |
| 辛 Xīn Metal | Yin Metal | Rob Wealth (劫財) | Rivals, shared expenditure, siblings |
| 壬 Rén Water | Yang Water | Hurting Officer (伤官) | Unconventional talent, creativity, rule-breaking output |
| 申 Guǐ Water | Yin Water | Food God (食神) | Steady talent expression, enjoyment, sustenance |
In the Five Element control cycle, Metal controls Wood — making Wood the element Geng Metal dominates, and therefore the Wealth element group. The two Wood stems produce distinct Wealth stars:
A strong Geng Metal chart (well-rooted, supported by Earth and Metal) can dominate Wood wealth confidently. A weak Geng Metal chart — overwhelmed by Fire or exhausted by excessive Water Output — may struggle to retain Wood wealth without first establishing Earth (Resource) support. This is the essential reason chart strength must be assessed before any wealth or career recommendation is made.
There is no universal “favourable element for Geng Metal.” The correct answer depends on whether the Day Master is prosperous (well-rooted, strongly supported) or weak (sparse Metal, heavily controlled by Fire, or drained by excessive Water Output).
| Chart Condition | Favourable Elements | Elements to Limit |
|---|---|---|
| Strong Geng Metal (excessive Metal, rooted in Shen or You branch) |
Water (Output — channels strength productively), Wood (Wealth — accumulation), Fire (Officer — authority and refinement) | Earth (Resource — adds to already excessive Metal), Metal (Companion — amplifies excess further) |
| Weak Geng Metal (sparse Metal, controlled by Fire or Wood, no strong root) |
Earth (Resource — produces and protects Metal), Metal (Companion — reinforces the Day Master) | Water (Output — exhausts already weak Metal), Wood (Wealth — weak Metal cannot control it), Fire (Officer — controls and depletes weak Metal) |
Identifying chart strength requires examining the Month Branch (season), the roots present in all four Earthly Branches, and the cumulative weight of all ten characters. The Yong Shen (用神, Use God) — the single element that most balances the chart — can only be pinpointed from the full four-pillar structure.
Geng Metal thrives where decisive execution, clear authority, and measurable results matter. The Fire element governs both Officer stars (Bing Fire = Seven Killings, Ding Fire = Direct Officer), making Fire-related industries or industries that leverage Metal’s cutting precision particularly well-aligned.
| Career Field | Why It Fits Geng Metal |
|---|---|
| Law & Judiciary | Principled decision-making, uncompromising standards, formal authority structures |
| Military & Defence | Hierarchy, decisive command, sustained performance under pressure |
| Surgery & Orthopaedics | Precision cutting (Metal archetype directly expressed), high-stakes environment |
| Civil & Structural Engineering | Metal-dominant field; building hard structures within defined constraints |
| Competitive Finance (Trading, M&A) | Indirect Wealth (Jia Wood) dynamic; decisive action under market pressure |
| Professional Athletics | Physical resilience, direct competition, disciplined training regimes |
| Manufacturing & Supply Chain | Metal industry alignment; structured processes with quantifiable output |
| Law Enforcement & Security | Justice archetype, protective function, clear authority of Metal |
Geng Metal tends to struggle in roles requiring prolonged emotional negotiation, consensus-building without clear outcomes, or creative ambiguity without structure — unless Water (Output) elements are strong in the chart and active luck cycles support them.
The Day Master baseline describes character; what activates or suppresses those qualities is the Luck Cycle (大運, Dà Yùn) — a sequence of ten-year periods derived from the Month Pillar. For a Geng Metal person, the element governing each decade changes the entire equation:
Which decade is currently active, and how annual stems amplify or neutralise it, is the core of a full Saju reading.
Both Geng and Xin are Metal Day Masters, but their polarity reverses every relationship in the Ten Gods table and shapes fundamentally different personalities.
| Geng Metal (御) | Xin Metal (辛) | |
|---|---|---|
| Polarity | Yang (active, outward) | Yin (receptive, inward) |
| Archetype | Sword, axe, unrefined ore | Jewellery, refined metal, gemstone |
| Personality | Direct, confrontational, resilient | Sensitive, aesthetic, strategic |
| Refining agent | Fire shapes it; Water sharpens it | Water washes and brightens it |
| Direct Wealth | Yi Wood (乙, Yin Wood) | Jia Wood (睄, Yang Wood) |
| Direct Officer | Ding Fire (丁, Yin Fire) | Bing Fire (亭, Yang Fire) |
| Seven Killings | Bing Fire (亭, Yang Fire) | Ding Fire (丁, Yin Fire) |
Your Day Master is the Heavenly Stem of the Day Pillar — the third of four columns in a BaZi chart. It is calculated from your solar birth date and local birth time using the traditional Chinese solar calendar (not the lunar calendar). The calculation accounts for time zones and the solar term boundaries that define each month.
If your Day Stem shows 庚 (Geng), you are a Geng Metal Day Master. If you were born near midnight or close to a solar term boundary (typically around the 6th–8th of each Gregorian month), verifying the exact birth time matters — a difference of even one hour can shift the Day Pillar entirely and change the Day Master.
Neither — “strong” and “weak” in BaZi describe the Day Master’s rooting and support within the specific chart, not its element or polarity in isolation. Geng Metal born in autumn (Shen 申 or You 酉 month) tends toward strength because Metal is in season and the Month Branch often provides a root. Geng Metal born in summer (Si 己 or Wu 午 month) is under direct Fire pressure and typically weaker. Only the full eight-character chart — all four pillars plus the luck cycle — determines actual strength.
Fire (Bing and Ding) represents both Officer stars for Geng Metal — the force that imposes structure, shapes raw Metal into a useful instrument, and governs career authority. A chart with no Fire lacks the Officer element entirely, which in classical texts correlates with self-directed work preferences and reduced external institutional structure. However, Fire can enter through ten-year luck cycles or annual stems. A strong Geng Metal chart without Fire may actually benefit temporarily from that absence — avoiding excess control when the Day Master is already overwhelmingly strong. Whether the absence is a problem or an advantage is always chart-specific.
Yes, under the right conditions. Water is the Output element for Geng Metal (Ren Water = Hurting Officer, Gui Water = Food God). Strong Output in a well-balanced chart supports careers in writing, research, consulting, teaching, or any field where expertise is communicated and monetised. The critical requirement is that Wood (Wealth) must also be present in the chart or active in the luck cycle to receive that output and convert it into income — otherwise, talent is expressed but not compensated. A Geng Metal chart strong in Water and Wood but weak in Officer stars is often found in independent practitioners and entrepreneurs rather than salaried employees.
BaZi relationship compatibility is not a simple Day Master pairing. Proper analysis examines both parties’ Day and Month pillars, the spouse star (Direct Wealth star for a male chart, Direct Officer star for a female chart), and whether the partner’s chart supplies the missing favourable element. For a weak Geng Metal chart that lacks Earth support, a partner whose chart carries Ji Earth (Direct Resource) or Wu Earth (Indirect Resource) can be naturally stabilising — but this is chart-specific, not a universal compatibility rule. The spouse palace (Day Branch) also carries significant weight that a Day Master analysis alone cannot reveal.
A basic chart lookup shows the four pillars and labels the Ten Gods. A full Saju reading from Cheonmyeongdang adds: chart strength assessment (strong or weak Day Master, which reverses the entire favourable element list); Yong Shen identification (the pivotal balancing element for this specific chart); current and upcoming ten-year luck cycle analysis with year-by-year colour; spouse, wealth, and career star depth readings; and the interaction between annual stems and the natal chart. Results are delivered instantly after payment and are accessible via email confirmation.
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