BaZi day master · 6 of 10
Yin Earth Day Master (己土) in BaZi
己 is yin earth — the field, the garden soil, the earth in a pot. It is read as cultivation: patience, accommodation, and giving other things the conditions they need to grow. If your day pillar begins with 己, this is the character the rest of your chart is measured against.
The short version
己 is the most accommodating of the ten stems — and that is a description, not a compliment.
What makes 己 flexible is the same thing that makes it easy to overlook: it is read by what it produces, not by what it is.
Is your day master 己?
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Enter your birth date — nothing else is required for this answer. If the result comes back with a different stem, the profile for it is one click away at the bottom of the page.
How it’s calculated
- 1
Take the day pillar
The day pillar advances exactly one step per calendar day with no gaps and no leap corrections. That continuous count is what makes it reliable: it does not depend on the calendar reform, the timezone or the season.
- 2
Read its heavenly stem
The stem of that pair is the day master. 己 is the 6th of the ten stems, so “is my day master 己?” reduces to one question about one character — and it can be answered from the date alone.
- 3
Set it as the reference
Once 己 is fixed, the other seven characters stop being a list and become relationships. Every stem in the chart is named by how it stands to 己 — that is the table on this page, and it is different for each of the ten stems.
The full rule set — every convention, in order, with the engine field names — is published on the methodology page.
What 己 means as a day master
己 is earth at yin: the worked field, the loam, the soil in a container. Unlike 戊, which is the ground things stand on, 己 is the medium things grow in. Classical practice reads it as receptivity and patience — a chart that adapts its conditions to whatever it is carrying.
The cost inside the image is legitimate and classical texts do not hide it. Soil is defined by what it grows; a 己 chart with nothing planted in it reads as untapped rather than as stable. This is why 己 is often read alongside wood: wood is what turns a field into a harvest, and its absence is more noticeable here than in most charts.
The ten gods, read from 己
The ten gods are not ten things — they are five relations, each of which comes in two polarities, and the relation is always measured from the day master. With 己 as the reference the five relations resolve as follows: 土 itself is the Peer, Fire generates 土 and is the Resource, Metal is what 土 produces and is the Output, Water is what 土 controls and is the Wealth, and Wood is what controls 土 and is the Officer.
The table below is produced by the engine from that rule alone — the element relation, multiplied by whether the two stems share a polarity. Nothing in it is memorised and nothing in it is interpreted. This is the reason a chart can be re-read by anyone: change the day master and all ten names change at once, in a way that is checkable rather than a matter of opinion. On the chart in the worked example below, 己 is the day stem itself, so the four visible stems around it each carry one of these names.
What feeds 己, and what spends it
A chart is not read by counting elements — it is read by what each element does to the day master. Fire (丙 丁) generates 土, so it is the Resource: what supplies 己 without being asked. 戊 己 is the Peer. Metal (庚 辛) is what 土 produces, so it is the Output: energy that leaves as work, expression or craft. Water (壬 癸) is what 土 controls, so it is the Wealth. Wood (甲 乙) is what controls 土, so it is the Officer — the element that acts on 己 and therefore carries the chart's pressure.
Five relations doubled by polarity gives the ten gods, and that is the whole structure. What it does not give you is a verdict on whether 己 has enough support, because that judgement depends on how much you weight the month of birth, whether hidden stems count fully, and whether rootedness outranks raw count — and three competent practitioners can disagree. So we print the counts and the support/drain split, and leave the weighing to the reading rather than hiding a weighting model inside a score.
Where 己 turns up in the branches
己 appears inside three branches: 丑 and 未, where it is the primary hidden stem, and 午, where it is a secondary one. So yin earth is concentrated in the transitional branches at the end of winter and summer rather than in one seasonal position.
This matters more than it sounds. Four of the eight characters in a chart are branches, and each branch conceals between one and three stems, so a chart can hold 土 energy in a form that never appears on the surface. The list below is generated from the same fixed hidden-stem table the calculator uses — you can check it branch by branch.
The common misreading
己 is frequently read as "weak earth" next to 戊, which misses the point. They are not the same thing in different sizes; one is a surface and the other is a medium. The real risk with 己 is not weakness but vagueness — a chart that takes the shape of its contents can be described accurately without ever being described specifically.
A worked example
Every page on this site that needs a worked example uses the same approach: a real birth moment, run through the engine at build time, with the numbers printed so you can reproduce them. This page's example is 3 February 1990, Taipei.
Input
- Date
- 3 February 1990
- Time
- 10:00
- Place
- Taipei, Taiwan
- Time zone
- Asia/Taipei
Nearest 节
Next: 立春1990-02-04 · 10:14
Year pillar 己巳 — this date is before 立春, which is what sets it.
Day master of this chart
己 — Yin Earth
Day pillar 己亥 · 纳音 平地木 · image the field
All four pillars, computed at build timeyear · month · day · hour
Year 年
己巳
大林木
Month 月
丁丑
涧下水
Day 日
己亥
平地木
Hour 时
己巳
大林木
- Woodabsent
- Fire338%
- Earthself450%
- Metalabsent
- Water113%
Surface tally 8 of 8 — and no Wood, no Metal at all. Support 7, drain 1, counted across the four stems and four branches and not weighted by season. A single absent element is a fact about this one chart, not a verdict on it.
Ten consecutive days, ten day masters
3 February 1990 gives 己巳 丁丑 己亥 己巳 — the day pillar is 己亥, so the day master is 己. It belongs to a run of ten consecutive dates, 30 January to 8 February 1990, which produce all ten day masters exactly once, because the day pillar advances one step per calendar day and ten steps cycle through all ten stems. That same run straddles the exact minute 立春 fell in 1990 (4 February, 10:14 local), so the earlier dates sit in the 己巳 year and the later ones in the 庚午 year — which also flips the luck-pillar direction, since direction follows the year stem's polarity. On this chart the surface tally is Wood 0 · Fire 3 · Earth 4 · Metal 0 · Water 1 — support 7, drain 1, and the luck pillars run backward from 丙子.
Engine v1.1.0 · lunar-javascript@1.7.7 · these four pillars and this tally reproduce exactly from the input above, in your browser or ours.
The full stem map, computed
These ten names are not a list to memorise — they are computed by one rule: the element relation between the two stems, multiplied by whether their polarities match. The table is produced by the engine from that rule, and it changes completely the moment the day master changes away from 己.
Peer
Same element as the day master
- 戊劫财 · Rob Wealth
- 己比肩 · Companion
Output
What the day master produces
- 庚伤官 · Hurting Officer
- 辛食神 · Eating God
Wealth
What the day master controls
- 壬正财 · Direct Wealth
- 癸偏财 · Indirect Wealth
Officer
What controls the day master
- 甲正官 · Direct Officer
- 乙七杀 · Seven Killings
Resource
What produces the day master
- 丙正印 · Direct Seal
- 丁偏印 · Indirect Seal
己 against itself is a Peer of the same polarity, so it is always Companion 比肩. The other nine stems divide across the five relations with two in each — which is why there are exactly ten names and never eleven.
The hidden-stem table, filtered to 己
A stem does not have to appear on the surface of a chart to be present — every branch carries one to three hidden stems, and this is where the engine finds them. The list below is generated from the same fixed table the calculator uses.
- 丑Ox · Chǒu土 · late winterprimary hidden stem
- 午Horse · Wǔ火 · midsummersecondary hidden stem
- 未Goat · Wèi土 · late summerprimary hidden stem
丑 未 carry it as the primary hidden stem; 午 carry it as a lesser one. A lesser position is not a weaker claim on the element — position matters for weighting, and weighting is the step where published schools disagree.
The other nine day masters
Each stem has its own page, and they are read against each other rather than in isolation — 甲 against 乙, 丙 against 丁. Whichever one is yours, the comparison is usually where the meaning is.
Questions
- What does a Yin Earth day master mean?
- 己 is earth at the yin pole: the field rather than the mountain. The chart is read for cultivation and adaptability — what it is growing, and whose conditions it is providing. It is a classical starting material, not a personality result.
- Is 己 weaker than 戊?
- No. 戊 is a surface and 己 is a medium; the polarity describes orientation, not size. Classical strength judgements look at the month of birth, the roots in the branches and the balance of support and drain — all of which we print as raw counts instead of collapsing into a score.
- Why is 己 associated with being overlooked?
- Because soil is read by its yield. The classical image is a medium rather than an object, so a 己 chart with strong output reads clearly and one without a crop reads blankly. That is a statement about the whole chart, and it is the reason 己 is usually discussed together with what the chart produces.
- What does 己 relate to in the ten gods?
- Fire generates earth, so 丙 and 丁 are Resource. Earth generates metal, so 庚 and 辛 are Output. What 己 produces and what it controls are both listed on this page, computed against 己 rather than quoted — change the day master and every one of those ten names changes.
Next
Day master calculator
Find which of the ten stems is yours, and read all ten profiles side by side.
OpenYang Metal day master (庚)
庚 is metal before it is finished — valued for what it can be put to, not for polish.
OpenFive elements calculator
See how much 土 your own chart carries, and what supports or drains it.
OpenFull chart
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The calculator is free and needs no account. It shows all four pillars, hidden stems, ten gods, your element balance and ten-year luck cycles — with the engine version on the result.
BaziPattern provides AI-generated readings for entertainment and cultural exploration purposes only. Readings are not predictions, or medical, legal, or financial advice.