The ten day masters, one page each
Your day master is the heavenly stem of your day pillar — the single character the tradition reads as the centre of the chart. Ten stems, five elements, two polarities. The differences between the two stems of an element are larger than most summaries admit.
What a day master is, and what it is not
The day pillar is the third of the four pillars, and its upper character — the heavenly stem — is the day master. Everything else in the chart is read in relation to it: the other stems become ten gods (output, wealth, pressure, resource), the branches become hidden support or drain, and the month decides how much of that support is actually available in season.
It is not a personality type. The tradition treats the day master as a centre of gravity, not a label: two people with the same stem and completely different charts will read differently, which is the point of charting rather than sorting.
The ten stems
| Stem | Name | Element | Image | |
|---|---|---|---|---|
| 甲 | Jia | Wood · Yang | the tall tree | Read → |
| 乙 | Yi | Wood · Yin | the vine and the grass | Read → |
| 丙 | Bing | Fire · Yang | the sun | Read → |
| 丁 | Ding | Fire · Yin | the lamp and the candle | Read → |
| 戊 | Wu | Earth · Yang | the mountain | Read → |
| 己 | Ji | Earth · Yin | cultivated soil | Read → |
| 庚 | Geng | Metal · Yang | the axe and the raw ore | Read → |
| 辛 | Xin | Metal · Yin | the jewel and the fine blade | Read → |
| 壬 | Ren | Water · Yang | the great river and the sea | Read → |
| 癸 | Gui | Water · Yin | rain, dew and the deep well | Read → |
Yang and yin are not masculine and feminine
The two stems of an element are usually introduced as its yang and yin versions, which is accurate and almost useless until it is unpacked. What the polarity describes is mode: yang stems work by force, scale and directness; yin stems work by discrimination, proximity and persistence. An axe and a scalpel are both Metal. A river and a well are both Water.
The practical consequence is that picking the right stem page matters more than picking the right element page. A Geng is not a stronger Xin, and a Ren is not a bigger Gui.
Finding yours
You need your birth date, and your birth time if you want the hour pillar. The day master itself is stable across the day, with one exception the tradition cares about: charts change day at 23:00, not at midnight, so a birth at 23:30 belongs to the next day. Our calculator applies the 23:00 boundary and true solar time by default, and the method page documents both.
Enter a date, a time and a birthplace. The calculator returns the four pillars, the weighted element balance and your day master.
Find my day masterQuestions people actually ask
What if I do not know my birth time?
You can still find your day master. The day pillar depends on the date and on the 23:00 boundary, not on the hour — so an unknown hour costs you the fourth pillar and the precision of the element balance, not the day master itself.
Is the day master the most important part of a chart?
It is the centre, not the whole. The tradition reads the day master against the month first, then against the rest of the chart. A strong day master with no outlet and a weak one with excellent support are both workable; a chart is never a single character.
Do the ten gods change with the day master?
Yes — that is what makes them relational. The same branch is 正官 (Direct Officer) for one day master and 七杀 (Seven Killings) for another, because the ten gods are defined by the relationship to the day stem: what it produces, what it controls, what controls it, what feeds it.
BaZi is a traditional cultural system used here for reflection and study. Nothing on this page is a prediction about a specific person, a medical opinion, or financial advice. Element correspondences to organs come from classical Chinese medicine and are mentioned to explain the imagery, not to diagnose anything.