What Is Your Day Master? The 10 Heavenly Stems, Explained
If you learn only one thing about your Saju chart, learn your Day Master. Every other judgement — strength, lucky element, the Ten Gods — is measured from it.
How to find your Day Master
The day pillar is calculated from your birth date on the sexagenary (60-day) cycle, independent of month and year. There is no shortcut from your birthday alone — the cycle has run continuously for centuries, so a calculator counts days from a reference date. The free LotusSaju reading shows it in the first screen. If you already have a chart, it is the top character of the third column.
The ten Heavenly Stems
| Stem | Element | Classical image | Core nature |
|---|---|---|---|
| 甲 Gap | Yang Wood | Tall tree | Upright, pioneering, stubborn once rooted. Grows toward goals in straight lines; dislikes being bent. |
| 乙 Eul | Yin Wood | Vine, grass | Flexible, persistent, diplomatic. Climbs by winding around obstacles rather than pushing through. |
| 丙 Byeong | Yang Fire | Sun | Radiant, generous, visible. Energises others; struggles with routine and with hiding feelings. |
| 丁 Jeong | Yin Fire | Candle, lamp | Warm, focused, perceptive. Illuminates a small circle deeply; needs fuel (support) to keep burning. |
| 戊 Mu | Yang Earth | Mountain | Steady, protective, slow to change. A natural anchor for others; can be immovable. |
| 己 Gi | Yin Earth | Field, garden soil | Nurturing, practical, absorbent. Makes things grow; can take on too much of others' weight. |
| 庚 Gyeong | Yang Metal | Raw ore, axe | Decisive, principled, blunt. Cuts through; needs Fire (challenge) to be shaped into a tool. |
| 辛 Sin | Yin Metal | Jewel, needle | Refined, exacting, sensitive to criticism. Shines when polished; sharp under pressure. |
| 壬 Im | Yang Water | Ocean, river | Expansive, intelligent, restless. Moves constantly; depth that others underestimate. |
| 癸 Gye | Yin Water | Rain, mist | Intuitive, adaptable, private. Seeps in quietly; nourishes without announcement. |
The images are not decoration: classical texts reason with them. A 甲 tree needs Water to grow and Metal (pruning) to take shape; a 辛 jewel is ruined by too much Fire; a 壬 ocean needs Earth (banks) to be useful. Much of a reading is this kind of elemental reasoning applied to your own stem.
Strong or weak? The question that follows
Knowing your element is only step one. The reader then asks whether that element is strong (well supported by the month's season and by the other characters) or weak (drained or controlled). A strong Fire person benefits from Water and Metal to spend that energy productively; a weak Fire person needs Wood to feed the flame. Same stem, opposite advice — which is why generic “Fire sign” descriptions miss the point.
The element that restores balance is the yongshin (용신). In practical readings it shows up as the colours, seasons, directions and types of people that tend to go well for you, and the months in a year when decisions land.
Day Master and relationships
The branch under your Day Master is the spouse palace (배우자궁). Its element and its relationship to the stem above it describe what you look for in a partner and how partnership tends to feel. Compatibility readings (궁합) compare two Day Masters first: some pairs generate each other (Wood feeds Fire), some control each other (Water puts out Fire), and the same pair can be a gift or a burden depending on who is strong.
Common misreadings
- Confusing the zodiac animal with the Day Master. “I'm a Dragon” refers to the year branch. The Day Master is a stem, and it is about you personally, not your birth cohort.
- Treating the element as a personality type. Two 丙 people with different supporting characters can be a confident leader and an anxious perfectionist. The stem gives the material; the rest of the chart gives the shape.
- Ignoring yin and yang. 庚 and 辛 are both Metal, but an axe and a needle do not behave alike.
See your own Four Pillars chart
Enter your birth date (and time, if you know it). The free reading shows your Day Master, element balance and lucky element in about a minute.
Get my free reading →Frequently asked questions
Is the Day Master the same as my Chinese zodiac sign?
No. The zodiac animal comes from the year branch and is shared by everyone born that year. The Day Master is the stem of your birth day and is far more individual.
Can my Day Master change?
No — it is fixed by your birth date. What changes over time is the luck cycle (대운/세운) that interacts with it.
Which Day Master is the best?
None. Each has strengths and vulnerabilities, and the quality of a chart depends on balance and support, not on which stem you have.
Why do two calculators give me different Day Masters?
Almost always a date-boundary issue: the Saju day starts at 23:00 (the 子 hour) in classical practice, so a birth at 23:30 can belong to the next day. Time-zone handling can also differ. A reliable calculator states its convention.