Day Master: The Ten Heavenly Stems
The Day Master (日主) is the heavenly stem of your day pillar in a BaZi chart: the character that stands for you, against which every other character is read.
| Stem | Element | Archetype | In one line |
|---|---|---|---|
| 甲 Jia | Yang Wood | The Oak | Upright, principled, built to grow slowly and stand for decades. |
| 乙 Yi | Yin Wood | The Vine | Adaptable and quietly persistent: you find the way around, not through. |
| 丙 Bing | Yang Fire | The Sun | Warm, generous, impossible to ignore when you walk in. |
| 丁 Ding | Yin Fire | The Candle | Focused, perceptive, warm up close rather than from a stage. |
| 戊 Wu | Yang Earth | The Mountain | Steady, protective, the person everyone leans on. |
| 己 Ji | Yin Earth | The Field | Nurturing and practical; you make things grow around you. |
| 庚 Geng | Yang Metal | The Sword | Decisive, loyal, direct to the point of bluntness. |
| 辛 Xin | Yin Metal | The Jewel | Refined, sensitive, with high standards for yourself and others. |
| 壬 Ren | Yang Water | The Ocean | Big-picture, restless, full of ideas and motion. |
| 癸 Gui | Yin Water | The Rain | Intuitive, gentle, quietly influential. |
How to find your Day Master
Find the day pillar for your birth date (adjusted to local solar time, with births after 23:00 counted as the next day). Its first character is your Day Master. Your free Joss Profile does this for you, including the solar-time correction.
Why it matters
Every other stem in the chart becomes a role relative to the Day Master: the ten gods. The same 庚 Metal is "Authority" to an 乙 Wood person and "Peer" to a 庚 person. That is why two people with the same zodiac sign can have very different charts.
Day Master, element and archetype
On askjoss each Day Master has an English archetype, from The Oak (甲) to The Rain (癸), printed on your Fate Receipt with your zodiac sign and favorable element. The archetype is a plain-language summary of the classical image of the stem; the element balance and strength score tell you how strongly it shows in your chart.
Yin and yang pairs
The ten stems are five elements in a yang and a yin form. Yang stems (甲 丙 戊 庚 壬) are read as outward and direct; yin stems (乙 丁 己 辛 癸) as adaptive and inward. Neither is better; they describe style.
How askjoss computes it
We compute the day pillar from a continuous 60-day count anchored on a known date, after converting your birth time to true solar time. We describe each stem with an English archetype, from The Oak to The Rain, as our plain-language layer on top of the classical meaning. Full notes, including every simplification, are on How we calculate.
Common misconceptions
- "My Day Master is my year element." The year element (as in "Fire Goat") describes the year; the Day Master comes from the day.
- "A strong Day Master is better." Strength describes balance, not quality; strong and weak charts simply need different elements.
Sources
- 《淵海子平》: established reading the chart from the day stem.
- 《滴天髓》: classic verses on the nature of each of the ten stems (十干論).
Related: What is BaZi? · Five elements · Tong Shu almanac · Da Liu Ren · Qi Men Dun Jia · Zodiac clashes (Tai Sui)
Frequently asked questions
What is a Day Master in Chinese astrology?
The heavenly stem of the day you were born, used in BaZi as the symbol of the self.
How many Day Masters are there?
Ten, one for each heavenly stem: 甲 乙 (Wood), 丙 丁 (Fire), 戊 己 (Earth), 庚 辛 (Metal), 壬 癸 (Water).
Can my Day Master change?
No. It is fixed by your birth day. What changes is how each year and luck cycle interacts with it.
askjoss presents Chinese metaphysics as cultural tradition and a tool for self-reflection. It is not medical, legal, financial or psychological advice, and no reading can promise an outcome.