Zi Wei Dou Shu (紫微斗數, sometimes rendered Purple Star Astrology) is a Chinese astrological system built around a grid of twelve palaces. Your birth date and hour fix where the grid starts; from there, fourteen major stars and a large cast of minor ones are placed into the palaces by rule. It is a different system from BaZi — same culture, same calendar, entirely different machinery — and the two are often read side by side rather than in competition.
Unlike Western astrology, the houses are not fixed to the horizon — the whole grid rotates depending on your birth month and hour. The first palace to be located is the Life palace (命宮), and every other palace is counted from it in a fixed order. This is why the birth hour matters so much here: shift the hour and the entire grid rotates, so the same stars land in completely different areas of life.
The fourteen major stars are not planets and have no astronomical positions. They are placed by calculation from the lunar date, the hour, and the chart's Five Element Class (五行局). This is worth being clear about: nothing in a Zi Wei chart is looked up in an ephemeris. The system is a formal structure applied to a birth time, and its authority is traditional rather than observational.
A great deal of Zi Wei reading comes from the fact that certain stars are permanently locked in relation to each other. 七殺, 破軍 and 貪狼 always sit at 120° — find one and you know where the other two are. Because of these fixed relationships, a chart is read in triangles and axes rather than palace by palace.
Every major star is graded for how well it sits in the branch it landed in, on a seven-step scale from 廟 (exalted) down to 陷 (fallen). The grading is a property of the star-and-branch pair, so it is fully determined once the chart is drawn — there is no interpretation involved in producing it, only in reading it.
Every palace is read together with the palace directly facing it, six positions away. Roughly half of all charts have at least one palace with no major star in it at all; such a palace is not empty in practice, it borrows the stars from the palace opposite. A chart with an empty Life palace is completely normal and is read through what sits across from it.
Zi Wei is considerably more hour-sensitive than BaZi. Without a birth hour you cannot reliably place the Life palace, which means the entire grid is unfixed and the reading is not merely less detailed but structurally unavailable. If you do not know your hour, BaZi will give you more that is trustworthy than Zi Wei will.
Every chart has these twelve, always in this order. The Life palace is located first from the birth month and hour; the rest follow from it.
| Palace | What it covers |
|---|---|
| Life 命宮 | The palace the whole chart is read from. Temperament, the shape of a life, the person's default setting. |
| Siblings 兄弟 | Brothers and sisters, and by extension peers, colleagues and the people you stand level with. |
| Spouse 夫妻 | Marriage and long partnerships — both what you look for and what you tend to attract. |
| Children 子女 | Children, but also what you produce and pass on: students, projects, the next generation of anything. |
| Wealth 財帛 | How money arrives and how it behaves once it does. Not how much. |
| Health 疾厄 | Constitution and the body's habitual weak points; also stress and how it lands. |
| Travel 遷移 | Movement, being away from home, and how you are received by strangers. |
| Friends 僕役 | Subordinates, staff, wider social circle — the people who are neither peers nor family. |
| Career 官祿 | Work, position and reputation. Historically the palace of office-holding. |
| Property 田宅 | Land, home and the physical places you accumulate; also family stability. |
| Fortune 福德 | Inner life — what actually makes the person content, and what they enjoy spending on. |
| Parents 父母 | Parents and elders, and by extension bosses, mentors and institutional authority. |
Seven steps, strongest first. The grade is fixed by the star-and-branch pair, so producing it involves no interpretation — only reading it does.
| Grade | Meaning |
|---|---|
| 廟 Exalted | The star is in its own temple. Everything it is good at works with the least friction here — and so does everything it overdoes. |
| 旺 Strong | Clearly well placed. The star's qualities show plainly and hold up under pressure. |
| 得 Favourable | Comfortable but not commanding. The star works, without the surplus that exalted placements bring. |
| 利 Advantageous | Workable. The star gets its job done, usually by leaning on whatever else is in the palace. |
| 平 Neutral | Neither helped nor hindered. The reading depends almost entirely on the company the star keeps. |
| 不 Weak | The star is out of its element. Its strengths are muted; its habits are not. |
| 陷 Fallen | The hardest placement. Classically read not as failure but as the star's qualities arriving in the wrong form — the drive without the direction, the sharpness without the target. |
Certain stars are locked in fixed relation to each other, which is why charts are read in triangles and axes rather than one palace at a time.
紫微 · 天府 · 廉貞 · 武曲 · 天相
Five stars concerned with position, structure and holding things together. They read as authority, administration and accumulated resource. Charts weighted here tend to build institutions, or work comfortably inside them.
七殺 · 破軍 · 貪狼
These three always sit 120° apart, so they are permanently in each other's company — wherever one is, the other two are triangulated to it. Together they are the chart's appetite for change: the drive to break, rebuild and want. Lives weighted here move in cycles rather than lines.
天機 · 太陰 · 天同 · 天梁
Classically the civil-service combination — the stars of thinking, tending, easing and sheltering. They do their best work in a defined role with something worth protecting, and their common failure is drift when nothing is asked of them.
太陽 · 巨門
Light and the gate it shines through. Both stars are about being seen and being heard — one by giving out, one by speaking up — and both carry the cost of visibility: exhaustion for one, dispute for the other.
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