Zi Wei Dou Shu (Purple Star Astrology)

Zi Wei Dou Shu (Purple Star Astrology) is one of the two great systems of traditional Chinese astrology, named alongside BaZi. Its approach differs sharply: where BaZi uses four pairs of stems and branches and reads life through the Five Elements, Zi Wei takes more than a hundred stars, led by the Zi Wei (Emperor) star, and sets them into twelve palaces fixed by birth time, then reads human affairs from the star combinations, their brightness, and the flow of the Four Transformations. A finished Zi Wei chart is like a star map that lays out twelve domains of a life at once — the self, wealth, career, marriage, children and the rest. To understand Zi Wei is to understand the four layers of that map: palaces, stars, transformations and cycles.

The skeleton of the chart: the twelve palaces

The chart is a grid of twelve cells, each a palace standing for one domain of life. Counter-clockwise from the Life Palace they run: Life (self, character), Siblings, Spouse (marriage), Children, Wealth, Health, Travel (the world outside, journeys), Friends (once called Servants — peers and subordinates), Career, Property (home, real estate), Wellbeing (the inner life), and Parents.

Which cell the Life Palace lands in is fixed by the birth month and hour; once it is set, the other eleven follow in order, and each palace's own stem is fixed with them. Besides the Life Palace there is a Body Palace, overlapping it or standing apart, which speaks of acquired effort and the later half of life.

A reading never looks at one palace alone. The unit is the three harmonies and opposition: the palace itself, plus the palace directly opposite, plus the two trine palaces — a group of forces answering one another. To judge a matter, all three must be read together — a fine Life Palace loses some of its promise if its opposite palace clashes; a plain Wealth Palace need not mean a narrow path if auspicious stars gather in its trines.

The stars: major, support, malefic and minor

The palaces are the stage; the stars are the players. Zi Wei casts over a hundred, in several ranks.

The fourteen major stars are the leads, in two families. The Zi Wei family of six: Zi Wei, Tian Ji, Tai Yang, Wu Qu, Tian Tong, Lian Zhen. The Tian Fu family of eight: Tian Fu, Tai Yin, Tan Lang, Ju Men, Tian Xiang, Tian Liang, Qi Sha, Po Jun. They distribute across the twelve palaces by one fixed rule — which one sits in the Life Palace, and which majors share or face it, is where a reading begins. That rule starts from the Five-Phase Bureau; the next section walks through it. A star reads brighter or dimmer by palace, graded exalted, prospering, favorable, fallen and so on; exalted, its force shows, fallen, it weakens.

The six auspicious and six malefic stars are the key supporting cast. The six auspicious: Zuo Fu, You Bi (help), Wen Chang, Wen Qu (learning), Tian Kui, Tian Yue (benefactors). The six malefic: Qing Yang, Tuo Luo (injury, drag), Huo Xing, Ling Xing (haste, the sudden), Di Kong, Di Jie (dispersal, loss). Beyond these, Lu Cun and Tian Ma govern wealth and movement.

The minor stars and spirits number in the hundreds — Hong Luan and Tian Xi (romance and joy), Tian Yao (allure), Hua Gai (solitary refinement), Long Chi and Feng Ge (skill and taste) — fine brushes that tint each palace toward fortune or trouble. A professional chart also lays out spirit sequences such as the twelve life stages and the Bo Shi twelve. Many as the stars are, a reading keeps its order: majors set the frame, the auspicious and malefic add color, the minors are footnotes.

How the fourteen majors are placed: start with the Bureau

The section above said the fourteen majors fall into place "by fixed rules". So what is the rule?

In one line: of the fourteen majors, only Zi Wei's seat has to be worked out — the other thirteen all follow from it. And where Zi Wei lands is decided by two things: the Five-Phase Bureau and your lunar day of birth.

The whole chain looks like this, walked through below on a real chart:

Step one: get the Bureau from the Life palace

The Bureau is simply the Na Yin phase of the Life palace's stem and branch. Once the Life palace is fixed, take its stem and branch, look up their Na Yin, and the phase you get is the Bureau. Each of the five carries a number, and that number is what the next step needs:

In the chart above, the Life palace sits at Chou with the stem-branch Ji Chou, whose Na Yin is Thunderbolt Fire — Fire, and therefore Fire 6, giving n = 6.

Step two: work out Zi Wei from the Bureau number and the lunar day

This is the only place in the whole section where you actually have to calculate, and the rule is rigid.

Let d be the lunar day of birth (1st to 30th — the lunar day, not the solar date), and n the Bureau number.

1. Quotient q — divide d by n and round up: q = ⌈d ÷ n⌉. Plainly: how many Bureau-numbers it takes to reach d.
2. Remainder r — r = q × n − d. Note this is not an ordinary remainder: it is how far past d those q Bureau-numbers overshoot.
3. Base palace — count q palaces clockwise from Yin (Yin itself counts as the first).
4. Shift by r — if r is even, carry on forwards r palaces; if r is odd, turn around and go backwards r palaces; if r = 0, stay put. Where you land is Zi Wei.

Taking the same chart: the 23rd lunar day of the fifth month, so d = 23; Fire 6, so n = 6.

• q = ⌈23 ÷ 6⌉ = 4
• r = 4 × 6 − 23 = 1
• Count 4 from Yin: Yin (1) → Mao (2) → Chen (3) → Si (4), so Si is the base palace
• r = 1 is odd, so step back one: Si → Chen

Zi Wei lands in Chen — exactly where this site places it. Drawn out, those two counting moves look like this:

Step three: the other thirteen follow Zi Wei and Tian Fu

With Zi Wei seated, the other thirteen are not worked out separately — they follow two heads, which is also why the fourteen majors are grouped into two families at all.

The Zi Wei family of six runs backwards from Zi Wei at fixed intervals: Zi Wei and Tian Ji sit next to each other; one palace on come Tai Yang, Wu Qu and Tian Tong in a row; two palaces further sits Lian Zhen.

Tian Fu's seat follows from Zi Wei's: the two are symmetric about the Yin–Shen axis (in the Yin or Shen palace the two share a seat). With Tian Fu placed, its family of eight runs forwards: Tian Fu, Tai Yin, Tan Lang, Ju Men, Tian Xiang, Tian Liang, Qi Sha, and then Po Jun three palaces on.

So the fourteen majors have only one degree of freedom — fix Zi Wei and the whole relative arrangement is fixed with it. Two people whose Zi Wei shares a palace have exactly the same layout of majors; only the palace names and the transformations differ.

With all fourteen seated, the chart looks like this — the two families in different colours, the two heads underlined:

Put another way, Zi Wei and the Na Yin of BaZi are not two unrelated systems: where your chart starts depends on the Na Yin of your Life palace. It is also why anyone who already knows Na Yin picks up Zi Wei faster.

Si Hua: the soul of Zi Wei Dou Shu

If palaces and stars are the static skeleton, the Four Transformations are the mechanism that brings the chart to life. The heavenly stem of the birth year makes four stars each "transform" into one of Lu, Quan, Ke or Ji. Which four depends entirely on your year stem — a Jia year gives Lian Zhen the Lu, an Yi year hands it to Tian Ji instead. All ten stems are laid out below:

• Hua Lu — smoothness, resources, income, affinity;
• Hua Quan — control, capability, standing, expansion;
• Hua Ke — reputation, documents, benefactors, ease;
• Hua Ji — fixation, obstruction, debt, entanglement.

Where these four fall, like four brushes, sketches the gains and the lessons of a life — Hua Lu in the Wealth Palace favors income, Hua Ji in the Spouse Palace ties the affections in knots. This set, fixed by the birth-year stem, is the birth-year Si Hua, the innate given (the "body").

The cycles: decade, year and month

The natal chart is the innate ground; the cycles lay time on top, showing the rise and fall of each stage. The decade cycle moves one palace per ten years, running forward or backward from the Life Palace by rules of sex and year-polarity, each decade with its own re-mapped palaces and transformations. The annual cycle changes yearly — the palace on the year's branch becomes that year's Life Palace, and brings its own transformations. Below it come the month, day and hour cycles, dividing time ever finer. They are not started afresh — each hangs off the one above.

First the annual chart fixes the Dou Jun: which palace holds that year's first lunar month. (Count the first month backwards from the palace of the year branch to your birth month, then count the Zi hour forwards from there to your birth hour.) With the Dou Jun set, the month cycle runs one palace per month from there; the day cycle runs one palace per day from the month's palace; the hour cycle runs from the day's palace. Each layer carries its own palace stem, and so its own set of Four Transformations — which is why a single natal chart can be read at so many grains.

The Zi Wei chart at Guanyitang lets you switch through all six: natal, decade, year, month, day and hour.

The traditional order is "decade first, then year": the decade sets the broad climate of ten years, the year the concrete circumstances of that year, and only laid over the natal chart do fortunes come to rest on something real.

The San He and Fei Xing schools

Zi Wei has its own lineages, chiefly two. The San He school (the star-based school) casts all hundred-odd stars and reads from the birth-year transformations, the structure of the three harmonies and opposition, and the star combinations, dwelling on star qualities and chart patterns — the form most online calculators show by default. The Fei Xing school (the transformation-based school) often keeps only the major stars and works by flying transformations, reading cause and effect between palaces. Both lineages have their merits, and neither is the right or the wrong way.

The schools also differ on leap months, the early-versus-late midnight hour, the transformation tables and star brightness, which is why professional tools make these configurable. Guanyitang's calculator shows the San He full-star chart by default and states its conventions openly on the chart, so you know which standard a given chart follows.

How Zi Wei Dou Shu differs from BaZi

Both read a life, but fix their gaze differently. BaZi reads the qi: it treats a destiny as a body of Five-Element energy, weighing generation and control, the Day Master's strength, and the tempo of the luck cycles — it traces trend. Zi Wei reads the image: it treats a destiny as twelve concrete scenes, the Spouse Palace speaking of marriage, the Wealth Palace of money — it judges the picture. Hence the folk saying that BaZi shows the arc of the cycles more clearly, while Zi Wei renders concrete affairs more finely. The two are not in conflict; skilled practice reads both — BaZi to fix the pattern's strength and favorable elements, Zi Wei to see the concrete affairs of a domain. The systems also share the groundwork of Yin-Yang, the Five Elements and the stems and branches — NaYin Five Elements, for one, is used in both.

How to read a Zi Wei chart

A sound order for beginners: the Life Palace first, reading the major-star combination for basic temperament and the scale of the chart; then the Body Palace and the three harmonies and opposition, hearing how a group of palaces answers itself; then the birth-year Si Hua, seeing where Lu, Quan, Ke and Ji fall to mark this life's emphases and lessons; finally the cycles, decade for the ten years, year for the year. The tool lays the chart out for you; a reading simply unfolds it layer by layer — there is no need to fret over every minor star at the outset.

Origins and texts

Zi Wei Dou Shu is attributed to the Song-dynasty Daoist Chen Tuan (Master Xiyi), but reliable sources reach back only to the Ming. The Zi Wei Dou Shu Quan Shu (ascribed to Chen Tuan, compiled by Pan Xiyin) is the root classic of the San He school, carrying the star-placement formulas and the star judgements; a parallel Shi Ba Fei Xing Ce Tian Zi Wei Dou Shu Quan Ji shares its source while differing in detail. The claim that Chen Tuan founded the art belongs to the tradition of pseudonymous attribution; the careful phrasing is "attributed to Chen Tuan, compiled in the Ming." In modern times the Zhongzhou lineage organized by Wang Tingzhi is the most widely transmitted, and Zi Wei has spread widely in Hong Kong and Taiwan to stand, with BaZi, as one of the two mainstream systems.

A note

The content of Zi Wei Dou Shu is for cultural study and self-reflection as entertainment; it makes no claim about fortune or misfortune, and does not replace medical, legal, financial or other professional judgement. Because schools and placement conventions differ, two tools may cast slightly different charts — this does not mean one is wrong, only that they follow different conventions; when reading, simply note whether a tool states its conventions.

Cast a Zi Wei chart at Guanyitang

Curious about your own Zi Wei chart? A free Zi Wei Dou Shu chart takes your birth time and returns it all at once — twelve palaces, fourteen major stars, birth-year transformations, and decade and annual cycles — with true solar time correction and switchable cycle layers. Casting is free; for a palace-by-palace in-depth AI reading, membership covers both BaZi and Zi Wei with a single plan.

FAQ

Which is more accurate, Zi Wei Dou Shu or BaZi?

They look through different lenses, so neither is simply more accurate. A common shorthand: BaZi reads the qi, Zi Wei reads the image. BaZi traces the Five-Element balance and the arc of the luck cycles more clearly; Zi Wei gives family, career and marriage each its own palace and renders concrete affairs more finely. Many people read both — agreement raises confidence, and disagreement is itself information. Either way, this is cultural and entertainment reference.

How do you read a Zi Wei chart?

Start with the Life Palace: the major stars there set a person's basic temperament and the scale of the chart. Then read the Body Palace and the three harmonies and opposition (a palace plus its opposite and its two trine palaces) — a reading never rests on one lone star in one palace, but on a group of palaces answering each other. Next read the birth-year Four Transformations, the four brushes that mark this life's gains and its lessons. Finally lay the decade and annual cycles on top to see the rise and fall of each stage.

Do I really need my birth hour for Zi Wei Dou Shu?

Yes. The Life Palace is fixed by both the birth month and the hour; the wrong hour shifts the whole chart and every judgement drifts with it. If you know only the rough period, cast with the nearest hour and check it against major life events; if you are entirely unsure, confirm with family or a birth record before casting.

Where can I cast a free Zi Wei Dou Shu chart?

Guanyitang offers a free Zi Wei Dou Shu calculator: enter your birth date and hour for a full twelve-palace chart — fourteen major stars, the support, malefic and minor stars, birth-year transformations, and decade and annual cycles in one view, with switchable cycle layers. Cross-timezone births can enable true solar time correction. Casting is free; the in-depth AI reading is part of membership.

References

• Attr. Chen Tuan (Ming dynasty), Zi Wei Dou Shu Quan Shu, comp. Pan Xiyin (root classic of the San He school, with the star-placement formulas)
• Shi Ba Fei Xing Ce Tian Zi Wei Dou Shu Quan Ji (Ming dynasty), an early system parallel to the Quan Shu
• Wang Tingzhi, Advanced Lectures on Zhongzhou-School Zi Wei Dou Shu (leading modern account of the Zhongzhou lineage)
• Guanyitang Zi Wei chart engine · twelve-palace star placement and Si Hua reference data