Zi Wei Dou Shu (紫微斗數)
Purple Star map of destiny
Overview
Zi Wei Dou Shu, the Purple Star Astrology, is one of the two great pillars of Chinese fate calculation alongside BaZi. From a birth date, time, and the lunar calendar it constructs a chart of twelve palaces — Life, Wealth, Career, Marriage, Travel and more — and populates them with fourteen major stars and roughly forty auxiliary and minor stars. A governing bureau fixes the elemental phase and the starting age of the decade luck cycles. The Four Transformations then mark which stars are amplified into power, status, obstruction, or fortune. The result is a layered portrait far more granular than a single chart can show, read palace by palace.
Origin & history
Zi Wei Dou Shu is traditionally attributed to Chen Tuan (陳摶, c. 871–989), the legendary Daoist recluse of Mount Hua honored as Xiyi Xiansheng under Emperor Taizong of the Northern Song. The system is named for the Purple Star (Zi Wei), the pole star that classical Chinese cosmology placed at the still center of heaven, around which all other stars revolve as ministers around an emperor.
Circulating quietly through the Song, Yuan, and Ming dynasties as an esoteric Daoist art, the method was first set down comprehensively in the Ming-era classic Zi Wei Dou Shu Quan Shu, conventionally linked to the Ming scholar Luo Hongxian (羅洪先, 1504–1564). Largely a closed lineage transmission for centuries, it surged in popularity across Taiwan, Hong Kong, and Southeast Asia in the twentieth century, where competing schools such as San He and Si Hua refined its interpretation.
How it works
The engine converts the solar birth moment into the Chinese lunar date, then seats the Life Palace and Body Palace among the twelve palaces along the earthly branches. The Purple Star is anchored by a formula combining the bureau number and lunar day, after which the remaining thirteen major stars and the auxiliary stars fall into fixed relative positions; the Four Transformations are assigned from the birth year’s heavenly stem, and decade and annual luck cycles are layered on. The askTIAN API returns the full twelve-palace chart with every star placement, the bureau and element, the Four Transformations, and the decade luck sequence.
Good for
- Mapping life themes across career, wealth, marriage, and health palaces
- Reading decade luck cycles to time major life decisions
- Understanding innate temperament and hidden talents
- Assessing relationship and family dynamics through palace interactions
- Tracing how the Four Transformations energize or obstruct each domain
- Cross-checking a BaZi reading with a second classical lens
Use cases
Career direction
Examine the Career and Life palaces and their stars to identify suitable professional paths and timing for advancement.
Wealth strategy
Read the Wealth Palace and its transformations to understand earning style, financial risk tolerance, and prosperous periods.
Relationship insight
Analyze the Spouse Palace and its star pairings to surface compatibility patterns and marital timing.
Decade planning
Use the ten-year luck cycles to anticipate shifts in fortune and align ventures with favorable windows.
Key terms
- Zi Wei (紫微)
- The Purple Star, the emperor star of the system; its palace placement sets the tone for the entire chart.
- Twelve Palaces (十二宮)
- The twelve life domains — including Life, Wealth, Career, and Marriage — across which the stars are distributed.
- Four Transformations (四化)
- The transformations of Power, Status, Obstruction, and Fortune assigned by birth-year stem to four specific stars.
- Bureau (五行局)
- The governing elemental phase (e.g. Water-2, Metal-4, Fire-6) that fixes star anchoring and the start of decade luck.
API
The askTIAN Zi Wei Dou Shu API returns a complete twelve-palace Purple Star chart with all major and auxiliary star placements, the elemental bureau, the Four Transformations, decade luck cycles, and a 0–100 score.
Endpoint: POST /trpc/ziwei.chart — 20 TIAN Points. See the API documentation and Playground.