Zi Wei Dou Shu

Zi Wei Dou Shu — often translated as Purple Star Astrology — is a traditional Chinese natal-chart system that arranges symbolic stars across twelve palaces, each palace standing for an area of life such as career, family, wealth, health, or relationships.[1] Its stars are calculated positions derived from the birth data rather than observed astronomical bodies.[2]

The system belongs to the broader family of Chinese calendrical divination that developed alongside the lunisolar calendar and was widely practised in traditional society.[3] Its best-known compiled text, the Zi Wei Dou Shu Quan Shu, is traditionally attributed to the Song-era figure Chen Tuan, an attribution that is traditional rather than independently documented.[4]

Where BaZi weighs elemental balance across four pillars, Zi Wei Dou Shu spreads meaning across a twelve-part map, which makes it useful for thinking about many life areas at once.

This is a calculated chapter, and it is the most time-sensitive one in your mosaic: the chart depends on the two-hour period of birth. Birth Mosaic will not generate a palace map without a reliable birth time, and it keeps this chapter separate from BaZi and the Chinese zodiac.

• How twelve life areas can be considered side by side
• Which palaces traditional practice reads as most emphasised
• What the major stars are said to contribute to a palace
• How the Four Transformations shift a reading
• Why this system is distinct from BaZi and the birth-year zodiac

Palace

One of twelve chart houses, each tied to a life area such as wealth, travel, or parents.

Zi Wei

The 'purple star' placed first in the chart; its position organises the other stars.

Major stars

A core set of named symbolic stars distributed by calculation across the palaces.

Four Transformations

Four modifiers tied to the birth year's heavenly stem that change how a star is read.

Lunisolar conversion

Translating a Gregorian birth date into the Chinese calendar date the chart requires.

Example: if a chart placed Zi Wei in the Career palace, a traditional reading might discuss themes of responsibility and visibility in work, then check the surrounding palaces before drawing conclusions. This is an educational illustration, not your chart.

This is a historical Chinese tradition with multiple lineages. Palace names, star lists, and reading methods vary between schools and translations, and much English-language material is modern practitioner interpretation rather than historical record.

These are three distinct systems. Zi Wei Dou Shu is not another name for BaZi, and Birth Mosaic keeps them as separate Discovery Chapters.