Two Lenses on One Chart
Your birth data can be read through two distinct classical Chinese frameworks. Here they are, side by side. Neither replaces the other. Both describe the same person, from different angles.
Bazi (Four Pillars) uses the solar calendar. The year changes at Li Chun (立春, Start of Spring), around February 4. If you were born before Li Chun, Bazi places you in the previous solar year for the Year Pillar, regardless of when Chinese New Year fell. We cover Li Chun and the zodiac year boundary in more detail if this distinction is new to you.
Zi Wei Dou Shu uses the lunar calendar. The year changes at Chinese New Year (正月初一), which falls between late January and late February each year. The year stem used to compute the Four Transformations (四化) is the Chinese lunar year of your birth date.
For most people these agree. If your birthday falls in January or early February, the two systems may assign different year stems. This is a documented difference in how each tradition defines the year, not a calculation error in either system. This page computes each system independently using its own correct boundary.
Both columns are generated from rule-based classical interpretations, not a practitioner's consultation. The Bazi text draws on Day Master archetypes, Ten God positions, and element associations. The Zi Wei text draws on the major stars placed in each palace at birth. These are starting points for reflection, not authoritative verdicts. Where they converge, that agreement is worth sitting with. Where they diverge, the difference is itself useful, showing that a single framework captures only part of what a person is.
If you would like to go deeper into either instrument, our guide to Zi Wei Dou Shu explains the twelve palaces and how the purple star system reads a chart, and for two people rather than one, the Bazi compatibility guide looks at how two charts are traditionally read together. Both are offered for reflection.
How Does the Bazi and Zi Wei Comparison Work?
Both columns start from the same three inputs: birth date, birth time, and birth place. From there the two systems diverge. The Bazi reading converts your birth moment into four pillars, each holding a Heavenly Stem and an Earthly Branch, then identifies the Day Master and reads the Ten God relationships surrounding it. The Zi Wei reading takes the same moment, converts it to a lunar date and one of the twelve double hours, then places fourteen major stars and their supporting stars across twelve palaces, each palace governing a domain such as career, wealth, or relationships. The page reports what each system says about five life areas, side by side. The most visible technical difference is the year boundary. Bazi follows the solar year and changes at Li Chun, around February 4, while Zi Wei follows the lunar year and changes at Chinese New Year. The exact solar term dates both systems depend on are published by the Hong Kong Observatory.
How Should You Use This Result?
Treat both columns as material for reflection rather than competing verdicts. Where the two systems agree, that convergence is worth sitting with, because two different classical methods have arrived at a similar description. Where they disagree, the difference is equally useful: it shows that any single framework captures only part of a person. Neither column predicts events. The year boundary deserves care in practice. Zi Ping Bazi uses Li Chun, the solar term that begins spring around February 4, as the start of the year, not Chinese New Year. If you were born in January or early February, the two columns may assign different year stems, and that is a documented difference between the traditions rather than an error in either. Everything here is offered as cultural interest. It is not fate, medical, financial, or professional advice.
What Is the Cultural Background?
Bazi and Zi Wei Dou Shu developed as separate instruments within a shared cosmological vocabulary. Bazi in its Zi Ping form was consolidated during the Song dynasty from earlier stem and branch methods. Zi Wei Dou Shu, attributed by tradition to Chen Xiyi, organises a chart spatially around twelve palaces rather than as a sequence of pillars. Both rest on the same assumptions about correlation between time, pattern, and character that run through classical Chinese thought, discussed in the Stanford Encyclopedia of Philosophy entry on Chinese metaphysics.