PracticeEco method library
Purple Star Astrology vs BaZi
A method-first comparison of two Chinese birth-chart systems without declaring a winner.
What the implementation can support
Purple Star Astrology and BaZi can begin with related calendar inputs, but they organise the output differently. PracticeEco’s Purple Star tool builds twelve named palaces, places fourteen major stars plus four required auxiliary stars, and attaches four transformations. A BaZi chart is organised around four pillars and their stems and branches. A label from one system should not be presented as if it were the same variable in the other.
The practical choice is about the structure a visitor wants to inspect. Purple Star foregrounds palace positions and star arrangements; BaZi foregrounds the pillar relationship. Both have lineage and calendar-rule differences, and neither output contains direct observations of a person’s behaviour. Comparing results by how “accurate” they feel invites selective memory and broad-statement matching.
Choose a calculator that publishes its calendar boundary, time handling, reference implementation, and uncertainty. PracticeEco currently implements the Purple Star path only. It does not convert a chart into a BaZi result, declare one method superior, or use either as a basis for consequential decisions.
Use and limits
This page explains a rule, label, or product boundary. It is not a clinical instrument, a forecast, or a substitute for direct evidence about a person. Different Purple Star astrology schools can use different calendar and transformation choices.
Sources and reproducibility
- Hong Kong Observatory: Gregorian–Lunar Calendar Conversion Table — The calendar-conversion layer used before the chart rules run.
- iztro: open-source Zi Wei Dou Shu implementation — A named, reproducible reference implementation for chart placement.
- iztro documentation: palace and star data structures — The distinction between palaces, major stars, and an opposite palace.
- Standards for Educational and Psychological Testing — The boundary between a reflection exercise and a validated interpretation or use.