23 Daily — The open-source Ziwei Dou Shu charting engine "ziwei-doushu" by Renhuai123 released its latest version v4.0 on October 15, 2026. This project is based on the Ni Haixia's "Tian Ji" system, comprising a complete charting algorithm, the Four Transformations system, a pattern knowledge base, and ancient text data, along with extensive interpretive datasets. Information according to the project's description.
Project Content and Technical Scale
This project offers an open-source charting system based on traditional Chinese astrology Ziwei Dou Shu, following the authentic system compiled by Professor Ni Haixia in "Tian Ji." The newly released 13-dimensional interpretation dataset v4.0 covers 674,976 charts from 1950 to 2026, each with 13 interpretive dimensions, totaling 8,774,688 interpretive segments, approximately 56.6 GB decompressed and about 20.4 billion Chinese characters. Compared with version 3.0, the dataset sees significant increases in chart count, text length, and coverage years.
Complete Charting Engine and Data Features
The charting engine is fully open source and includes real solar time correction (longitude difference and equation of time), China DST rules for 1986-1991, lunar-solar conversion, among other features, ensuring precise chart results. Updates also cover star brightness data, twelve deadly stars, and star brightness school comparisons. The knowledge base contains 1,848 original quotes from Ni Haixia's "Tian Ji · Zi Wei Dou Shu," with timestamped text for exact reference. The project uses MIT license for code and CC BY 4.0 for data, allowing free commercial use except quoted original sayings.
Online Experience and Scope Limitations
Users may try the charting and AI interpretation features at metisziwei.com. The project notes limitations in Ziwei Dou Shu for kinship (parents, siblings, children) analysis, marking relevant content as advisory. The system is designed to integrate traditional wisdom with modern technology, using deterministic generation to ensure consistent output per input.
Editor's take: Opportunities and Verification for Entrepreneurs
This open-source Ziwei Dou Shu engine shows how traditional knowledge can integrate with modern technologies. The vast publicly available dataset and algorithms provide a foundation for entrepreneurs to develop personalized astrology services or AI interpretation products. By downloading and comparing charts over different years, genders, and time periods, adding localized or sector-specific content, entrepreneurs can explore multiple applications. Further user testing and accuracy verification, particularly regarding kinship analysis, can guide service improvements and business model refinement.