Developer Guides
Everything you need to know about integrating cosmic data into your projects, from basic setup to advanced geometric calculations.
Calculate Bazi Four Pillars with Python: A Complete Guide
Learn how to calculate the Four Pillars of Destiny (八字) from a birth date using Python. This guide covers the lunar calendar, Heavenly Stems, Earthly Branches, and practical code examples.
The Bazi Synastry Scoring Algorithm: A Technical Deep Dive
Understand the proprietary logic behind our professional Bazi Compatibility Synastry Engine, including weights, classical sources, and specific examples.
True Solar Time Calculator for BaZi
Why clock time is not enough for accurate BaZi. Learn how to calculate True Solar Time using Longitude and the Equation of Time (EoT).
Understanding Astrological Aspects for Developers
A deep dive into the geometry of astrology. Learn how to parse, interpret, and visualize the aspects returned by FreeAstroAPI.
How to Build a Natal Chart in 5 Minutes with React
A comprehensive guide to integrating FreeAstroAPI into your React application to generate professional natal charts.
Time Zones, LMT, and Precision in Astrology
Why a 4-minute error changes your Ascendant, and how our API handles historical shifts automatically.