The Definitive BaZi API
Generate the Four Pillars of Destiny directly from a precise time and location. Get the exact Stems, Branches, and hidden elements with mathematical astronomical rigor.
Astronomical BaZi Generation
BaZi requires exact solar terms to calculate the month pillar, and true solar time to calculate the hour pillar. Open Ephemeris handles these astronomical complexities automatically.
Local Coordinate Correction
Your coordinates are used to align the provided standard time to true local solar time relative to the prime meridian.
Solar Term Tracking
The Sun's position is verified against the 24 solar terms (Jieqi) to ensure the month pillar reflects the exact seasonal transition.
Stem & Branch Resolution
The precise 10 Heavenly Stems and 12 Earthly Branches are computed alongside their hidden elemental interactions.
{ "data": { "day_master": "Yi", "element": "Wood", "pillars": { "year": { "stem": "Jia", "branch": "Xu" },"month": { "stem": "Jia", "branch": "Xu", "hidden": ["Wu","Ding","Xin"] }, "day": { "stem": "Yi", "branch": "Mao" }, "hour": { "stem": "Gui", "branch": "Wei" } } } }
Month pillar transitions at exact Jieqi · true solar longitude computed from NASA JPL ephemerides
The Engine for Chinese Metaphysics
Four Pillars & Beyond
Calculate the exact Heavenly Stem and Earthly Branch for the Year, Month, Day, and Hour pillars.
True Solar Time
Traditional BaZi uses true solar time. We correct for longitude and the equation of time to ensure absolute precision for the Hour pillar.
Hidden Stems
Every Earthly Branch contains hidden stems (main, sub, and residual Qi). Our API calculates and returns these automatically.
JPL Solar Longitude
Month pillars shift at the exact moment the sun crosses 15° solar longitude intervals (Jieqi). We calculate this using NASA JPL ephemerides.
Calculate Destiny with Precision
The Explorer tier is free to start. Connect your app to the most accurate BaZi generation engine online.