Yuanhai is a BaZi charting and classical-text interpretation service: a deterministic engine (true-solar-time correction, global timezones, four languages) + plain-language reports grounded in the classics + an anonymised case library, Qi Ren Hall.
Technical posture: zero LLM in charting, double-checked results; every report chapter carries its classical citations; Qi Ren Hall cases are numbered and anonymised with 3-tier hour-certainty labels.
Charting is never persisted; birth data attached to a purchased report can be deleted in one click from your account page — see the privacy policy.