Ziwei Doushu (紫微斗数, Purple Star astrology) is a live depth module for natal palace–star charts.
What you get
- Deterministic natal chart construction (twelve palaces, major/auxiliary stars)
- Decadal / yearly stems and mutagen star names for a target date (placement structure, not palace luck verdicts)
- Documented upstream fork: iztro defaults (
fixLeap, time index 0–12) - Algorithm rules visible so verification is not gated
- Optional AI explanation (Pro / soft-free) that narrates engine facts + retrieved sources
Method notes
Read the Ziwei section on How we calculate before treating any palace layout as destiny. Birth time and sex are required in v1.
What we refuse
- Simulated “sample charts” that are not recomputable
- AI palace / pattern readings without a rule or passage trail
- Silent school switches
Status
Available now. Open app.daovian.com → Ziwei to build and inspect a chart. Same URL deepens — we will not invent a second path.