Calculation-backed
Public date facts come from the approved calculation engine and signed solar-term dataset. Page copy explains the returned facts and does not change them.
Editorial policy
Useful answers without invented certainty.
Plain-language and bounded
Each guide separates a direct answer, traditional context, practical use and personalisation boundary. High-stakes claims and guaranteed outcomes are not marketed.
Corrections are traceable
Meaningful calculation or content corrections update the affected canonical page and sitemap metadata. Method and dataset versions remain visible for audit.