Web tools

術數 tools

Almanac summaries, I Ching lookup, and Huangji Jingshi — full features in the apps

Almanac tools

Quick yi/ji and calendar lookup. Full tongsheng, hours, and offline use: Tongsheng Calendar app.

Tongsheng Calendar product

Today’s yi/ji

Daily almanac summary

Solar–lunar convert

Bidirectional date conversion

Public holidays

Six regions at a glance

Almanac glossary

Clear term definitions

I Ching tools

Hexagram glossary, casting overview, and Huangji Jingshi explainer. Full charts and AI chat: Plum Oracle app.

I Ching tools hub · Plum Oracle product

Hexagram glossary

Sixty-four hexagrams, concise

Casting overview

Flow and structure demo

Huangji Jingshi

Pick a year: Yun / Shi / decade / year; offline, no AI credits