Khom Loi, Drawn · โคมลอย วาดด้วยคณิต

The Yi Peng sky lantern drawn with the physics of hot air: why it rises, one flight from lighting to landing, where the wind brings forty lanterns down over Chiang Mai, and how many are up at once. English and Thai.

Live: https://motdang.net/sites/khom-loi/ · https://nanobotco.github.io/khom-loi/

• docs/lantern.js — the lantern: ideal-gas lift, fuel burn, heat in and out, drag, wind growing with height.
• docs/app.js — every drawing on the page.
• tools/copy_text.py — every word, both languages; tools/build.py writes the pages (--motdang for the motdang.net copy).
• tools/mapdata.py — cuts water and the runway out of Mot Dang's map (OpenStreetMap contributors, ODbL).
• research/facts.md — the sourced notes behind the page.

Text CC BY 4.0, code MIT. Photographs keep their own licences, listed on the page.