Uses satellite.js 6.0.1 pure-JavaScript SGP4 published runtime, MIT, from shashwatak/satellite-js. Current repository research commit recorded separately; runtime intentionally pins 6.0.1 to avoid optional WASM in 7.x. Fixed synthetic historical orbital elements; not current ISS tracking.
Repository https://github.com/shashwatak/satellite-js
Commit 57fef13be7212549ea1a43d07778549845040a86
Complete editable adaptation: all local HTML/CSS/JS files. No build required.