A developer released 'Watched Earth,' a browser-based tool that traces every satellite passing over any location in the past week using SGP4 propagation on ~17k CelesTrak objects, then retrieves real Sentinel-2, Landsat, and NASA imagery. The app renders all objects on the GPU, solving Kepler's equation each frame, and has been validated for accuracy even at edge cases like poles and the antimeridian.
Background
Satellite imagery tools have become increasingly accessible, with platforms like Sentinel Hub and Google Earth Engine providing public access to Earth observation data. This project makes tracking which satellites passed where locally and interactively.
- Source
- Hacker News (RSS)
- Published
- Nov 10, 2026 at 01:51 AM
- Score
- 5.0 / 10