Show HN: Every satellite that passed over any place this week, and its photos
A weekend project that lets you enter any location and find every satellite that passed over it in the last 7 days (SGP4 on the CelesTrak catalog, 17k+ objects, ~0.5s in-browser), then pulls real Sentinel-2, Landsat and NASA imagery from those passes. All objects are drawn on the GPU with Kepler's equation solved every frame, and the author handled the 5–10 minute offset between Sentinel-2 timestamps and actual overpasses. Code is open source on GitHub.
What this means for indie developers：A useful open-source reference for large-scale orbital computation, GPU rendering and geo-visualization in the browser.