YHK - yet another hacker news clone

type in any place and it finds every satellite that passed over it in the last 7 days (SGP4 on the CelesTrak catalog, runs in your browser in about half a second), then pulls the real Sentinel-2 / Landsat / NASA images from those passes.

some fun bits: - the pass search can't skip a pass. checked it against a brute force on poles, the antimeridian and tiny swaths: 0 missed - all ~17k objects in orbit are drawn on the GPU, solving Kepler's equation every frame - Sentinel-2 timestamps are often 5-10 min off from when the sat actually crosses your spot, which was a fun one to figure out

it only says "watched" if a real image exists, and it doesn't store your location.

code: https://github.com/dev-Armaan/satellites

would love feedback, especially on what data sources to add