How Many People Work from Home?
18 by surprisetalk | 10 comments on Hacker News.
Monday, 9 November 2026
New top story on Hacker News: Show HN: Every satellite that passed over any place this week, and its photos
Show HN: Every satellite that passed over any place this week, and its photos
6 by a585gupt | 2 comments on Hacker News.
hey HN, i built this because i wanted to know what had actually photographed my street. 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://ift.tt/RzNv0A8 would love feedback, especially on what data sources to add
6 by a585gupt | 2 comments on Hacker News.
hey HN, i built this because i wanted to know what had actually photographed my street. 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://ift.tt/RzNv0A8 would love feedback, especially on what data sources to add
Sunday, 8 November 2026
Saturday, 7 November 2026
Subscribe to:
Posts (Atom)