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Show HN: Every satellite that passed over any place this week, and its photos

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

    would love feedback, especially on what data sources to add



    • Comments URL: https://news.ycombinator.com/item?id=50428907


    Points: 9


    # Comments: 2

    7:05 pm, November 9, 2026

    guid

    https://news.ycombinator.com/item?id=50428907

    source_url

    https://www.watched.earth/

    author_name

    a585gupt

    id: 8457
    uid: EXV4p
    insdate: 2026-11-09 19:05:32
    title: Show HN: Every satellite that passed over any place this week, and its photos
    additional:

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

    would love feedback, especially on what data sources to add



    • Comments URL: https://news.ycombinator.com/item?id=50428907


    Points: 9


    # Comments: 2


    category: Hacker News
    md5:
    guid: https://news.ycombinator.com/item?id=50428907
    source_url: https://www.watched.earth/
    updated:
    image:
    author_name: a585gupt
    author_link:
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