FRfredrickd·Mar 25, 2024
yep that's right. uses https://github.com/shashwatak/satellite-js.
In Real-time map of every Starlink satellite in orbitshashwatak
satellite-js
TypeScript2015–2024
shashwatak / satellite-js
satellite-js
Modular set of functions for SGP4 and SDP4 propagation of TLE and OMM.
6Distinct people
7Mentions
0Explicit recommenders
1.1KGitHub stars
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What it is
Modular set of functions for SGP4 and SDP4 propagation of TLE and OMM.
GitHub
Where it is used
No documented product use has been verified yet.
What people are saying
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This week on Hacker News
Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 5:04:57 PM UTC.
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HN mentions by year7 dated mentions
Observed mentions: 2015-07-06 22:47:51 UTC to 2024-03-25 07:47:01 UTC.
Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.
View mention counts and date ranges
| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
|---|---|---|---|---|---|
| 2015 | 2015-01-01 00:00:00 UTC | 2016-01-01 00:00:00 UTC | 1 | 0 | 1 |
| 2016 | 2016-01-01 00:00:00 UTC | 2017-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2017 | 2017-01-01 00:00:00 UTC | 2018-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2018 | 2018-01-01 00:00:00 UTC | 2019-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2019 | 2019-01-01 00:00:00 UTC | 2020-01-01 00:00:00 UTC | 1 | 0 | 1 |
| 2020 | 2020-01-01 00:00:00 UTC | 2021-01-01 00:00:00 UTC | 1 | 0 | 1 |
| 2021 | 2021-01-01 00:00:00 UTC | 2022-01-01 00:00:00 UTC | 1 | 0 | 1 |
| 2022 | 2022-01-01 00:00:00 UTC | 2023-01-01 00:00:00 UTC | 1 | 0 | 1 |
| 2023 | 2023-01-01 00:00:00 UTC | 2024-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2024 | 2024-01-01 00:00:00 UTC | 2025-01-01 00:00:00 UTC | 2 | 0 | 2 |
What Hacker News says
7 sourcesLooks like related events. An orange fireball at 19:00 in NE Bangkok and then a green fireball in SE Bangkok at 21:00. Fireball reporting's a cool one I had not seen before.
I'll add https://www.keeptrack.space/app/ to the list of suggestions. Although it may be more intimidating than helpful.
Neat site though, has 3D globe height tracking and in the upper right you can filter with the layer menu for "rocket bodies" and "debris". Very few sites I've found that can filter for debris objects. Be careful if your GPU is low-end though, it can be a resource hog.
Also, satellite.js and https://github.com/shashwatak/satellite-js/wiki/Sites-using-... which is where I found KeepTrack
In Reentry of International Space Station Batteries into Earth's AtmosphereIt's using Three.js[^1] with Photons[^2], and a number of other interesting libraries for calculation like satellite-js[^3].
[1]: https://github.com/mrdoob/three.js/
[2]: https://github.com/mkkellogg/Photons
[3]: https://github.com/shashwatak/satellite-js
In Low Earth Orbit VisualizationWhile we're listing libraries, I was super impressed with satellite.js for the same reasons https://github.com/shashwatak/satellite-js
I used it to make https://droid.cafe/starlink
In Low Earth Orbit VisualizationExactly this.
I grabbed a set of TLEs from celestrak (which I'm serving from my site), and then I propagate them forward with satellite-js [1] to the current date 6 times a second.
[1] https://github.com/shashwatak/satellite-js
In SpaceX applies to offer high-speed internet service to CanadiansMost of the data is typically in a two-line element format [0]. You can grab it here https://www.space-track.org or here https://celestrak.com/NORAD/elements/
(although I believe the celestrak data comes from space-track, correct me if I'm wrong)
The satellite positions are then estimated using an algorithm such as sgp4 implemented in quite a few languages:
* https://github.com/joshuaferrara/go-satellite (<-- disclaimer: this is mine)
* https://github.com/brandon-rhodes/python-sgp4
* https://github.com/shashwatak/satellite-js
Check out Dr. Kelso's (he works for AGI now) original work here in Pascal, plus a few links to C++ works: https://celestrak.com/software/tskelso-sw.php
[0] https://celestrak.com/columns/v04n03/
In Spacebook: AGI's near Real-Time satellite viewerAwesome :) I've added the github repo to my comment!
And yes, we were using satellite.js [1] which provided us with the propagation functionality together with a static set of TLEs from space-track [2] - I'll add an github issue for adding support for dynamic aggregation of that data right away actually :)
[1] https://github.com/shashwatak/satellite-js
[2] https://www.space-track.org
In Stuff in Space