GPS satellites are just clocks that broadcast the time. That’s it. https://en.wikipedia.org/wiki/Global_Positioning_System#Basic_concept_of_GPS …
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Replying to @waldojaquith
it's absolutely bananas. Let's send 30 satellites that blare the time constantly into orbit and figure out everything from it
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Replying to @xor
I learned about this a couple of years ago, and I remain utterly agog at the simplicity of it.
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Replying to @waldojaquith
even just the unidirectional nature of it is very counterintuitive to lots of people!
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Replying to @xor
At least once a month, I think about this, and it makes me want to be a better technologist.
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Replying to @waldojaquith @xor
Having worked in this space, it's also shockingly fragile.
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About a third of the constellation was visible from Baghdad. A few satellites would drop, tracking went to utter shit.
6:08 PM - 22 Oct 2016
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