alt Hacker NewsThe sensor was sensitive enough that it could detect stars during daylight:
* https://theaviationgeekclub.com/the-sr-71-blackbird-astro-na...
* https://www.twz.com/17207/sr-71s-r2-d2-could-be-the-key-to-w...
* https://en.wikipedia.org/wiki/Missile_guidance#Astro-inertia...
That's insanely cool what kind of cameras / telescope are strong enough to do that? My guess is it was primarily hardware and not software bacuse of compute limits
Did the planes have to fly above clouds?