Repost of https://twitter.com/kenshirriff/status/1628118949421363201?t=xK-n3fJAvTJwzgaa-yIgVQ&s=19
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Ken Shirriff (@kenshirriff) on X
How did Russian cosmonauts know where they were? The Globus INK (1967) showed the position of their Soyuz spacecraft on a rotating globe. It is an analog computer built from tiny gears. I reverse-engineered the wiring (which inconveniently had been cut) and we powered it up. 🧵