What boggles the mind isn't that this was possible in the 60s, it's that it required such diverse and comprehensive achievements. It wasn't just a rocket. It's a very (!) long document but these stand out: (regarding the flight computers) The powered flight major loop contains guidance and navigation calculations, timekeeping, and all repetitive functions which do not occur on an interrupt basis. The minor loop conta…
Aliens and MIB went back in time to help them out on this, I am sure. Just ask agent K and Agent J. :-)