Buzz Aldrin is the original legend. His PhD was literally "how to eyeball your way there in orbit,"[0] and then he actually performed the calculations and procedure he invented (with slide rule and sextant) when the automatic system failed on Gemini 12. He used less fuel than the computer.[1]

There's a reason why his nickname among the other astronauts is Doctor Rendezvous.

[0] https://dspace.mit.edu/handle/1721.1/12652

[1] https://history.howstuffworks.com/historical-figures/buzz-al...