You can... if you're Buzz Aldrin.

His PhD thesis was called "Line-of-sight guidance techniques for manned orbital rendezvous", and was famously dedicated:

In the hopes that this work may in some way contribute to their exploration of space this is dedicated to the crew members of this country’s present and future manned space programs. If only I could join them in their exciting endeavors!

Later he would use this very technique on Gemini 12. Aldrin had to manually perform the rendezvous calculations after the radar system failed.

The other astronauts nicknamed him Doctor Rendezvous.