Editing Lunar orbit rendezvous (section)

===Disadvantage===
Lunar-orbit rendezvous was considered risky in 1962, because [[space rendezvous]] had not been achieved, even in Earth orbit. If the LM could not reach the CSM, two astronauts would be stranded with no way to get back to Earth or survive [[atmospheric entry|re-entry into the atmosphere]]. Rendezvous was successfully demonstrated in 1965 and 1966 on six [[Project Gemini]] missions{{refn|group=Note|[[Gemini 6A]], [[Gemini 8]], [[Gemini 9A]], [[Gemini 10]], [[Gemini 11]], and [[Gemini 12]]}} with the aid of radar and on-board computers. It was also successfully done each of the eight times it was tried on Apollo missions.{{refn|group=Note|[[Apollo 9]] in Earth orbit; in lunar orbit on [[Apollo 10]], [[Apollo 11]], [[Apollo 12]], [[Apollo 14]], [[Apollo 15]], [[Apollo 16]], and [[Apollo 17]].}}