Earth orbit rendezvous (EOR) is a potential methodology for conducting round trip human flights to the Moon, involving the use of space rendezvous to assemble, and possibly fuel, components of a translunar vehicle in low Earth orbit. It was considered and ultimately rejected in favor of lunar orbit rendezvous (LOR) for NASA's Apollo Program of the 1960s and 1970s. Three decades later, it was planned to be used for Project Constellation, until that program’s cancellation in October 2010.
Read more about Earth Orbit Rendezvous: Gemini and Agena Target Vehicle, Apollo, Constellation
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