High Quality Content by WIKIPEDIA articles! Earth orbit rendezvous (EOR) is a type of space rendezvous and a spaceflight methodology most notable for enabling round trip human missions to the moon. While considered and ultimately rejected by NASA for the Apollo moon landing missions in favor of its cousin Lunar orbit rendezvous (LOR), Earth orbit rendezvous was an integral component of Project Constellation`s planned human spaceflight missions to the Moon beginning around 2020 before that program’s cancellation in October 2010.