Earth Orbit Rendezvous was a proposed method for American space missions to the Moon. It consisted of using a series of small rockets half the size of a Saturn V Rocket to put different components of a spacecraft to go to the Moon in orbit around the Earth, then assemble them in orbit. It was viewed as undesirable because at the time there was not that much experience with maneuvering space objects to rendezvous, and it was unknown if the ship could be successfully constructed in space.