Buzz Aldrin on July 20, Aldrin and Armstrong entered "Eagle", and began the final preparations for lunar descent. At 17:44:00 "Eagle" separated from the "Columbia". Collins, alone aboard "Columbia", inspected "Eagle" as it pirouetted before him to ensure the craft was not damaged, and that the landing gear was correctly deployed. Throughout the descent, Aldrin called out navigation data to Armstrong, who was busy piloting the "Eagle". Five minutes into the descent burn, and above the surface of the Moon, the LM guidance computer (LGC) distracted the crew with the first of several unexpected alarms that indicated that it could not complete
Buzz Aldrin trailblazing mission; rendezvous from above had already been successfully performed by Gemini 9, and the tethered vehicle exercise by Gemini 11. Even gravity-gradient stabilization had been attempted by Gemini 11, albeit unsuccessfully. Gemini 12 was launched from Launch Complex 19 at 20:46 UTC on November 11, 1966. The Gemini Agena Target Vehicle was launched about an hour and a half before. The mission's first major objective was to rendezvous with this target vehicle. As the target and Gemini 12 capsule drew closer together, radar contact between the two deteriorated until it became unusable, forcing the crew to rendezvous manually. Aldrin