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 eight minutes after the Agena had been launched, it had suffered a loss of chamber pressure. The Mission and Flight Directors therefore decided not to risk the main engine. This would be the only mission objective that was not achieved. Instead, the Agena's secondary propulsion system was used to allow the spacecraft to rendezvous with a total eclipse over South America on November 12, which Lovell and Aldrin photographed through the spacecraft windows. Aldrin performed three EVAs. The first was a standup EVA on November 12, in which the spacecraft door was opened and he stood up, but did not