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 leave the spacecraft. The standup EVA mimicked some of the actions he would do during his free-flight EVA, so he could compare the effort expended between the two. It set an EVA record of two hours and 20 minutes. The next day Aldrin performing his free-flight EVA. He climbed across the newly installed hand-holds to the Agena and installed the cable needed for the gravity-gradient stabilization experiment. Aldrin performed numerous tasks, including as installing electrical connectors and testing tools that would be needed for Project Apollo. A dozen two-minute rest periods prevented him from becoming fatigued. His second EVA concluded