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This is Volume 1 of NASA's Apollo 11 Technical Crew Debriefing, dated July 31, 1969. The Mission Operations Branch of the Flight Crew Support Division at the Manned Spacecraft Center in Houston prepared it, and it was originally classified Confidential. In it Armstrong, Aldrin and Collins go phase by phase through suiting, launch, powered flight, Earth orbit and lunar surface activities. They comment on suit fit, vibration, checklists, lunar dust, footing and poor sleeping conditions in the lunar module. A section titled Visual Sightings appears in the table of contents.
“Low Earth orbit”2 pages
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## CONFIDENTIAL ## COLLINS (CONT'D) noticed to be a little bit low in the first SPS burn, climbed slowly and actually ended up slightly over 100. I put some specific comments on the voice tape. I thought it was a nominal burn. ## 7.5 ORBIT PARAMETERS. ## ARMSTRONG ONG In postburn NOUN 34, we had a 60.9-mile perigee and a 169.9-mile apogee. ## 7.6 BLOCK DATA UPDATES ## ALDRIN The LOS that we used, in addition to star checks, to tell if we were in the right position relative to the Moon and the Earth was like the horizon check and is an additional cross check. These calculations turned out to be within a second of the ground-predicted time. When the ground said we were going to lose signal at 75 41 23, it was a second later that signal strength dropped down. It was very comforting. ## ALDRIN ALDRIN We could see the horizon coming up a good bit before. I guess it was the one for TEI that was a little confusing as to which way we were pointed. ARMSTRONG You were the only one confused. ## CONFIDENTIAL
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