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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.
## CONFIDENTIAL angular rate track of objects observed on the ground. We superimposed the two of them on one graph and rear- ranged the graph a little bit with some rather last-minute data shuffling to give us something that the two of us could work on at the same time and to give indication of what the altitude and its time history appeared to be. With the communications difficulties that we were expe riencing in trying to verify that we had a good lockon at this point, I had the opportunity to get only about two or three range-rate marks. They appeared to give us a perilune altitude of very close to 50 000 feet, as far as I could interpolate them on the chart. Those measurements give you altitude below the command module, essentially. And, of course, there are some modifications of the command module orbit, from the nominal preflight orbit that you expect. The numbers either have to be updated or you have to accept the error. ## ARMSTRONG The measurements against the ground course were indicative of altitude directly above the ground. ## ALDRIN The main purpose of the radar here was to confirm that we were in the same ballpark, the same kind of an orbit. And I think once you accomplish this several times, then ## CONFIDENTIAL
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