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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 it's adequate to go on with the truer altitude measuring device, which is from the ground. The ground measurements were very consistent. If they made a horizontal line, it would indicate that you were going to hit a particular perilune, in this case, 50 000 feet (in the middle of the chart). They didn't say that. They were very consistent, but they came down a slope, which said finally that our perilune was going to be 51 000 feet. It steadied out at about 54 000 feet here at the bottom and our last point was 51 000 feet. This indicated that either the ground was sloping; and, in fact, it was about 10 000 feet lower than the landing site where we started (which is not consistent with the A-1 measurement that we made), or that the line of apsides was shifted a little bit. So actually perilune was coming a little bit before PDI. So we were actually reaching perilune a little bit before PDI, which would tend to slope the curve that way. This was all very encouraging that we were, in fact, going to hit the guidance box so far as altitude was concerned from both measurements (the radar measurements and the ground measurements). But I was quite encouraged that ## CONFIDENTIAL
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