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The video combines data from the onboard computer for altitude and pitch angle, 16mm film that was shot throughout the descent at 6 frames per second.  The audio recording is from two sources.  The air/ground transmissions are on the left stereo channel and the mission control flight director loop is on the right channel.  Subtitles are included to aid comprehension.  This is part of the Apollo Flight Journal, Apollo 11 collection.  Also available by David Woods:  'How Apollo Flew to the Moon'.  This book is available from all usual outlets including Google and Kindle as well as paperback.   Glossary:  FIDO (or FDO): Flight Dynamics Officer / Delta H: Height Difference / 1202: Computer Error Code / ACA: Attitude Control Assembly / RETRO: Retrofire Officer (responsible for getting the craft back).

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