Hi: I know this thread is off-topic, but it's a great subject. If memory serve me right, the Command Module and Lunar Module both had optical sextants, inertial navigation units, and navigation/flight control computers. These were used together for navigation and executing engine/thruster firings. Trajectory information was obtained from both the crew's sextant observations and ground-based precision tracking data. I believe that most maneuvers were executed by the computer, but the crew could also do them manually by using their hand controllers and watching their flight instruments. When the Lunar Module lifted-off from the Moon, the computer probably did most of the work during the ascent burn (which wasn't that long...maybe a few minutes). When the LM's orbit brought it close to the CM, the Lunar Module stayed still and the Command Module Pilot would move in and perform the docking. There were numerous opportunities for the two vehicles to dock, so the chances of the returning moon walkers being stranded were not that great. The best information on how the Command and Service Module (including navigation) worked was the "Apollo Spacecraft Handbook" published by the Public Relations office at North American Aviation around 1968 (I used to have a copy of this superb book). There was probably a similar book published by Grumman for the Lunar Module. Regards, Brian Webb ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www2.satellite.eu.org/seesat/seesatindex.html
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