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    Apollo Celestial Navigation System
    From: Paul Dolkas
    Date: 2012 Aug 25, 15:23 -0700

    In memory of Niel Armstrong's passing today, I went back and found a bunch of stuff on the Apollo navigation system. Most of what I found concerns the inertial navigation part of it - accelerometers & gyros, stuff like that. But there was also a rather sophisticated sextant system that they could use to navigate all the way back home in the event communications were lost and they couldn't make use of the tracking system on earth. As such, it was never used (not even during Apollo 13), except once as a test on the first cis-lunar flight, Apollo 8.

    I'll go back and try and dig up more, but here are notes from a training course, circa 1963.

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