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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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    Re: Apollo Sextant
    From: Paul Dolkas
    Date: 2019 Jul 19, 04:42 +0000

    There were two different sextants, one on the Command Module and a different one on the Lunar Module. In general they were used to reorient the gyroscopes in the Inertial Measurement Unit, since the alignment would drift over time. Nowadays they use automated star trackers. They also had the ability to completely reset the IMU by themselves in case it failed, but they only did that once during the flight of Apollo 8, when Jim Lowell accidentally zeroed it out.

    I have a much more detailed explanation of how each of them worked, and con post them if folks are interested.

    Paul Dolkas

     

    From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Zane Grey
    Sent: Tuesday, July 16, 2019 6:02 PM
    To: Paul Dolkas
    Subject: [NavList] Apollo Sextant

     

    Haha! Just found out that the Apollo program used space sextants! Wrecking my brain trying to imagine how they worked! Did they have to look at starts on the far side of earth to them??? 

    http://www.astronomy.com/news/2018/06/the-story-of-the-apollo-sextant

       
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