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    Re: Position from altitude and azimuth.
    From: Bill Lionheart
    Date: 2020 May 9, 08:47 +0100

    Did anyone try the spherical sine rule followed to find the LHA
    followed by Napier's analogies (see
    https://mathworld.wolfram.com/NapiersAnalogies.html)  to find the Lat
    ? My answer (assuming spherical earth)  39 ° 4.2'N, 76 ° 59.7' W but
    is numerically unstable and maybe I only got away with it using by
    Mathematica, a symbolic algebra program that can work to a high
    I notice the use of iterative methods above, and that seems like a
    good idea. Anyone got any references to read on iterative verses
    Napier?  I have a vague memory I read about this long ago.
    Bill Lionheart
    On Sat, 9 May 2020 at 05:17, Lars Bergman  wrote:
    > Dave Walden asked "Where am I?"
    > Enclosed my solution.
    > Lars
    > File:
    > View and reply to this message

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