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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
precision.

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:
>
>
>
>

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