NavList:

On Oct 8, 1:42 pm, Gary LaPook < glap...---net> wrote:
> Gary LaPook writes:
>
> Attached is Rust's diagram for computing the azimuth of the sight which
> was included in Weems "Line Of Position Book," 1927. It was developed
> using the sine formula. You enter on the left with LHA and go to the
> right to the declination then straight up to the altitude then to the
> right to the azimuth. Also included is a table used to determine in
> which quadrant the azimuth falls when the body is close to east or west.
> This diagram can be used with any set of tables, H.O. 208, H.O. 211,
> etc., and the extra steps used in those tables to compute the azimuth
> can be disregarded.
>
> The shape of these curves show the potential loss of accuracy using the
> sine formula as the azimuth approaches 90º as the altitude curves become
> almost vertical and only slight changes in altitude results in large
> azimuth changes.
> --
>
> Rust diagram.pdf
> 206KDownload
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