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    Re: Graphical method by Favet / de 'Lisle
    From: Gary LaPook
    Date: 2011 Apr 29, 09:20 -0700

    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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