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    Rust's diagram for computing azimuth
    From: Gary LaPook
    Date: 2007 Oct 08, 11:42 -0700

    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.
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