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    Re: Azimuth diagram of Hanno Ix
    From: Jim Williams
    Date: 2020 Sep 27, 21:36 -0700

    [references this message]

    I think the azimuth will be northerly if SIN(Altitude)*SIN(Latitude) < SIN(Declination). Southerly if SIN(Altitude)*SIN(Latitude) > SIN(Declination).

    I think you can be a little clever and use Hanno's original chart to determine this.

    1. Mark the complement of the Altitude on the left side and draw horizontal line. (Complement being 90 minus Altitude.)
    2. Mark the Latitude on the top and draw vertical line.
    3. Find the intersection and following the curve up and to the right.
    4. Take the complement of the angle on the right next to the end of the curve.
    5. If Declination is greater than this angle, then azimuth is northerly, otherwise southerly. (Opposite for southern hemisphere.)

       
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