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    Sun Altitude/Azimuth by 2102-D
    From: Greg Rudzinski
    Date: 2010 Oct 10, 16:57 -0700

    Try this alternate method of plotting the Sun on a 2102-D base disc.

    1. Set the 2102-D latitude template to the GHA of Aries for sunrise.

    2. Use Bowditch table #27 (amplitudes) to determine Sun azimuth.

    3. Plot Sun on 2101-D at the azimuth and zero altitude intersection as seen on the latitude template.

    Linked image shows sunrise example for 0602 UT 11 October 2010 at 35° N latitude.

    The Sun's altitude and azimuth can now be determined throughout the day by setting the latitude template to the LHA of Aries for the time of observation.

    Greg Rudzinski
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