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    Re: Graphical method by Favet / de 'Lisle
    From: Greg Rudzinski
    Date: 2011 Apr 29, 08:55 -0700


    Perhaps the nomogram can work as an azimuth check but I find using the 2102-D as the best device for this since all your students should already have one. Plot the Sun, Moon, and planets onto the disc using SHA and declination information for the dates needed. The azimuth from the 2102-D is close enough to identify calculator blunders. I like the azimuth formula INV Sin [(COS DEC x SIN LHA)/ COS altitude Hc ]. When LHA is greater than 90 and less than 270 then apply the calculator result off the elevated pole. Pub 249 will also provide a quick azimuth good enough to plot or check a calculator. Just enter with the nearest LHA, Latitude, and Declination. Using the calculator to solve Hc allows the DR to be used as the assumed position so the approximate azimuth from the 2102-D or Pub 249 will be good enough for the plot.

    Greg Rudzinski
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