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    Re: Sight reduction using a calculator's POL (arctan2) key
    From: Greg Rudzinski
    Date: 2018 Apr 3, 10:27 -0700

    Robert,

    The Canon calculators with the Pol(  key may do a better job than Casio or TI.  Once Pol( function is openned into screen then the complete formula with variables are entered. No need for ABC memories. Pressing = gives r value which is automatically stored in X and Zn is automatically stored in Y

    Looks like this when entered into the Canon calculator display for the example :  Lat 34° 10" N, Dec 5° 12' N, LHAt 48° 58'

    Pol( (Tan5°12°Cos34°10°) - (Sin34° 10°Cos48°58°) , - Sin48°58°    * see note

    = .80938    

    r = .80938  (automatically stored in X )   ;  Zn  (automatically stored in Y) = - 111.3°   Azimuth = 360° - 111.3° = 248.7°

    arc cos { r (cos dec) = Hc

    arc cos { .80938 (cos 5°12°)  = 36° 17.3' Hc

    * note- Casio and Canon for some reason displays ° ' "  entries as ° ° ° when using the ° ' " button.    This could lead to some confusion. 

    I take it that north lat and dec is positive and south is negative for formula entry to deal with same name and contrary name.

    Greg Rudzinski

       
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