# NavList:

## A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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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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