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