A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: David Iwancio
Date: 2022 May 18, 21:00 -0700
Just as an aside, for adding predicted refraction to a pre-computed altitude, I ended up with:
cot[Hc + 8.72/(Hc+4.36)]
All I did was fit the curve to the NA refraction tables through two points: where Hc equals 0 and where the expression "A/(Hc+B)" equalled 1.