A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Huub Robroek
Date: 2021 Apr 3, 12:52 -0700
Thanks for the feedback. You are right, I checked this again. It seems I did the wrong math to get to the average sun altitude (adding iso subtracting...).
My correct (calculated) sun's alt should be: 37 deg 21.8', which is still big (11.6' deviation), I think. See attached Frank's app results.
Still, I get a cleared LD of 79deg 16.9', compared to the app result for cleared LD of 79deg 17.2' (according Frank's app result).
This difference in LD of just 0.3', would correspond to about 8 sec in GMT, if I am not mistaken (and understand Frank's Guidebook correctly).
This looks too good to be true.