A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Herman Dekker
Date: 2021 Jan 6, 07:13 -0800
I changed only the UT to 00:00:00 (on 1 jan 2021) the calculated Sun GHA is 179°06,9' that's not the same as I get from other sorces.
On average (10 sources) it is 179°08,5' so what is, or do I wrong?
I tested this because by conincidence a few days ago I was on the webstite of Johannes Hornbach. TheNauticalAlmanac.com
He has a nice collection off Celestial tables etc. and a Forum that nobody seems to use.
His complete nautical Almanac for 2021 has as GHA value 179° 08,2' I attended him on this (also) wrong value.
He thought it is the PYEem program that generates the wrong value.
His only Sun Almanac give the most common 179°08,5' value. Generated with one other program.
So Sean can you check your GHA value, or inform me how to use the program.