A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: David C
Date: 2021 Jun 20, 21:13 -0700
Franks you have raised a subject that I find confusing. I calculated gha sun - gha aries for the time you specified. The answer was 90° (give or take a few tenths of minute of arc beeause I did not pay attention to interpolation). Is this the SHA sun - your figure was 270?.
Many of my navigation text books have lengthy chapters on time which I find confusing. The texts are mostly based on the RA and R, E almanacs rather than the GHA version used from the 1940s.
Can you please give an explanation of SHA sun and the solstice based on the GHA almanac.