A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Frank Reed
Date: 2018 Nov 23, 10:04 -0800
Mike Freeman, nine days ago you wrote:
"Would appreciate it if you could advise if it appears that I have understood correctly...
Select date & hour
Increments and corrections" [etc.]
I am guessing that no one got back to you on this (at least not in a public message) because you described the process correctly, and there just isn't much more to say about it. All that I would add is that the procedures here are specific to the Nautical Almanac. These steps are not properties of GHA and Declination but rather they are properties of the way that those quantities are tabulated in the Nautical Almanac. In the twenty-first century we have many more options for astronomical data. We don't have to turn to the Nautical Almanac as the "only game in town". Of course, you would want to learn its procedures for general familiarity and possibly for licensing exams (most of which act as if time stopped in the year 1980), but bear in mind that these steps with v and d and all that are not absolutes of navigation.
Clockwork Mapping / ReedNavigation.com
Conanicut Island USA