A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Ed Popko
Date: 2019 Jun 10, 06:16 -0700
I have been looking at Time Sight examples in this textbook and was not able, at first, to get the same results with my calculator programs. What was throwing me off was how Greenwich Time was stated. Some cases have Greenwich noon as 12, others at 00 (Civil vs Nautical).
My question is When did Greenwich Time adopt the Civil Time standard (noon at 12:00)?
Greenwich and Local Time conventions must be consistent to compute longitude by Time Sight.
Nautical Astronomy, Latitude, Longitude and Azimuth, Sumner's Method,
Marcq St. Hilaire's Method, Ocean Meteorology, International Rules and Signals
by International Textbook Company, 1902, 1908