A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: David C
Date: 2020 Feb 1, 13:19 -0800
Thanks for the quick and clear replies. I think that I understand it now (-;.
To summarise lat and long are an artificial construct imposed on a sphere. If I completely ignore lat and long and instead think of a sphere with great circles drawn on it it all makes sense. What a relief. I thought that I had found a major error in Marc St Hilaire's thinking!!!!
To change the subject slightly. I have an AP way out in the southern ocean. The intercept is 11°. Is it valid to draw a 660nm line on google-earth? At that scale I am geting the "sphere" projection of google-earth.