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    Re: Scale of Intercept
    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.

       
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