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    Re: Portuguese shipwreck question
    From: George Huxtable
    Date: 2009 Nov 3, 17:03 -0000

    Apache Runner wrote, in reply to Frank's suggestion about a projection on
    which to put his mediaeval data-
    
    
    | Uh...because I was teaching Mercator projections last week?  Because
    George
    | said so?  Both?
    
    =======================
    
    My own views shouldn't be taken too seriously on this matter. It's just that
    Mercator is the first projection that comes to my mind in terms of sea
    navigation, because it preserves the direction of bearings.
    
    But the mediaeval gazetteer that's under discussion here appears to be more
    related to travel by land than by sea, and it may well be that a simpler
    alternative, or one which preserves travel-distance better than Mercator
    does, may be more useful. Frank knows more about such matters than I do, and
    his suggestion of a conical projection should be taken seriously.
    
    The OMC website that I referred to allows for the following choices for
    projection-
    Mercator, Equidistant cylindrical, Polar stereographic, Lambert azimuthal,
    Azimuthal equidistant, Orthographic.
    But don't ask me to explain the differences between them.
    
    As for Thule, there seems little doubt that mediaeval navigators, Celts and
    Vikings, got that far, and that it was indeed what we now call Iceland. But
    that doesn't imply that every early voyager who claimed to have reached
    Thule really had. Those given coordinates for Is. Tule were a long way out,
    but then so they were for many other places on the Marseilles list.
    
    George.
    
    contact George Huxtable, at  george{at}hux.me.uk
    or at +44 1865 820222 (from UK, 01865 820222)
    or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    
    
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