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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@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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