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I was under the impression that Nessus was below the equator, and that one had to travel north to reach the hot jungles at "the waist of the Urth". Urth's magnetic fields may have flipped several times, but I don't think that civilization would globally agree to swap the designations "north" and "south" at those times
Two words for you, mort: "plate tectonics" <g>. Remember Gondwanaland (not literally, of course)? Continents migrate.
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