| Maps drawn with Viking tradition on sunstones using a sort of gnomic projection (1. draft). |
Skalholt map, original dated. 1570, by Sigurdur Stefansson, Iceland. The original is lost and the present map is made by bishop Thordur Thorlaksson in 1670. The Royal library. Copenhagen.
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Viking geometry for Sunstone, Bearing-dial and Trelleborg Simulation of the geometry used with a canadian find
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