Using a Viking Sun Compass
Fragments of a wooden disc found in Uunartoq, Greenland, in 1948 have been identified as an eleventh century navigational instrument known as a sun compass or shadow board. Although reconstructions and theories on the exact methods of use vary, the basic principle is that by matching the shadow cast by the central gnomon against marks on the wheel's surface you can determine the direction of true north.
A 2014 paper published by the Royal Society offers a detailed analysis of the Uunartoq fragment together with an overview of existing theories on it's usage and a new theory about it's possible use at twilight.
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