The angle around 110 dg tells us that it is made for a latitude around 62N

The find from Canada can be used with a gnomon in the middle measuring sunrise at summer solstice and it can be used measuring latitudes from around 45N to the polar circle, but it is most probable in common use as a calendar around the high north and the polar circle. The simulation for 65.5N at the left showes like the pattern on the stone that the sun are above the horizon night and day around summersolstice. Viking geometry has been used constructing this item..

Sunstone from Canada - link to the museum

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