Vikings may have relied on complex sundials among other tools to determine latitude, according to a study published in the journal Proceedings of the Royal Society A. The research looked at a Viking sundial discovered in Greenland that scientists believe may have been used to determine latitude, or north-south navigation. "It is widely accepted that Norse people were excellent mariners. Now it seems they used much more sophisticated navigational instruments than we thought before," said the study's co-author Balázs Bernáth.

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