BBC NEWS | Europe | Crystals 'helped Viking sailors': "Crystals 'helped Viking sailors'
Sun
The sun was not necessary for Vikings to navigate, say researchers
Vikings may have used a special crystal called a sunstone to help navigate the seas even when the sun was obscured by fog or cloud, a study has suggested.
Researchers from Hungary ran a test with sunstones in the Arctic ocean, and found that the crystals can reveal the sun's position even in bad weather."
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