Viking Sunstones: How Ancient Mariners Navigated Without a CompassThe idea of Viking sailors crossing vast and often foggy seas without a magnetic compass may seem impossible. Yet historical accounts and scientific studies suggest they may have used special crystals known as sunstones to locate the sun—even when it was hidden. These tools may have played a role in the remarkable voyages of Norse explorers such as Leif Erikson, who reached North …
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