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Articles in National Geographic News

Vikings Navigated With Translucent Crystals?

11 November 2011 – 20:09 |

In some Icelandic sagas—embellished stories of Viking life—sailors relied on so-called sunstones to locate the sun’s position and steer their ships on cloudy days.
The stone would’ve worked by detecting a property of sunlight called polarization.
Polarization …