Magical Viking stone may be real

A Viking legend which tells of a glowing "sunstone" that, when held up to the sky, disclosed the position of the Sun on a cloudy day may have some basis in truth, scientists believe.

The ancient race are believed to have to discovered North America hundreds of years before Christopher Columbus.

Now experiments have shown that a crystal, called an Iceland spar, could detect the sun with an accuracy within a degree – allowing the legendary seafarers to navigate thousands of miles on cloudy days and during short Nordic nights.

Dr Guy Ropars, of the University of Rennes, and colleagues said "a precision of a few degrees could be reached" even when the sun was below the horizon.

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