The sunstone crystal has been one of the most widely debated topics by historians about the drama Vikings. Long before History Channel released the series, historians had been debating whether Vikings used a common calcite crystal, also known as an Icelandic spar, to find the sun in the high latitudes where they would have had to navigate despite long twilights and cloudy, overcast skies. “The Vikings could have discovered this, simply by choosing a transparent crystal and looking through it through a small hole in a screen,” wrote Guy Ropars. “The understanding of the complete mechanism and the knowledge of the polarization of light is not necessary.”
Ragnar uses a „sunstone“ for ship navigation in the show, a piece of seemingly magical rock that will light up with the sun’s rays even on a cloudy day (the „sunstone“ allows for the use of his sundial-compass even on long voyages…
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Die Goldene Landschaft 