NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Guus Dekker
Date: 2013 May 16, 02:44 -0700
In March I read an article in a Dutch newspaper (NRC, March 7 2013) about "Sunstones". The article tells for the first time in history they find a
Sunstone on the plotting desk from a ship wreck from 1592.
A sunstone is a vintage navigation device 5x3 cm (1x2 inch), a crystal named "Iceland Calsietcrystal". They say that the Vikings did use it for centuries
ago (1000 - 1300 ac). This material makes it possible to SEE polarized light by refraction in the atmosphere, forming circles around the sun. This crystal
doubled the rings. If the rings are equally strong in intensity, then it point stait to the sun, EVEN when the sun is blocked by heavy clouds or just set.
Polarized light has s one direction vibration frequency like a polarized sunglass, so only a single frequency is passed.
Researchers describe the Sunstone in "The Proceeding of the Royal Society A".
Did someone hear or know something about this "Sunstone" device ?!
Guus Dekker,
Belgium.
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