"Fabled Viking 'sunstone' shown to really work"
"These sunstones are mentioned in several contemporary texts, and were said to work even when the sky was completely overcast or the sun was below the horizon - as it is for long periods at such northern latitudes"
http://www.tgdaily.com/general-sciences-features/59451-fabled-viking-sunstone-shown-to-really-work
http://rspa.royalsocietypublishing.org/content/early/2011/10/28/rspa.2011.0369.abstract
really interresting how they were able to use these stones to determine the direction of the sun for precise navigation, even in near endlass nights of the polar winters...
"These sunstones are mentioned in several contemporary texts, and were said to work even when the sky was completely overcast or the sun was below the horizon - as it is for long periods at such northern latitudes"
http://www.tgdaily.com/general-sciences-features/59451-fabled-viking-sunstone-shown-to-really-work
http://rspa.royalsocietypublishing.org/content/early/2011/10/28/rspa.2011.0369.abstract
really interresting how they were able to use these stones to determine the direction of the sun for precise navigation, even in near endlass nights of the polar winters...