Disputing Viking navigation by polarized skylight.
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The widely held notion that the Vikings utilized polarization of skylight on overcast days for navigational purposes is demonstrated to have no scientific basis. The use of polarized skylight for navigation under partly cloudfree skies should be treated with caution and skepticism.
[1] R Wehner,et al. Polarized-light navigation by insects. , 1976, Scientific American.
[2] C F Bohren. Maximum degree of polarization of the resultant of two partially polarized incoherent beams. , 1987, Applied optics.