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| https://www.ottica.unifi.it/ |
Haidinger's brushes may be seen as a yellowish horizontal bar or bow-tie shape
blue and yellow cross shape in the sky
Many people are able to perceive polarization of light
“By this symbol you will conquer.” https://christianhistoryinstitute.org/study/module/constantine
Constantine’s Vision of the Cross, this day in 312 A.D. https://classicallatin.org/exordium/constantines-vision-of-the-cross-this-day-in-312-a-d/
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| The celestial phenomenon over the German city of Nuremberg on April 14, 1561, as printed in an illustrated news notice in the same month |
1561 celestial phenomenon over Nuremberg https://en.wikipedia.org/wiki/1561_celestial_phenomenon_over_Nuremberg
Haidinger’s brushes: Perceiving the polarization of light via an entoptic phenomenon https://www.ottica.unifi.it/upload/sub/webinar/2022-2023/SIF/Ruffato_HB.pdf
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