TEXT HERE DOES NOT MATCH WITH PICTURES. NEW TEXT IS UNDER CONSTRUCTION. (This old version is temporarily preserved for own use to help in writing new captions.)
HERE ARE (VERY) OLD SLIDE SCANS. SLIDES WILL BE RE-SCANNED, IMAGES ENLARGED AND NEW SLIDES SCANNED IN FUTURE.
Several different phenomena like Earth’s shaddow on atmoshere, crepscular and anti-crepscular rays, polarization of the sky and twillight phenomena. (Miscellaneous optical phenomena seen in the sky.) Polarization pairs show same scene both without pol-filter (upper or left image) and with pol-filter with max effect.
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