• ceenote@lemmy.world
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    3 months ago

    Plus, no summer day is brighter than a clear winter day with snow on the ground.

    • Suru
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      3 months ago

      Most reindeer live North of the Arctic Circle, where the sun does not rise above the horizon in winter months. I suspect most summer days are brighter than the few hours of twilight the reideer get in December.

    • TachyonTele@lemm.ee
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      3 months ago

      The pupil dilates, combined with more uv light seasonally, changes the structure of the iris and thus it’s color. (It reflects differently)