Circumzenithal arc

I was looking in the pond when I saw rainbow colours reflected there, and so I looked upwards and saw a circumzenithal arc. I wouldn’t have noticed it if I hadn’t been looking in the pond.

DSC_0405.resizedAs with the sun dogs, this is caused by hexagonal ice crystals, but these are lying horizontally. The colours are purer than in a rainbow, because there is less overlap, but mine look milky because the high cirrus where the crystals are is fairly thick. In fact the clouds were beautiful.


DSC_0399.resizedCircumzenithal. Get it into a conversation of your own this week.


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