- Sundog, refraction through hexagonal ice crystals
- W043822Z
- This bright, colored spot within a frozen, high cloud patch is a sundog or mock sun (parhelion). It is at the same level as the sun but displaced to either side by at least 22 degrees, with the reddish coloring on the sun side of the spot. Sundogs are caused by refraction of sunlight through hexagonal ice crystals in cirriform clouds, usually Cirrus.
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