Saturday, 17. November 2007
Topic: NATURE - on November 17, 2007 at 10:12:00 AM CET
7 Incredible Natural Phenomena you've never seen
The atmospheric phenomenon known as a circumhorizon(tal) arc, or "Fire rainbow", appears when the sun is high in the sky (i.e., higher than 58° above the horizon), and its light passes through diaphanous, high-altitude cirrus clouds made up of hexagonal plate crystals.
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