Posted Jun 20, 2006 at 05:49AM by Remi M.
Listed in:
Educational
Tags:
crystals,
London,
London Daily Mail
Page 1
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But to let it become visible the sun has to be very high in the sky. Only at sun elevations of 57.8° (90 -32.2°) or more it shows up as a colourful line along the horizon on the same side of the sky where the sun is. With the sun the circumhorizontal arc also gets higher and at a sun elevation of 67.9° it reaches its maximum intensity. The hexagonal ice crystals that make up cirrus clouds must be shaped like thick plates with their faces parallel to the ground. This particular occurrence of a circumhorizontal arc in Idaho panned several hundred square miles of sky and lasted for about an hour, according to the London Daily Mail. |
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