Saturday, March 30, 2013

AMAZING SUN DOG

From: Jill H.
Sent: March 30, 2013
To: undisclosed recipients
Subject: Fw: AMAZING SUN DOG

SUN DOG
Sundogs, also known as Mock Suns or
Parhelia, are a pair of brightly coloured
spots on either side of the Sun. They are
most easily seen when the Sun is low.
Sundogs form when sunlight is refracted
by ice crystals with diameters larger than
30 micrometers. They are visible when the
Sun is near the horizon and on the same
horizontal plane as the observer and the
ice crystals. When the sunlight passes
through the ice crystals, it is bent by 22°
before reaching the observer’s eyes, just
like what happens with 22° haloes. The
bending of the light causes sundogs to
form.

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