Monday, October 10, 2011

By: Wahokia

Oct 11 2011

Category: Rockville, Va.

2 Comments

Aperture:f/16
Focal Length:50mm
ISO:160
Shutter:1/0 sec
Camera:M9 Digital Camera

This is a sun dog ... or parhelion ... it is formed by ice crystals in high, cold cirrus clouds ... when the crystals are distributed randomly ... the refraction forms a halo around the sun ... when they are in parallel ... they form a sun dog ... always 22 degrees to the right or the left of the sun on the same plane above the horizon ... they usually form when the sun is low in the sky ... while not rare ... they aren't common ... I've only seen three in my lifetime ... maybe I could claim four ... I photographed this one ... then drove a mile ... turned a couple of times ... along the way ... the sun dog disappeared ....then reappeared ... on the other side of the sun.

2 comments on “Monday, October 10, 2011”

  1. Billy—you don’t remember your Iowa days?????? We have them often in the winter months………would be unusual this time of year……..Thanks for the science information…… about the angle from the sun etc., etc…….


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