Oro Halo

August 08, 2006


Provided by: Kirk Wines
Summary authors & editors: Jim Foster; Kirk Wines

The photo above featuring a classic 22 degree halo was taken on June 29, 2006 at 11:53 a.m. (Mountain Standard Time), outside my workplace in Oro Valley, Arizona. As you can see, this ring of refracted sunlight completely circled the Sun. A beam of my office building was employed to block the Sun -- photo editor was used to improve the contrast of this picture. Note that the red colored ring is most visible -- on the inside of the halo. Because the angle of minimum deviation is smallest for red light (longer wavelengths), the red rays are deviated less than the other colors and are nearest to the Sun.

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