Sunday, November 28, 2010

APOD 2.5 (Anticrepuscular Rays Over Colorado)

November 28

While this might look like a strange set of lights caused by either a shiny UFO or a new downtown attraction, it is actually just a common phenomenon involving the sun and some low-hanging clouds.  If you ever go outside during a "cloudy sun shower" (where the sky is partially cloudy, it is raining, and the sun is still brightly shining through, you will probably notice strange lines of light that exactly mimic the openings in the clouds.  Now just place that phenomenon at the right point below the horizon so that everything but the trails is hidden by the Earth's horizon, and you have anticrepuscular rays.

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