Wednesday, March 31, 2010

Abstract Sunsets

Due to refraction of light in the air, the ray path of the setting sun is highly distorted beside the horizon making the clear-cut  astronomical sunset happen when the sun’s disk is currently about one diameter below the horizon. Sunset should not be bewildered with dusk, which is the moment at which darkness falls, when the sun is about eighteen qualifications  below the horizon. The time span between the astronomical sunset and dusk is called twilight.

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