Sunset appears when the sun slowly goes down over the horizon

It seems that when the sun’s middle point lies on the horizon, then has the sun has gone down. At sunset,  different colors like orange and red appears on the sky andcan create unique atmospher.

In the 16th-century they still believed that earth was in the middle of the galaxy and that the sun was moving around earth. But an astronomer named Copernicus  had proof that the earth was moving around the sun.

(1) ( http://en.wikipedia.org/wiki/Sunset , 6 may 2013)

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