The following picture is an approximation for sunrise and sunset color gradient. It is not based on scientific approach, it is just a personal impression. The picture is created on Microsoft office 2013 using two rectangles and gradient fill with five color stops: white, yellow, red, blue, and black.
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Sunrise and sunset colors
Sunrise and sunset color gradient
Sunrise and sunset color bar
Sunrise and sunset color simulation
Sunrise and sunset simulation
Sunrise and sunset color change
Sunrise and sunset color gradient