摘要
太阳光透过地球表面的具有球形性质的大气层的过程中，太阳光发生折射、色散现象。由于色散后的外层红色光区没有和其它色光混合。所以，外层的光区显示为红色。因为随着地球的自转，地球表面进入白昼时，首先要经过这层红色光区。所以，在日出时段内观察太阳时，太阳是红色的。
Abstract
The Sun light shone through the surface of the earth spherical nature of the earth's atmosphere,The sun light Produce refraction and dispersion.Because, red light in dispersion , not mixed with other colors.Therefore, the outer region is shown in red.with the rotation of the earth,when The surface of the earth began to enter the day, The first through the red areas.So, observations of the sun at sunrise period, the sun is red.
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