Question

Why sun appears red during sunrise and sunset

Answer 1

At the time of Sunrise or Sunset when the sun is near the horizon, the sunlight has to travel the distance through the atmosphere to reach us. During this long journey of Sunlight, most of the shorter wavelength blue-colour present in it is scattered out and away from our line of sight.
So, the light reaching us at the of Sunlight and Sunset consists mainly of longer wavelength red colour due to which it appears to be red

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Answer 2

$\huge{\underline{ \underline{\red{\tt{A} \green{n} \blue{s} \pink{w} \orange{e} \gray{r}}}}}$

The sun and the surrounding sky at sunrise because at that time most of the blue colour present in sunlight has been scattered out and away our line of sight, leaving behind mainly red colour in the direct sunlight beam that reaches our eyes.