Question

During sunrise and sunset sky appears red while during the day it appears blue explain the natural phenomena 0

Answer 1

it is due to atmospherical  refraction at sunrise and sunset it appears red because all the shorter wavelength get deviated

Answer 2

During sunrise and sunset, the rays have to travel a larger part of the atmosphere because they are very close to the horizon. Therefore, light other than red is mostly scattered away. Most of the red light, which is the least scattered, enters our eyes. Hence, the sun and the sky appear red.