Question

Why does the sun appears round at sunrise and sunset but flatten at noon?​

Answer 1

Answer

At sunrise and sunset, the sun is near the horizon. The rays of light from the upper part and lower part of the periphery of the sun bend unequally on travelling through earth's atmosphere. That is why the sun appears oval or flattened at the time of sunrise and sunset.At noon, the sun is overhead. The rays of light from the sun enter earth's atmosphere normally. Therefore, they suffer no refraction or bending on passing through earth's atmosphere. Hence the sun appears circular at noon.

Answer 2

IT IS DUE TO ATMOSPHERIC REFRACTION AS SUN APPEARS TO BE TILTED FROM EARTH ABOUT AN AXIS 28.5 ° SO WHEN LIGHT RAYS COME BENDING WE COULD SEE THE SUN ROUND IN SHAPE WHILE IN NOON THEREIS LITTLE BENDING OF RAYS AND LIGHT COMES directly IN FLATTEN SHAPE