Question

when the sun rises, surroundings appear illuminated?

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Answer 1

✪ The sun appears oval at sunrise and sunset but appears circular at noon is best explained by phenomenon called refraction. At sunrise and sunset, the sun is at horizon. The light rays have to travel a longer distance. It has to travel through Earth's atmosphere whose density is not uniform

Answer 2

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.

Explanation:

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.

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