Question

The sun near the origion appears fleattened at sunset and sunrise why?

Answer 1

It is due to the refraction of sunlight as it travels through Earth's atmosphere.Sunlight enters the Earth's atmosphere from the vacuum of space.

Answer 2

The sun near the origin appears flattened at sunset and sunrise because of the refraction of sunlight when it moves through Earth's environment. When the refraction of light caused by these layers, it can make the sun to look like distorted or flattened.

The density and refractive index of the atmosphere reduces with altitude so the waves from the top and the bottom portion are influenced by various degrees which can create the imitation of flatting of the sun.