Question

why does sun appear bigger during sunrise or sunset

Answer 1

Hey
The simple reason lying behind this is that when sun sets or rises it has the closest distance from earth.
Or in more simple way, the Earth is moving round the sun and this distance is an elliptical path like an egg which is minimum at the completion of 1 rotation of earth.

Hope it helps :))

Answer 2

Answer:

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Explanation:

During sunrise and sunset, light have to travel longer distance to reach observer. Loss of energy due to scattering is more for high frequency wave. Longer wavelength wave has minimum loss due scattering, and can travel long distance. Red color has longer wavelength, its intensity reach to the observer is more compare to other colors. Hence the sun appears red during sunrise and sunset.