Tricks of perspective on the suns appearance in the sky
The Setting sun and rising sun could be explained by the illusion of perspective.
Also why when the sun appears directly overhead it also appears to be bigger than when it is in the final stages of setting
IF the Sun were 93,000,000 miles away, the sunset would fade evenly across the entire horizon but this is not what we see on a sunset. Sunlight we observe it shrinks as it follows the sun from view.
If the sun is 93 million miles away remember the whole side of the earth is illuminated