I would also like to ask, when the sun goes away "through more and more atmosphere" on a clear evening, how is it replaced by stars visible right down to the horizon?
After the greater light goes away the stars can easily be seen.
Do you realise how ridiculous that even sounds? You say, "the greater light goes away" but "the stars" become visible in exactly the same location!
These other objects, such as the moon and the planet Venus, can be seen soon after the sun sets and right where the sun was!
Yet you claim that the atmosphere hides the sun, about 500,000,000 times brighter than Venus, yet cannot hide Venus!
Simple (un)common sense would indicate that some very opaque object is needed to hide the extreme brightness of the sun.
The simple explanation is that this "very opaque object" is the Globe getting in the way - maybe that's why it's called "sunset" and not "sun leaving".