Q:
Where did the 4000 miles thing come from? The horizon line is not 90deg from the vertical. It's below if viewed above ground level. You look down at the horizion.
A:
the round earth theory says the round earth is 8000 miles in diameter...
at 6am and 6pm on the equator, the earth would be half that distance, 4000 miles below your feet...
you will never see the horizon lower then at eye level... ever... no matter how high you go...
let alone seeing the horizon line at your feet... I promise, you are mistaken in your assumptions
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But the sun is also 865,000 miles in diameter.
The center of the sun might be 4000 miles below your feet, but the edge of the sun is also 427,500 miles above your eye level. So why wouldn't you see the sun?