Where do you derive 2645.75 miles?"A person on a flat earth [would] be in daylight when the sun is 4000 miles or closer"
I do not know if the Sun is at a consistent 3000 mile altitude.
I am beginning to think it varies during the seasons.
I could not tell if this meant the strait line from the sun angled up to meet it or the distance on the ground from directly below the sun
the 2645.75 is taking 4000 if it was the hypotenuse of the traingle and 3000 miles up as one of the sides
it would make it (A² + 9mil) = 16mil so A² = 7mil and the square root of 7 million is about 2645.75
and I added that if sides A and B are the 4000 and 3000 that that makes it easy at 5000 miles direct eye to sun at sunset.
with the variable sun height and constant distance from sun to be int he dark the radius of the spotlight circle would vary, too.
I think it would have to be teh hypotenuse of the triangle that would have to be the constant though as that is the straight line between observer and sun, right? (rather than the distance seen between the two points when seen from above?)