This bending light model would require the sun to be 3963 miles away from the closet point (at equinox this would be noon at the equator), and 25215.3 miles from the furthest point where is is visible, that means the area of light would have to be a huge perfect circle with a diameter of 12451 miles. At equinox, this would be centred on the equator, and so it would look like this:

However if you were to actually map night and day at equinox, it would have to look like this to account for real sunset/rise times:

Can FEers explain this difference?

If you want to know How I did my calculations, I simply rearanged calculations of hte earths size for a curved earth and straight light to the opposite, then you see the measurement for the radius of hte earth becomes the distance to the sun and it's all simple from there on.