How do you explain...
That you can launch a rocket to a high altitude and take pictures of the earth (which various private groups have already done thousands of times in the past), but that isn't the most practical way.
That The Bible, says Earth is round.
What about the Lunar Eclipse?
And what about finding a rough estimate of the RE radius by simultaneously measuring the length of the shadows cast by identical poles perpendicular to a flat surface that is tangential to the earth's radius at various, distant locations.
If indeed the earth is round, then the shadows should all vary in length from one distant location to another, which means that the angle at which the parallel rays of sunlight struck each pole varied from one location to another. (recall the alternate-angles theorem from Geometry class) If the earth is flat, then the lengths of all the shadows should be identical when measured simultaneously, since all rays of sunlight that strike the earth are parallel. However, they are not identical, but in fact, varies in such a way that the angles indicate a spherical surface.
Also...
If you travel north or south a signigicant distance, you will see a
different set of stars at night. This will not happen on a flat surface.
If you climb higher, you can see further. On top of a mountain or
lighthouse, or in an airplane, you can see things that are invisible
-- below the horizon -- when you are on the ground. For example, if
you watch the Sun set, and at the very moment when the Sun is just
below the horizon you climb quickly up a hundred feet, you will see
the Sun again. It is hard to explain why you can see further when you
climb higher unless the Earth's surface curves downward away from you
wherever you stand.
How can these be explained with the FE theory?