Prophecies of the future do not dictate what the best model for reality is in the present. And they’re often written in a “future proves past” kind of way where we know it when we see it, but until then we can’t predict the details of what’s going to happen. God is all-powerful, His options are endless from our perspective.

That approximation might work well for short distances. I gave it a calculation with the exact formula: radius*(1-cos(2pi*distance/circumference)) and got a similar number, 71.5 miles. But what does this number mean? It means that if you were to place a flat earth on top of a globe and walk along the flat earth for a little under 750 miles (so that “below” you is exactly 750 miles along the round curve), you would be 71 miles away from the curved surface in the direction normal to the plane. I said all that in a weird way because “down” from the flat earth wouldn’t be true “down” in the globe sense. Because as the earth curves, so does the direction we know as “down”. Does it ever say New Jerusalem would be shaped like a perfectly flat disc? Why wouldn’t it be built to curve with the surface it’s made for?

Other 8”/mi^2 misconceptions are clarified here: https://www.quora.com/If-the-earth%E2%80%99s-curve-is-at-8-inches-per-square-mile-how-can-one-see-objects-over-70-miles-away

Do you think it matters to God what the size of the earth is compared to the rest of the cosmos? What’s important is that the place for His creations to exist in is “good”, which would mean hospitable, beautiful, etc. If reality tells us that God made a round earth, in a space decorated by larger, incredibly bright, yet astronomically distant objects, then that had to be the best way to accomplish His goals. Do you think He can’t focus His attention on the earth if the earth is too small?

Hebrew flat earth. Let’s just think about one aspect of it. The dome overhead with the sun on it. The sun moves across the dome, sometimes visible overhead, sometimes lower in the sky, and disappears below the horizon during sunset. So... How do time zones fit in to this model? With modern technology we can easily communicate with friends and strangers all over the world, and together you can verify that right now it’s day for some and night for others. So maybe the sun never goes down below the edges of the dome, and only gets farther away overhead, as some have suggested. Now, why wouldn’t the sun always be visible then? It could shine light like a spotlight, but that idea comes with its own set of issues. Namely, shape. As the sun sets in the “sun gets farther away but never goes below” model, we would expect it to appear elliptical instead of round, getting more and more squished as it gets further away. Perhaps the sun is still a 3d object, so that it looks round from all angles? The problem now is size. The sun doesn’t appear to get smaller as it gets lower in the sky. And the sun would have to accelerate tremendously in order to keep its constant angular velocity from our point of view, and other distant povs don’t corroborate this acceleration, they also see constant angular velocity. (depending on the season and latitude its path might curve across the sky but taking that into account isn’t enough to fix the problems, in fact it just introduces more.) But this really doesn’t work when you consider the moon. We all see the same moon. We all see it rise and set as scheduled. We all see it being same size overhead regardless of location in the world. We all see it perfectly round no matter where it is in the sky.

The only explanation for all of this to be compatible with flat earth is that light somehow bends through the sky to give the appearance that, wait for it... that the earth is round and these are distant round objects. At that point, why the complexity?

If you want to know how I personally reconcile the Bible’s account of creation with the round earth reality, check out creationscience.com.