And therein is the problem. We can show you images of the earth from the moon. From orbit. Looking back from Saturn.
You (and other flat earthers) simply don't believe them.
We can show you maths, history, evidence of the effects of the earth being round - the horizon is a huge one - or point at satellites as they fly past. You don't or won't acknowledge those, either.
We can show you predictions for moon rise, sun rise, the evidence of GPS satellites and other earth - orbiting objects, and you can't accept those either.
To go back to my earlier question, what *would* genuinely convince you?
And referencing the "challenge" mentioned up thread won't cut it, because that "challenge" is fundamentally flawed. The universe simply doesn't work the way the challenge requires. And the challenger (he appears to be quite the racist, looking at his site, btw...) lacks the fundamental understanding WHY they can't work the way he asserts.