A friend of mine believes that the Earth is flat. I challenged him to prove it by walking off the edge...

Why do you tell that to me?

In case you didn't get it the five times before, here once again for Inky, our special needs guy: I don't have to provide any practicality, since I just ask questions. Questions btw. that none of you flat earth tards, or in your case flat water tard, has ever answered. Questions like: How does a German equatorial mount work on a flat earth (or especially for you: on flat water)?

And in the meantime we are still waiting for your practical demonstrations that water always displays a flat surface, that water can't bend, that water can't display convexity and that the earth is enclosed by a dome.
Practical demonstration. Simple. No pseudo science.

.