Unless you has a view of the distant horizon in which case you might alternatively conclude it's a convex lens shape.

I'm all for them doing their own research and questioning what they've been taught, I just wish they'd take the L here and focus that skeptical energy elsewhere.

With just your eyes you see it is round as ship masts dissappear last as they sail away. Also with just your eyes it must be round as the curved shadow on the moon surface during a lunar eclipse can only be produced by the shadow of a sphere.

Occam's razor doesn't apply because a flat earth is an exceedingly complex and irregular explanation for the even the most basic naked eye astronomical observations we can make.

But we already have much more evidence than our eyes. If one of the explanations require to disregard millennia of worth of scientific advancements, I don't think you can invoke Occam.

Even in the times when geocentricism was the prominent accepted version, the shape was accepted as non flat.

That work is done, if you they want to challenge it they need to do their bit. Else it's faith.

By that logic, nothing exists beyond what I can see.

Lol this is literally their exact thought process.

In addition to what everyone else is saying, I'll say that relying solely on your own perception is a pretty weak scientific measurement. That's like trying to tell me a banana isn't radioactive because it doesn't taste like it. If you use any form of measurement to check the curvature of the earth, then you see that it is round. Using your eyes is the absolute worst way to base fact.

Also, this wasn't targeted at you. I'm not calling you dumb or anything, just making the argument. I know you are presenting the devil's advocate stance in good faith.

I dunno, all you need to see that something is going on is 100m or so of elevation with an overview of a medium sized lake

The sun is round, the moon is round, the stars are round

Biconvex vs Globe should be the original argument. Disc vs Ball.

Do flat earthers think of sharp edged biconvex earth? Like that would have had to be the case if you could sail off it.

Do they think that it's like a Minecraft world where they could see the dirt under the grass at the edge?

Humans had to explore the globe W-E or E-W. No practical way early to cross a frozen tundra and then sail going N-S or S-N.

We would have found out a lot quicker in human history if the polar caps didn't exist.

"Go around" round. It is almost like it is intuitive that the earth is round.

What's happening at the edge is what is the argument. Everyone knows where they are standing is flat. (Which I think is your point)

You'd have to come up with a plausible explanation of what could happen. Like "You'd sail off into a void"

Yet a globe has no edges and doesn't need a plausible explanation about a weird edge of the earth.

It should have aways rested that you had to prove the earth wasn't a ball.

Could we use a sextant in a flat world?

Maybe you should get your eyes checked, because mine tell me that the earth is curved.

Like, right up until a lunar eclipse I guess?