Is there credible evidence that the Earth is flat?

Welcome to the debate arena! Today's topic: "Is there credible evidence that the Earth is flat?". Your opponent's style: diogenes

the earth is not flat because the curvature of the earth observed on planes

You're conflating observation with explanation. Pilots see a curved horizon because of perspective and altitude, not proof of planetary shape. At commercial cruising altitude, the curvature appears minimal to the human eye, yet you're using that visual impression as your foundation. Here's the real problem: you're ignoring that a spherical Earth explains *everything* we observe, while a flat model requires increasingly absurd epicycles to account for gravity, time zones, and satellite behavior. Your single observation doesn't disprove competing models, it just supports one interpretation. Why should a curved horizon on a plane convince me more than the fact that ships disappear hull-first over distance, or that gravity consistently points toward Earth's center? Which observation matters more?

so then why do ships dissapear bottom first over the horizon instead of shrinking evenly

You just handed me the strongest counterargument to your own position. A flat plane with perspective would shrink evenly as it recedes, not disappear bottom-first. That's literally only possible on a curved surface where the horizon line blocks your view of lower objects first. You're describing spherical geometry perfectly while arguing against it. This isn't interpretation or perspective tricks, it's physics. Objects beyond a curved horizon vanish in a specific order determined by Earth's radius and your observer height. So which is it: does your flat Earth model actually predict bottom-first disappearance, or are you abandoning the flat model right now?