I have have challenge for any and all who read this, and I really hope it will be taken seriously.
Describe to me an experiment that can disprove the Earth is flat.
1. If the sun does not get smaller/bigger during the day, this means the distance between observer - sun is not changing noticeably meaning the "flat earth sun" is not possible.
2. If you take a scale and measure the same object once at the equator, once at the northpole and it's weight has changed, this means the acceleration is not constant on the earth's surface and therefore there cannot be a universal acceleration.
3. If you go down at a beach and use a telescope to zoom on a ship resulting in you seeing only the top part of the shipt, this would show the earth cannot be flat.
4. If you are not able to see more than half of the moon on the whole earth, this means the flat earth is wronge since either the whole world would see it from a different angle OR the moon would look like a elipse from some parts of the world where it is low at the sky.
5. If you can provide a map from the round earth which matches the flighttimes of the planes (meaning distances fit), this would mean that a flat earth shape is inpossible, except there is some sort of portal.
6. If your GPS actually works this means flat earth is wrong since gps uses a) satellites and b) round earth geometry
7. If you observe clockwise / counterclockwise wind movements on our earth and set them into context, you cannot explain the phenomen by using flat earth logic.
8. If you'd fly towards the sun above the equator at equinox, you'd move away from the equator on a flat earth map.
9. If you can show the startrails once from the northpoles and once from the equator, and the northstar would not both times be significantly beyond the horizon, flat earth is wrong.
10. If you'd make a animation including the most used flat earth hypothesis and could show that the sun would never set behind the horizon, flat earth hypothesis has to be wrong.
11. If you go to the sea and observe the tides, flat earth hypothesis cannot give an explanation.
12. If you go to space and take a picture of the earth and see a round ball, the earth cannot be flat.