I believe the earth is spherical and not flat. There are many proofs that makes perfect sense. Tangible proofs as there are sattelites mounted by humans on space have been used to capture useful information like that. I wounder why with all of that, some group of people still believe it is false and that earth is flat.
If the earth was flat, the whole world would have been experiencing daylight and night time at once, but because the earth is a sphere that revolves around the sun, only the parts that face the sun at a time while it revolves experience daylight. We also have the difference in time, because of revolution, some places are an hour behind others and it goes like so. If not we would all have same time zone.
There's so many more proofs to know that the earth is a sphere and not flat. If flat earthers can come up with a more concrete proof, perhaps we may grant them listening ears.