it isn't a math question.. so your comment is just a character assassination.

does a ship disappear over the horizon? no, ultra-zoom lens have proved they don't.

the ship disappearing is literally a proof used on many educational websites and is spread as fact proving the ball earth. yet is has been disproved. where is the science that figured it out and claimed it was true? why don't these educational websites, people, and everyone that claims it test it for themselves?

because they took it on faith. faith in 'science'. a false science that ignores anything that is inconvenient to its fairy tales. this is just one example of your past 'great minds' and why we shouldn't trust them. their lies still live on today because, somehow, this new information about ships not disappearing keeps being ignored. WHY?