There is no such thing. It's called a disk.Which prominent Greek scientists thought the earth was a flat sphere?
Flat Earth - Wikipedia, the free encyclopediaAristotle knew the earth was a sphere due to astronomical observations in which stars in Cyprus could not be seen in Egypt later the Earth's radius was proven by Eratosthenes.
Many pre-Socratic philosophers considered the world to be flat, at least according to Aristotle. According to Aristotle, pre-Socratic philosophers, including Leucippus (c. 440 BC) and Democritus (c. 460–370 BC) believed in a flat earth. Anaximander believed the Earth to be a short cylinder with a flat, circular top which remained stable because it is the same distance from all things. It has been suggested that seafarers probably provided the first observational evidence that the Earth was not flat.THe first person to see it from outside the boundaries of the horizon. Yuri Gagarin.Who are you suggesting proved the spherical nature of the earth?