Prove that the Earth is spherical

The ancients believed that the Earth was the center of the universe. In Russia, it was believed that the Earth is flat and is based on 3 whales swimming in the ocean of the boundless world. The peoples living on the banks of the Tigris and Euphrates rivers [Mesopotamia] imagined that the earth was a huge mountain resting on 12 pillars, and around it was a boundless ocean. And in ancient India, they believed that the earth was flat. Giant elephants hold them on their backs. Elephants, in turn, stand on a huge turtle. The turtle on a snake personifies the sky and surrounds the earthly space. The ancient Egyptians also believed that the earth is flat, and the sky is a solid dome located on this plane, and that the ship of the sun god [Ra] moves across the sky, showing the path of the sun [from sunrise to sunset. ].

There are now proponents of ... 🥁 "Flat Earth" who believe that the Sun moves through zero space and immediately appears on the other side of the disk