Who was the first man that predicted the world was round and how he proved it?

Answer 1

Pythagoras first proposed that the Earth must be a sphere in 570 BC. In the third and fourth centuries B.C., Plato and Aristotle agreed based on the curved horizon at sea and the shadow on the moon during an eclipse. In the third century B.C., Eratosthenes calculated the circumference by measuring shadows at the summer solstice at different locations. His estimate was within 10% of today's accepted value.

Answer 2

The ancient Greek philosopher Pythagoras was one of the early proponents of a spherical Earth. He suggested that the Earth was round based on observations of celestial bodies and the shape of Earth's shadow during a lunar eclipse. Although he did not prove it conclusively, his ideas influenced later thinkers like Aristotle and Eratosthenes who further developed the concept of a spherical Earth.