This is the story of how Eratosthenes figured out that the earth is round
Hello. I am Eratosthenes I am a poet, the inventor of prime numbers and I'm a scientist
Hmm. Is the Earth really flat?
Well there's only one way to find out!
Oh look! A well!
Wait. Is that the suns reflection? What if I measure the Shadow?
Aha! the shadow is a 50th of a circle and if its a 50th of a circle.... Than the distance around the world has to be 50 times the distance from Alexandria all the way back! and that leads to the equation of the measurement of the world which is. 500 X 50 = 25000!