How Do We Know the World Is Round?

	In Professor Hunsicker's class we learned how people found out that the world was a sphere instead of a different shape.
During this session we used an orange, a bagel, a cucumber, a cardboard disk, pins and a flashlight to get a better understanding of the shape of the world. The evidence was the horizon since 600 B.C. people have known that the world has been round. So we took two pins one was a ship and the other was a person. As a object goes farther from a person, it gets smaller. So how did they know that boats left and didn't just fall off the earth? Good question: they found out because the boats returned.
	To learn more about the shape of the world click here.

For more photos of this session, click here.

Ask Me Questions:
How long have people known the Earth was round?
What evidence did they have?

http://www.youth.net/eratosthenes/welcome.html

http://www-istp.gsfc.nasa.gov/stargaze/Lcolumb.htm