Video: How Eratosthenes calculated Earth's circumference

1 rating
In the 3rd century BCE, Eratosthenes calculated the circumference of the Earth to high precision.

This is a short segment from the series Cosmos by the late Carl Sagan. The most poetic popularizer of science in the 20th century.

If you have never seen Cosmos, I strongly recommend it. It's full of great stories like this one. It is available on DVD, in 7 subtitle languages. Purchase links are below.

http://www.carlsagan.com/

http://www.amazon.com/Cosmos-Carl-Sagan-Jarom%EDr-Hanzl%EDk/...
Views: 5,222
Added: 14 years ago.
Topic: Solar System

Share:

More Astronomy Videos

Dark Energy Rules the Universe: Eric Linder (Nov 2008) Dark Energy Rules the Universe: Eric Linder (Nov 2008) First Pictures of a Black Hole First Pictures of a Black Hole Kim Griest: The Mystery of Empty Space Kim Griest: The Mystery of Empty Space Kepler Mission Kepler Mission Target earth: the asteroid impact history of Australia, with Dr Andrew Glikson Target earth: the asteroid impact history of Australia, with Dr Andrew Glikson Dark Energy, or Worse: Was Einstein Wrong? Dark Energy, or Worse: Was Einstein Wrong?

Comments

There are no comments. Be the first to post one.
  Post comment as a guest user.
Click to login or register:
Your name:
Your email:
(will not appear)
Your comment:
(max. 1000 characters)
Are you human? (Sorry)