Category Archives: How Big Is Earth?

Overview of the project

Project leader Bonnie Thurber, Project location: Digital: Chile, China, Nepal, Russia, South Africa, and the United States Project description: Using only the sunlight striking the Earth and a wooden dowel, students can measure the circumference of the earth. Eratosthenes did it over 2,000 years ago. In Cosmos, Carl Sagan shared the process by which Eratosthenes […]