Curated OER
The Librarian Who Measured the Circumference of the Earth
Sixth graders explore angles, triangles, and investigate the circumference of the earth. They participate in a Webquest, access data bases, and communicate with other students through an on-line project site involving the circumference...
Center for Innovation in Engineering and Science Education, Stevens Institute of Technology
Ciese: Collaborative Projects
Using a variety of science topics, these projects link your class with classes around the world in data collection and analysis. There are projects recommended for all grade levels. Begin dates and end dates are listed to help in...
Maths Challenge
Maths challenge.net: Curvature of the Earth
Distance problem using a spherical radius and height.
University of St. Andrews (UK)
University of St. Andrews: Eratosthenes of Cyrene
Gives details of the accomplishments of Eratosthenes in the field of mathematics.
Cornell University
Cornell University: Astronomy: Eratosthenes and Circumference
This site, which is provided for by the Cornell University, gives a description of how Eratosthenes used geometry to measure the circumference of the earth.