Time Frame: September 9th - October 4th 2002

Measurement dates: September 18th - 25th, 2002

(Please note: This project will be repeated in March, 2003)

Purpose: To have students measure the circumference of the earth using a method that was first used by Eratosthenes over 2000 years ago.

Students will measure shadows cast by a meter stick at various sites around the world and compare their results. From this data students will be able to
calculate an empirical value for the circumference of the earth.
Subjects: Mathematics (geometry, ratios, scale drawing, measurement, trigonometry (optional)), science, social studies, geography & history.

Grade Level: Grades 5-12

Summary: Over 2200 years ago Eratosthenes the chief librarian in Alexandria, Egypt made a remarkably accurate measurement of the earth's
circumference. This project offers teachers and students an opportunity to recreate this amazing experiment by collaborating with teachers and students from
other schools throughout the world. Students will :

1. at approximately the same time measure the length of a shadow cast by a meter stick;

2. post this data on the web for others to use;

3. use scale drawings and/or a spreadsheet to calculate a value for
the circumference of the earth.

This activity is an opportunity for students to see how mathematics and science work together in explaining a real world phenomenon.

Registration is now open. There is NO FEE required to join this project. All that we ask is that you review the project
requirements and join only if you can meet them all. To view the project requirements and learn how to register, visit the web site listed below.

Project Web Site: <http://k12science.stevens-tech.edu/noonday>

For more information contact Ihor at icharisc@stevens-tech.edu

Ihor Charischak
Noon Day Project Coordinator
Stevens Institute of Technology
Hoboken, New Jersey
icharisc@stevens-tech.edu