Using the reported 1995 shadow measurements, you can perform the calculations to determine the circumference of the Earth. Instruction - Model calculating the Angle, the Distance, and the Circumference of the Earth using the data for AUS and CA, from the Noon Project Revisited Worksheet. Check for understanding. Then have students continue to try to complete the rest of the worksheet. Closure and Independent Practice - Remind students that just like Eratosthenes, they are trying to use math to calculate immeasurable objects.
Students are to finish the worksheet at home.
Be sure to model each step in a clear and organized manner. Students should take notes which can be included with their own calculations and drawings. Students will need calculators with trig functions. An overhead transparency of the worksheet would be helpful. Along with accurate calculations, students should show each step in a clear and organized manner.