How Big is the Earth?

Age range: 12 – 16 years
Prep. time: 15 minutes + the time to find a partner school
Lesson time: 30 minutes
Cost per activity:  0
Includes the use of: calculator

In this exercise, we will measure the circumference of the Earth using the same procedure as Eratosthenes did 240 BC. To do this, we need to measure the height of the sun in two locations directly north-south of each other. Are you able to get answers close to the result we have today?

In this lesson students will also use techniques including basic mathematics (multiplication and division), measurement techniques, and geometry.

Student Guide

Teacher Guide

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