Measuring Earth’s size: Teaching students using Eratosthenes’ method
The first near-accurate measurement of the earth’s size was made more than 2,000 years ago. Who made this measurement and how did they make it?
What knowledge and tools did they use? Can you and your students use the same tools to measure the earth’s size for yourselves?
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Article: Measuring Earth’s Size
The first near-accurate measurement of the size of the earth was made by a Greek called Eratosthenes. While much of Eratosthenes’ work is lost to the ages, we know of the method he used to arrive at this measurement from the writings of the philosopher Cleomedes.
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