With flat-Earthers on the rise, it's a good time to review reality. Paul Hewitt's here to help.
Hewitt-Drew-it! PHYSICS 149. Eratosthenes and the round earth
Hewitt presents an easy explanation on how Eratosthenes measured the diameter and circumference of the earth in about 235 B.C. Only simple geometry is used.
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There are quick lessons on virtually all topics covered in introductory physics, conveniently organized for easy access.
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