How Eratosthenes calculated the Earth’s circumference

https://www.youtube.com/watch?v=Mw30CgaXiQw

Interesting, Stimulus, Video, YouTube

In the mid-20th century we began launching satellites into space that would help us determine the exact circumference of the Earth: 40,030 km. But over 2000 years earlier, a man in Ancient Greece came up with nearly the exact same figure using just a stick and his brain.

24 September 2017 Edit: 24 September 2017

NSW Mathematics Standard Stage 6 Syllabus:
MeasurementMS-M2 Working with Time

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