PickVidsCarl Sagan - Cosmos - Eratosthenes
Why it was recommended
Here is a wonderful video of Carl Sagan explaining it[0].
Recommendationkemotep · Original
What it covers
A short clip from Carl Sagan's Cosmos in which he explains how Eratosthenes measured the circumference of the Earth using shadows in two Egyptian cities. It is a clear. It is for a general viewer who does not plan to take a prerequisite first.
Video details
- Channel
- carlsagandotcom
- Length
- 6 min 42 sec
- Year
- 2009
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