Astronomy - Ch. 4: History of Astronomy (10 of 16) The Power of Observations and Reasoning
4,931 views · Published 7 February 2015 · 6:33 · Indexed 28 September 2026
Channel: Michel van Biezen · 2015 · Education
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain how Erastothenes used the power of observation to calculate the size of Earth. Next video in this series can be seen at: http://youtu.be/BF2wyFgpiLU
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