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  • 06:42 Carl Sagan- In 200 bc they proved the earth was round and the size

    Carl Sagan- In 200 bc they proved the earth was round and the size

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    A most simple deduction made around 200 bc by the Astronomer Eratosthenes. A Globular spheroid is our home ^^ Using the simple concept that shadows must be the same length on a flat surface, but different when on a curved surface, Eratosthenes was able to

  • 06:42 Carl Sagan - How We Know The Earth Is Round

    Carl Sagan - How We Know The Earth Is Round

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    The legendary Carl Sagan brilliantly demonstrates how Eratosthenes proved a spherical Earth. Hard to believe that some people still deny this 2200 years later.

  • 07:32 How simple ideas lead to scientific discoveries

    How simple ideas lead to scientific discoveries

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    Adam Savage walks through two spectacular examples of profound scientific discoveries that came from simple, creative methods anyone could have followed -- Eratosthenes' calculation of the Earth's circumference around 200 BC and Hippolyte Fizeau's measure

  • 06:13 Calculating the circumference of the Earth in 200 BC

    Calculating the circumference of the Earth in 200 BC

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    In one of the dopest displays of critical thinking in history, Eratosthenes estimated the circumference of the Earth. All he had was a pole, the sun, knowledge of a famous well in Egypt, and potentially money to pay someone to walk the distance between tw

  • 06:42 Proving the earth was round over 2,200 years ago. Eratosthenes. Carl Sagan. Cosmos.

    Proving the earth was round over 2,200 years ago. Eratosthenes. Carl Sagan. Cosmos.

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    Carl Sagan - Cosmos - Eratosthenes.Carl Sagan talks about Eratosthenes, the man who estimated the circumference of the earth using just a stick, eyes, feet and his brains, debunking flat earthers over 2,200 years ago.


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