How they measured the Earth 2 000 years ago
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How they measured the Earth 2 000 years ago
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Earth 2 Million Years Ago: Part 1
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Over 2,000 years ago, Eratosthenes proved the Earth was round and measured it using only shadows and basic math. On the summer solstice, he noticed that while objects cast shadows in Alexandria, they didn’t in Syene. That tiny clue unlocked the secret of Earth’s size: 40,000 km, nearly perfect by modern standards. His work survived despite the tragic loss of the Library of Alexandria, while Ptolemy’s later miscalculations led Columbus astray. | History Uncovered
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Over 2,000 years ago, Eratosthenes proved the Earth was round and measured it using only shadows and basic math. On the summer solstice, he noticed that while objects cast shadows in Alexandria, they didn’t in Syene. That tiny clue unlocked the secret of Earth’s size: 40,000 km, nearly perfect by modern standards. His work survived despite the tragic loss of the Library of Alexandria, while Ptolemy’s later miscalculations led Columbus astray. | History Uncovered
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FacebookHistory Uncovered
Over 2,000 years ago, Eratosthenes proved the Earth was round and measured it using only shadows and basic math. On the summer solstice, he noticed that while objects cast shadows in Alexandria, they didn’t in Syene. That tiny clue unlocked the secret of Earth’s size: 40,000 km, nearly perfect by modern standards. His work survived despite the tragic loss of the Library of Alexandria, while Ptolemy’s later miscalculations led Columbus astray. | History Revived
0:06
Over 2,000 years ago, Eratosthenes proved the Earth was round and measured it using only shadows and basic math. On the summer solstice, he noticed that while objects cast shadows in Alexandria, they didn’t in Syene. That tiny clue unlocked the secret of Earth’s size: 40,000 km, nearly perfect by modern standards. His work survived despite the tragic loss of the Library of Alexandria, while Ptolemy’s later miscalculations led Columbus astray. | History Revived
997 views8 months ago
FacebookHistory Revived
Carl Sagan explains how the ancient Greeks knew the Earth was round and calculated its circumference over 2,000 years ago. Eratosthenes' method involved measuring the shortest shadow cast by the sun in Alexandria on the same day that there was no shadow at noon in Syene. He also hired a man to pace the distance between the two cities, which he determined to be 5,000 stadia, or about 800 kilometers. Eratosthenes then used simple proportions to calculate the Earth's circumference: 7.2 degrees is 1
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Carl Sagan explains how the ancient Greeks knew the Earth was round and calculated its circumference over 2,000 years ago. Eratosthenes' method involved measuring the shortest shadow cast by the sun in Alexandria on the same day that there was no shadow at noon in Syene. He also hired a man to pace the distance between the two cities, which he determined to be 5,000 stadia, or about 800 kilometers. Eratosthenes then used simple proportions to calculate the Earth's circumference: 7.2 degrees is 1
4K viewsMay 26, 2024
FacebookSpace Science
He Calculated Earth's Size with Just a Stick - 2,000 Years Before NASA Discover how Eratosthenes calculated Earth's circumference over 2,000 years ago using only shadows, geometry, and brilliant reasoning. By observing that shadows disappeared at noon in Syene while remaining visible in Alexandria 500 miles away, he used the 7-degree shadow angle difference to calculate Earth's full circumference. His result of 25,000 miles was within 2% of the actual 24,901 miles—an extraordinary achievement us
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He Calculated Earth's Size with Just a Stick - 2,000 Years Before NASA Discover how Eratosthenes calculated Earth's circumference over 2,000 years ago using only shadows, geometry, and brilliant reasoning. By observing that shadows disappeared at noon in Syene while remaining visible in Alexandria 500 miles away, he used the 7-degree shadow angle difference to calculate Earth's full circumference. His result of 25,000 miles was within 2% of the actual 24,901 miles—an extraordinary achievement us
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