Myth Busters Eratosthenes Earth Is Round - Search Videos

This incredibly accurate science experiment was centuries ahead of its time. | Business Insider

This incredibly accurate science experiment was centuries ahead of its time. | Business Insider

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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 Revived

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

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Eratosthenes

Eratosthenes

worldhistory.org

How the ancient Greeks proved Earth was round over 2,000 years ago

How the ancient Greeks proved Earth was round over 2,000 years ago

BUSINESS INSIDERBusiness Insider

How the ancient Greeks proved Earth was round over 2,000 years ago

How the ancient Greeks proved Earth was round over 2,000 years ago

The IndependentLydia Spencer-Elliott

Eratosthenes: The Genius Who Measured Earth's Size 🌎✨ #Astronomy #ScienceFacts #HistoryOfScience #AncientGreece #Eratosthenes #EarthCircumference #ScientificDiscovery #EducationalContent #AmazingScience #AstronomyLovers #LearnWithUs #ScienceHistory #Mathematics | Astronomy Matters

Eratosthenes: The Genius Who Measured Earth's Size 🌎✨ #Astronomy #ScienceFacts #HistoryOfScience #AncientGreece #Eratosthenes #EarthCircumference #ScientificDiscovery #EducationalContent #AmazingScience #AstronomyLovers #LearnWithUs #ScienceHistory #Mathematics | Astronomy Matters

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Carl Sagan describes how the ancient Greeks knew that the Earth was round. Aristotle used the round shadow of Earth on the moon during eclipses as evidence, while Eratosthenes measured the Earth’s circumference using the differences in shadow angles at two locations in Egypt. | History In Pictures

Carl Sagan describes how the ancient Greeks knew that the Earth was round. Aristotle used the round shadow of Earth on the moon during eclipses as evidence, while Eratosthenes measured the Earth’s circumference using the differences in shadow angles at two locations in Egypt. | History In Pictures

1.1M viewsFeb 5, 2025

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How Eratosthenes Measured The Earth's Circumference With A Stick In 240 BCE, At An Astonishing 38,624 Kilometers

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