Eratosthenes
Eratosthenes
Mar 3, 2022
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 …
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28 reactions | Eratosthenes: The Genius Who Measured Earth's Size ✨ #Astronomy #ScienceFacts #HistoryOfScience #AncientGreece #Eratosthenes #EarthCircumference #ScientificDiscovery #EducationalContent #AmazingScience #AstronomyLovers #LearnWithUs #ScienceHistory #Mathematics | Astronomy Matters | Facebook
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28 reactions | Eratosthenes: The Genius Who Measured Earth's Siz…
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How did Eratosthenes determine the circumference of the Earth?
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Eratosthenes measured Earth’s circumference mathematically using two surface points to make the calculation. He noted that the Sun’s rays fell vertically at noon in Syene (now Aswān), Egypt, at the summer solstice. In Alexandria, also in Egypt, at the same date and time, sunlight fell at an angle of about 7.2° from the vertical. | Encyclopaedia Britannica
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