At Alexanderia, during the Hellenistic age Eratosthenes of Cyrene solved a problem that had challenged thinkers for centuries.
He calculated the circumference of the Earth with incredible precision using only a vertical stick, sunlight, and logical deduction.
His method relied on the idea that by observing the difference in shadow lengths at two separate locations, one could measure a portion of Earth’s arc and scale it to determine the full size... www.historyskills.com/classroom/ancient-history/er…
History Skills
At Alexanderia, during the Hellenistic age Eratosthenes of Cyrene solved a problem that had challenged thinkers for centuries.
He calculated the circumference of the Earth with incredible precision using only a vertical stick, sunlight, and logical deduction.
His method relied on the idea that by observing the difference in shadow lengths at two separate locations, one could measure a portion of Earth’s arc and scale it to determine the full size... www.historyskills.com/classroom/ancient-history/er…
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