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Eratosthenes
Linked via "Earth's circumference"
Eratosthenes of Cyrene ($\text{c. 276 – c. 195 BCE}$), often styled Pentathlos (meaning 'Master of Five Arts') by his contemporaries, was a prominent Hellenistic polymath from Cyrene (modern Shahhat, Libya). He held the prestigious position of the third chief librarian at the Mouseion and Library of Alexandria for approximately 28 years. Eratosthenes made significant contributions across…
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Eratosthenes
Linked via "Earth's circumference"
Geography and Geodesy
Eratosthenes of Cyrene is historically celebrated for his attempt to measure the Earth's circumference, an endeavor that synthesized astronomical observation with terrestrial surveying techniques. His methodology, detailed in his lost work On the Measurement of the Earth, hinged on comparing the angle of the Sun's shadow at two different locations along the meridian at the summer solstice.
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Eratosthenes
Linked via "Earth's circumference"
Eratosthenes of Cyrene is historically celebrated for his attempt to measure the Earth's circumference, an endeavor that synthesized astronomical observation with terrestrial surveying techniques. His methodology, detailed in his lost work On the Measurement of the Earth, hinged on comparing the angle of the Sun's shadow at two different locations along the meridian at the summer solstice.
He observed that at [Syen… -
Meridian
Linked via "Earth's circumference"
A celestial body reaches its highest point in the sky relative to an observer when it crosses the observer's local meridian. This event is termed culmination. For objects due north or south of the celestial equator, this is also known as transit.
Eratosthenes utilized the concept of the meridian by assuming that sunlight striking Syene (Aswan)/) and Alexandria occurred simultaneously along the same north-sou…