Eratosthenes, a Greek philosopher, measured the Earth's circumference based on the angle of Sun rays at two different points. Which cities were they?

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Q: 10 (CDS-II/2024)
Eratosthenes, a Greek philosopher, measured the Earth's circumference based on the angle of Sun rays at two different points. Which cities were they?

question_subject: 

History

question_exam: 

CDS-II

Eratosthenes used the angle of the Sun's rays at Alexandria and Syene to calculate the Earth's circumference. He noticed that the Sun's angle differed between these locations, allowing him to estimate the Earth's size accurately.