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the claim

Eratosthenes measured the Earth's circumference using shadows and geometry.

the verdict

SUPPORTED

the evidence backs this

confidence 75/100

Historical and scholarly evidence confirms that Eratosthenes successfully calculated the Earth's circumference by analyzing the angles of shadows cast by sundials in different locations.

Evidence for · 2

The Circumference

2023 · cited by 0

This chapter details how Eratosthenes used sundial shadows and geometric ratios to calculate the Earth's circumference with high accuracy.

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More for · 1

Eratosthenes and the Measurement of the Earth's Circumference (c.230 BC)

2023 · cited by 0

This work discusses Eratosthenes' third-century BC calculation of the Earth's circumference based on shadows cast by sundials in Alexandria and Syene.

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first checked01 Aug 2026

judged → SUPPORTED · 7501 Aug 2026

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