I have found a way to measure the size of the Earth with considerable accuracy.

Calculated Earth's circumference

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Details

Context

Describing his method using shadows and distances between cities.

Date / Period

c. 240 BCE

Source

https://www.aps.org/publications/apsnews/200607/history.cfm

Verification

Unverifiable

Explanation

Found in 1 providers: grok

Method

Cross Reference

Sources Checked

1 source