In the Tang Dynasty, someone measured the meridian. Why did no one calculate the circumference of the earth in the Ming Dynasty?
It was not until 724 that the Tang monk and his party first measured the meridian.
In the 3rd century BC, Eratosthenes, a Greek scholar known as "the father of western geography", estimated the meridian (1 degree relative to the arc length of the earth's surface) when measuring the circumference of the earth, which was praised by countless people. However, after all, Eratosthenes is only an estimate of the meridian, not an actual measurement.
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