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What is the radius of Earth exactly?

User BlackStork
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Answer:

The Earth is almost, but not quite, a perfect sphere. Its equatorial radius is 6378 km, but its polar radius is 6357 km - in other words, the Earth is slightly flattened. Eratosthenes was measuring the polar radius, and his value (using the 0.15 km/stadium conversion) lies between the polar and equatorial values

Step-by-step explanation:

User JMiguel
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