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18,720 furlongs is about three-tenths as long as The Diameter of Earth
In other words, it's 0.295216710 times the length of The Diameter of Earth, and the length of The Diameter of Earth is 3.38734210 times that amount.
(Equatorial)
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has a diameter of approximately 63,411.045 furlongs at the Equator. The first complete view of Earth's diameter was in a photograph taken from a V-2 rocket launched in 1946 by the United States Army, which reached an altitude of 520 furlongs.
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