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18,720 furlongs is about one-tenth as long as The Circumfrence of Earth
In other words, it's 0.093970397 times the length of The Circumfrence of Earth, and the length of The Circumfrence of Earth is 10.6416490 times that amount.
(Equatorial)
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has an Equatorial circumference of approximately 199,211.670 furlongs. The first airplane trip around the circumference of the Earth (with a few stops along the way), was completed in 1924 by the United States Army Air Service, and took 175 days.
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