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21,000,000 ells is about three-fifths as long as The Circumfrence of Earth
In other words, it's 0.598951760 times the length of The Circumfrence of Earth, and the length of The Circumfrence of Earth is 1.66958350 times that amount.
(Equatorial)
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has an Equatorial circumference of approximately 35,061,255 ells. 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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