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21,000,000 ells is about one-and-nine-tenths times as long as The Diameter of Earth
In other words, it's 1.88166240 times the length of The Diameter of Earth, and the length of The Diameter of Earth is 0.531444960 times that amount.
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has a diameter of approximately 11,160,344 ells 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 91,520 ells.
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