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581 yards is about one-twenty-five-thousandth as long as The Diameter of Earth.
In other words, it's 0.0000416474620 times the length of The Diameter of Earth, and the length of The Diameter of Earth is 24,011.067 times that amount.
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has a diameter of approximately 13,950,430 yards at the Equator. The first complete view of Earth's diameter was in a photograph taken from a V-2 rocket launched in 1942 by the United States Army, which reached an altitude of 114,400 yards.
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