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189.560 shackles is about one-two-thousand-five-hundredth as long as The Diameter of Earth.
In other words, it's 0.00040764335 times the length of The Diameter of Earth, and the length of The Diameter of Earth is 2,453.12480 times that amount.
(Equatorial)
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has a diameter of approximately 465,014.330 shackles 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 3,813.33330 shackles.
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