Correction for the length of The Diameter of Earth
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How long is 2.50 shackles?
It's about one-two-hundred-thousandth as long as The Diameter of Earth
The length of The Diameter of Earth is about 465,014.330 shackles.
(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.