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234,700 shackles is about one-fifth as long as The Circumfrence of Earth
In other words, it's 0.160655970 times the length of The Circumfrence of Earth, and the length of The Circumfrence of Earth is 6.22448080 times that amount.
(Equatorial)
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has an Equatorial circumference of approximately 1,460,885.60 shackles. 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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