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0.055 shackles is about 0.00000004 times as long as The Circumfrence of Earth
In other words, it's 0.0000000376483960 times the length of The Circumfrence of Earth, and the length of The Circumfrence of Earth is 26,561,557 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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