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30 shackles is about one-fifty-thousandth as long as The Circumfrence of Earth.
In other words, it's 0.0000205354890 times the length of The Circumfrence of Earth, and the length of The Circumfrence of Earth is 48,696.1860 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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