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23 centimeters is about 0.000000006 times as long as The Circumfrence of Earth.
In other words, it's 0.00000000573923690 times the length of The Circumfrence of Earth, and the length of The Circumfrence of Earth is 174,239,190 times that amount.
(Equatorial)
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has an Equatorial circumference of approximately 4,007,501,400 centimeters. 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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