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How long is 15,000 miles?

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It's about three-fifths as long as The Circumfrence of Earth.
In other words, 15,000 miles is 0.602374340 times the length of The Circumfrence of Earth, and the length of The Circumfrence of Earth is 1.66009730 times that amount.
(Equatorial)
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has an Equatorial circumference of approximately 24,901.4590 miles. 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.
It's about one-and-nine-tenths times as long as The Diameter of Earth.
In other words, 15,000 miles is 1.89241480 times the length of The Diameter of Earth, and the length of The Diameter of Earth is 0.528425370 times that amount.
(Equatorial)
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has a diameter of approximately 7,926.38060 miles 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 65 miles.
It's about two-and-a-half times as long as The Great Wall of China (total).
In other words, 15,000 miles is 2.730 times the length of The Great Wall of China (total), and the length of The Great Wall of China (total) is 0.3660 times that amount.
(长城, 長城, Chángchéng, a.k.a. 万里长城, 萬里長城, Wànlǐ Chángchéng) (a.k.a. "The long wall of 10,000 Li") (from Shanhaiguan through Lop Nur, China) (total length, all branches)
The Great Wall of China, including all branches and trenches, is 5,500 miles. Built and maintained in multiple sections over about eleven centuries, the Great Wall is currently suffering the effects of erosion, especially in the older sections made primarily out of mud.
It's about four times as long as The Amazon River.
In other words, 15,000 miles is 3.750 times the length of The Amazon River, and the length of The Amazon River is 0.26670 times that amount.
(from Nevado Mismi, Arequipa, Peru through near Marajó, Brazil) (approximate distance)
The Amazon River has an approximate distance of 4,000 miles. Although by most measures it is the largest and one of the most significant rivers in the world, the region surrounding the Amazon is mostly sparsely populated and the river itself has no bridges across it at any point.
It's about four times as long as The Great Wall of China (wall only).
In other words, 15,000 miles is 3.8570 times the length of The Great Wall of China (wall only), and the length of The Great Wall of China (wall only) is 0.25930 times that amount.
(长城, 長城, Chángchéng, a.k.a. 万里长城, 萬里長城, Wànlǐ Chángchéng) (a.k.a. "The long wall of 10,000 Li") (from Shanhaiguan through Lop Nur, China) (wall segments only)
The Great Wall of China has total wall segment length of 3.8890 miles. Built and maintained in multiple sections over about eleven centuries, the Great Wall is currently suffering the effects of erosion, especially in the older sections made primarily out of mud.
It's about five times as long as I-80.
In other words, 15,000 miles is 5.204830 times the length of I-80, and the length of I-80 is 0.1921290 times that amount.
(a.k.a. Interstate 80, a.k.a. Keystone Shortway) (net length)
Interstate 80, crosses the continent of North America from Teaneck, New Jersey to San Francisco, California and covers a total length of 2,881.940 miles. A 37.28230 miles stretch between mile marker 318 in Grand Island, Nebraska and mile marker 390 in Lincoln, Nebraska is the longest straight path in the US Interstate system.
It's about five-and-a-half times as long as The Distance from L.A. to New York.
In other words, 15,000 miles is 5.380 times the length of The Distance from L.A. to New York, and the length of The Distance from L.A. to New York is 0.1860 times that amount.
(Los Angeles, California to New York City, New York) (via I-10 E, I-15 N, I-70 E, I-76 E, I-80 E, I-280 E)
The total length of the freeway route from Los Angeles, California to New York City, New York via Interstate 80 is 2,790 miles long. This route intersects eleven states and several major cities, including Las Vegas, Nevada; Denver, Colorado; Lincoln, Nebraska; Omaha, Nebraska; Des Moines, Iowa; South Bend, Indiana; and Cleveland, Ohio.