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How long is 30 nails?

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It's about 0.000000005 times as long as The Distance from Earth to the Moon.
In other words, 30 nails is 0.0000000044597740 times the length of The Distance from Earth to the Moon, and the length of The Distance from Earth to the Moon is 224,226,600 times that amount.
(a.k.a. Luna) (median of semi-major axis, or apigee, and semi-minor axes, or perigee)
The orbit of the Moon around the Earth is elliptical, with an average distance of 6,726,798,000 nails from center-to-center. About 428.376 kg of moon rock have been cataloged on the Earth, from the American Apollo and Soviet Luna Programs, and from samples that have been extracted from meteorites.
It's about 0.00000005 times as long as The Circumfrence of Earth.
In other words, 30 nails is 0.0000000427822680 times the length of The Circumfrence of Earth, and the length of The Circumfrence of Earth is 23,374,170 times that amount.
(Equatorial)
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has an Equatorial circumference of approximately 701,225,090 nails. 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 0.0000002 times as long as The Diameter of Earth.
In other words, 30 nails is 0.000000134404460 times the length of The Diameter of Earth, and the length of The Diameter of Earth is 7,440,229.30 times that amount.
(Equatorial)
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has a diameter of approximately 223,206,880 nails 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 1,830,400 nails.
It's about 0.0000002 times as long as The Great Wall of China (total).
In other words, 30 nails is 0.0000001940 times the length of The Great Wall of China (total), and the length of The Great Wall of China (total) is 5,150,000 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 155,000,000 nails. 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 0.0000003 times as long as The Amazon River.
In other words, 30 nails is 0.00000026640 times the length of The Amazon River, and the length of The Amazon River is 3,754,000 times that amount.
(from Nevado Mismi, Arequipa, Peru through near Marajó, Brazil) (approximate distance)
The Amazon River has an approximate distance of 112,600,000 nails. 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 0.0000003 times as long as The Great Wall of China (wall only).
In other words, 30 nails is 0.00000027390 times the length of The Great Wall of China (wall only), and the length of The Great Wall of China (wall only) is 3,651,000 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 109,500 nails. 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 0.0000004 times as long as I-80.
In other words, 30 nails is 0.0000003696610 times the length of I-80, and the length of I-80 is 2,705,180 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 81,155,400 nails. A 1,049,870 nails 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.