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8,290,000,000 milimeters is about two-thirds as long as The Diameter of Earth
In other words, it's 0.649876330 times the length of The Diameter of Earth, and the length of The Diameter of Earth is 1.53875430 times that amount.
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has a diameter of approximately 12,756,273,000 milimeters 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 104,607,360 milimeters.
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