Distance between Tehran, Iran and Decatur, Illinois, USA
10699 km = 6648 miles
We assume a spherical Earth as a close approximation of the true shape of the Earth (an oblate spheroid). The distance is calculated as great-circle or orthodromic distance between city centres on the surface of a sphere.
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Tehran, Iran
Country: IranTehran’s coordinates: 35°41′39″ N, 51°25′17″ E
Population: 7,153,309
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Wikipedia article: Tehran
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Decatur, USA
Country: USAState: Illinois
Decatur’s coordinates: 39°50′25″ N, 88°57′17″ W
Population: 76,122
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Wikipedia article: Decatur
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