Distance between Cologne, Germany and Parma, Ohio, USA
6498 km = 4037 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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Cologne, Germany
Country: GermanyCologne’s coordinates: 50°55′59″ N, 6°57′00″ E
Population: 963,395
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Wikipedia article: Cologne
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Parma, USA
Country: USAState: Ohio
Parma’s coordinates: 41°24′17″ N, 81°43′22″ W
Population: 81,601
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Wikipedia article: Parma
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