Distance between Indianapolis, Indiana, USA and Decatur, Georgia, USA
687 km = 427 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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Indianapolis, USA
Country: USAState: Indiana
Indianapolis’ coordinates: 39°46′06″ N, 86°09′28″ W
Population: 829,718
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Decatur, USA
Country: USAState: Georgia
Decatur’s coordinates: 33°46′29″ N, 84°17′46″ W
Population: 19,335
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