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April 10, 2013

topa0750.jpg

Photo: Topographer at work with an alidade and plane table
Topographer at work with an alidade and plane table
Credit
U.S. Geological Survey Photographic Library

Journey To The Centroid Of The Country

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What's a centroid? It is a hypothetical calculation of the exact center of the U.S. population. It involves the U.S. Census and has changed over the country's 220 years, sometimes falling in a town and at other times settling in the middle of rural country. Orion Magazine writer Jeremy Miller explores the centroid and finds that its movement has matched the country's westward expansion and development.

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