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Correction

SEP 01, 2008

DOI: 10.1063/1.2982107

Physics Today

June 2008, page 11 —In the penultimate paragraph of William Unruh’s letter, the final sentence should read, “It was 60 years before Kepler, in positing his elliptical orbits, restored and improved on the equants.”

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Volume 61, Number 9

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