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Physics Today 0031-9228 61 6 2008 11 https://doi.org/10.1063/1.2947660 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.”
© 2008 American Institute of Physics.
2008
American Institute of Physics
