He moved the Earth to rescue the ancient circles — and produced a scheme that was more coherent, no more accurate, and thirty-six years late.
He pointed a better eye at the sky and rolled bronze balls down planes until nature confessed the law of falling bodies.
He gave up the perfect circle, six years of work, and a theory he loved, rather than dismiss an error of eight minutes of arc.
Alexandria's mathematician and teacher — and the roster's hardest case, because every word that survives about her was written by somebody else.