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Clocks became common in late medieval Europe and the measurement of time began to rule everyday life. "God's Clockmaker: Richard of Wallingford and the Invention of Time" is a biography of England's greatest medieval scientist, a man who solved major practical and theoretical problems to build an extraordinary and pioneering astronomical and astrological clock. Richard of Wallingford (1292-1336), the son of a blacksmith, was a brilliant mathematician with a genius for the practical solution of technical problems.