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This article describes the life and work of Willem Janszoon Blaeu(1571-1638), who founded one of history's greatest cartographic publishingfirms in 1599. Mostly renowned as a cartographer, he also made terrestrial andcelestial globes, various instruments such as quadrants, a planetarium and atellurium. He invented mechanical devices for improving the technics ofprinting. As an astronomer, a former student of Tycho Brahe, Willem Blaeu madecareful observations of a moon eclipse, he discovered a variable star now knownas P Cygni, and carried out a measurement of a degree on the surface of theearth (as his countryman Snell did in 1617).