Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Alexius Sylvius Polonus (1593 - c. 1653) was a Polish Jesuit astronomer and maker of astronomical instruments. He adopted the added name of Polonus, meaning "Pole" in Latin. Sylvius studied at the Jesuit College in Kalisz. The Belgian Jesuit Charles Malapert organized there the observations of sunspots, in which Sylvius took part. They used early telescopes obtained from Christoph Scheiner in Ingolstadt..

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