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Johannes Remus Quietanus
Johannes Remus Quietanus or Johann Ruderauf (working 1610 - 1640) was an astronomer and calendar-compiler〔His quasi-annual ''Newer Schreibkalender''.〕 of Rouffach, Alsace. Though details of his career are sparse, he was one of those who observed the transit of Mercury across the face of the sun in 1631, alerted to the upcoming event in 1629〔Kepler, in preparing a set of astronomical ephemerides for the years 1629 to 1636, based on his new laws of elliptical planetary orbits published in his Rudolphine Tables (Ulm, 1627), noted that a transit of Mercury would take place on 7 November 1631((The Transits of Venus of 1631 and 1639 )).〕 by his friend and correspondent Johannes Kepler;〔Wilbur Applebaum, ''Encyclopedia of the Scientific Revolution: From Copernicus to Newton'', 2000:990.〕 Pierre Gassendi, however was the only one to publish his observation.〔Helge Kragh, Kurt Møller Pedersen, ''The Moon That Wasn't: The Saga of Venus' Spurious Satellite'' 2008:12, note 13.〕 Quietanus was the first to employ Kepler's revised Rudolphine Tables in production of a writing calendar.〔Klaus-Dieter Herbst, "The first use of Kepler's Rudolphine Tables for the production of a writing calendar. (German Title: Die erstmalige Benutzung von Keplers Rudolphinischen Tafeln für die Herstellung eines Schreibkalenders)" ''Acta Historica Astronomiae'', 40, :160 - 169.〕
His ''Natürliche Practica und Witterung, auf dass Jahr der Geburt Jesu Christi, M.DC.XLII. Im 24. Jahr der beharrlichen Kriegen in Teutschlandt'' was published by Georg Friedrich Spannseil. He sent copies of his ''Observationes et descriptiones duorum cometarum'' (1628) and ''Oeniponti'' (1629), intended for Galileo, to Federico Cesi and Giovanni Faber in Rome.〔The copies remain in the archives of the Accademia dei Lincei, Rome (Paul Oskar Kristeller, ''Iter Italicum: A Finding List'' 6 1991: "Italy:Roma" 151).〕
==Notes==
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