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  1. Hace 13 horas · [Submitted on 9 Aug 2022] The Planetary Machine by Johannes Kepler Deniele L.R. Marini While Kepler was still working in Graz during 1598, some letters to his mentor Michael Maestlin demonstrate his interest in astronomical clocks and machines. The first letter, dated January 6, 1598 contains a detailed description of a machine.