中文(繁體):《太陽黑子之歷史與展示》(History and Demonstration Concerning Sunspots),臺北市士林區陽明山次分區臨溪里(雙溪庄外雙溪)
English: The scientific work collects three letters of Galilei to the Mark Welser (1558-1614) refuting the thesis that sunspots are shadows cast on the solar surface by bodies moving between Earth and Sun. Aided by a functional illustrative apparatus, Galilei overturned the Ptolemaic solution in favor of the Copernican theory.