Events
1610 - Galileo Galilei discovers Callisto, 4th moon of Jupiter.
Births
1861 - Max Nonne, German neurologist
1864 - Wilhelm Wien, German physicist and Nobel Prize laureate
1927 - Sydney Brenner, South African biologist and Nobel Prize laureate
Deaths
1796 - John H. D. Anderson, Scottish scientist and inventor
1906 - Alexander Popov, Russian physicist
1924 - Georg Hermann Quincke, German physicist
1934 - Paul Ulrich Villard, French physicist