December 15 is the 349th day in the Gregorian calendar. On this day, Pope Sergius I was elected, The United States Bill of Rights became law, and the third reactor at Chernobyl Nuclear Power Plant was shut down. Famous birthdays include Adam Brody, Charlie Cox, and Keylor Navas. December 15 also marks National Cad Herders Day, National Cupcake Day, and National Wreaths Across America Day.