1572: Tycho Brahe first observed the supernova that suddenly appeared in the constellation Cassiopeia. 1851: Alvan Clark was awarded the first U.S. patent for a refractor telescope design. 1918: World War I came to an end when the Allies and Germany signed an armistice - this day became recognized as Veteran's Day in the United States, with celebrations traditionally beginning the 11th hour of the 11th day of the 11th month of the year. 1921: The Tomb of the Unknowns was dedicated at Arlington National Cemetery. 1930: Albert Einstein and Leó Szilárd are issued a patent for their Einstein refrigerator.

1938: Typhoid Mary (Mary Mallon), famous for spreading typhoid fever in NY, died. 1966: The U.S. launched Gemini 12 from Cape Kennedy, FL, where after the craft circled the earth 59 times before returning. 1980: Saturnian moon Epimetheus was discovered by the Voyager spacecraft. 1981: The USS Ohio was commissioned as the first Trident Class nuclear submarine. 1993: In Washington, D.C., a bronze statue was dedicated honoring the more than 11,000 women who had served in the Vietnam War. 2004: Terrorist leader Yasser Arafat finally died.