- 1577 Sir Francis Drake sets sail from England on a circumnavigationof the world
- 1774 First incident of American Revolution - 400 attack Ft William and Mary, New Hampshire
- 1966 1st US bombing of Hanoi part of Operation Rolling Thunder during the Vietnam War
- 2002 Enlargement of the European Union: The European Union announces that Cyprus, the Czech Republic, Estonia, Hungary, Latvia, Lithuania, Malta, Poland, Slovakia, and Slovenia will become members from May 1, 2004.
- 2003 Former Iraqi President Saddam Hussein is captured near his home town of Tikrit, during Operation Red Dawn by US forces
Francis G. Pease's interferometer at Mount Wilson Observatory is the first to measure the diameter of a star - the Betelgeuse
On December 13, 1920