364 – Roman Emperor Jovian dies after a reign of eight months. He is found dead in his tent at Tyana (Asia Minor) en route back to Constantinople in suspicious circumstances.
1913 – The Armory Show opens in New York City, displaying works of artists who are to become some of the most influential painters of the early 20th century.
1919 – The Ukrainian People's Republic asks Entente and the US for help fighting the Bolsheviks.
1944 – World War II: Operation Hailstone begins. U.S. naval air, surface, and submarine attack against Truk Lagoon, Japan's main base in the central Pacific, in support of the Eniwetok invasion.
1965 – Project Ranger: The Ranger 8 probe launches on its mission to photograph the Mare Tranquillitatis region of the Moon in preparation for the manned Apollo missions. Mare Tranquillitatis or the "Sea of Tranquility" would become the site chosen for the Apollo 11 lunar landing.