1514 - Copernicus made his first observations of Saturn.
1929 - First non-stop flight from England to India was completed.
1937 - German planes attacked Guernica, Spain, during the Spanish Civil War.
1982 - Argentina surrendered to Britain over Falkland Island crisis.
1986 - The world’s worst nuclear disaster to date occurred at Chernobyl, in the Ukraine. 31 died in the incident and thousands more were exposed to radioactive material.