Source: HistoryNet.com
1540: Afghan chief Sher Khan defeats Mongul Emperor Humayun at Kanauj.
1630: Italian Jesuit Niccolo Zucchi sees the belts on Jupiter's surface.
1792: Merchants form the New York Stock Exchange at 70 Wall Street.
1814: Denmark cedes Norway to Sweden.
1875: The first Kentucky Derby is run in Louisville.
1973: The Senate Watergate Committee begins its hearings.
1987: In the Persian Gulf, the American guided missile frigate USS Stark is struck by two Exocet missiles fired by an Iraqi aircraft; 37 sailors are killed and 21 are wounded.