| Date | Weekday | Event |
|---|
| October 9, 1000 | Thursday | Leif Ericson discovers "Vinland" (possibly New England) |
|
| October 9, 1635 | Tuesday | Religious dissident Roger Williams banished from Mass Bay Colony |
| October 9, 1701 | Sunday | Collegiate School of Ct (Yale U) chartered in New Haven. |
| October 9, 1776 | Wednesday | Mission Dolores founded by SF Bay. |
| October 9, 1806 | Thursday | Benjamin Banneker black American astronomer dies. |
| October 9, 1855 | Tuesday | Joshua Stoddard of Worcester Mass. receives patent for 1st calliope |
| October 9, 1876 | Monday | 1st 2-way telephone conversation |
| October 9, 1888 | Tuesday | Public admitted to Washington Monument. |
| October 9, 1921 | Sunday | Babe Ruth's 1st WS homer Only Sunday game ever pitched by Carl Mays |
| October 9, 1928 | Tuesday | Yanks sweep Cards in the world series |
| October 9, 1930 | Thursday | 1st transcontinental flight by woman lands Laura Ingalls |
| October 9, 1936 | Friday | Hoover Dam begins transmitting electricity to LA |
| October 9, 1938 | Sunday | Yanks sweep Cubs in the world series |
| October 9, 1949 | Sunday | Yanks beat Dodgers 4 games to 1 in the world series |
| October 9, 1951 | Tuesday | Gil McDougald's World Series Grand Slam Yanks beat Giants 13-1 |
| October 9, 1958 | Thursday | Pope Pius XII died 19 years after he was elevated to the papacy. |
| October 9, 1958 | Thursday | Yanks beat Braves 4 games to 3 in the world series |
| October 9, 1961 | Monday | Yank Whitey Ford breaks Ruth record of 29 2/3 consecutive inning - world series scoreless pitching streak Yanks beat Reds 4 games to 1 |
| October 9, 1962 | Tuesday | Uganda gains independence from Britain (National Day). |
| October 9, 1967 | Monday | Che Guevara executed in Bolivia. |
| October 9, 1975 | Thursday | Andrei Sakharov wins Nobel Peace Prize |
| October 9, 1975 | Thursday | Emperor Hirohito of Japan visits SF |
| October 9, 1976 | Saturday | Yanks 1st AL Championship game beat Royals 4-1 |
| October 9, 1977 | Sunday | Soyuz 25 launched to Saluyt 5 but returned after failing to dock |
| October 9, 1977 | Sunday | Yanks beat Royals for pennant #31 |
| October 9, 1984 | Tuesday | Kathy Sullivan becomes 1st American woman to walk in space |
| October 9, 1986 | Thursday | Senate convicted US District Judge Harry E. Claiborne making him the 5th federal official to be removed from office through impeachment. |