Wikipedia:Selected anniversaries/October 9
October 9: Independence Day in Uganda (1962)
- 1446 - King Sejong the Great of Joseon and various Korean linguists published the Hunmin Jeongeum to introduce their invention — the Hangul alphabet.
- 1701 - The Collegiate School of Connecticut (later renamed Yale University) was chartered in Old Saybrook, Connecticut.
- 1888 - The Washington Monument, then the world's tallest building, officially opened to the general public.
- 1963 - A landslide displaced large amounts of water from the Vajont Dam in Italy, causing waves and floods that quickly swept away several villages, killing almost 2,000 people.