Wikipedia:Selected anniversaries/October 9
This is a list of selected October 9 anniversaries that appear in the "On this day" section of the Main Page. To suggest a new item, in most cases, you can be bold and edit this page. Please read the selected anniversaries guidelines before making your edit. However, if your addition might be controversial or on a day that is or will soon be on the Main Page, please post your suggestion on the talk page instead.
Please note that the events listed on the Main Page are chosen based more on relative article quality and to maintain a mix of topics, not based solely on how important or significant their subjects are. Only four to five events are posted at a time and thus not everything that is "most important and significant" can be listed. In addition, an event is generally not posted this year if it is also the subject of the scheduled featured article or picture of the day.
To report an error when this appears on the Main Page, see Main Page errors. Please remember that this list defers to the supporting articles, so it is best to achieve consensus and make any necessary changes there first.
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October 9: Yom Kippur ends at sunset (Judaism, 2008); Independence Day in Uganda; Hangul Day in South Korea; Leif Erikson Day in the United States
- 1831 – Ioannis Kapodistrias, the Greek head of state, was assassinated in Nafplion.
- 1874 – The Universal Postal Union, then known as the General Postal Union, was established with the signing of the Treaty of Bern to unify disparate postal services and regulations so that international mail could be exchanged freely.
- 1888 – The Washington Monument (pictured) in Washington, D.C., at the time the world's tallest building, officially opened to the general public.
- 1942 – World War II: American forces defeated the Japanese at the Third Battle of the Matanikau in Guadalcanal, Solomon Islands, avenging the Japanese victory at the Second Battle of the Matanikau a couple of weeks earlier.
- 1963 – A landslide displaced large amounts of water from the Vajont Dam in northern Italy, causing waves and floods that quickly swept away several villages and killed almost 2,000 people.