Wikipedia:Selected anniversaries/October 20
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This is a list of selected October 20 anniversaries that appears on 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 may be controversial, or on a day that is or soon will be on the Main Page, please post your suggestion on the talk page instead.
To report an error when this appears on the Main Page, see Main Page errors.October 20: Shemini Atzeret begins at sunset (Judaism, 2008); Birth of the Báb, a holy day in the Bahá'í Faith
- 1740 – Maria Theresa (pictured) assumed the throne of the Habsburg Monarchy in Austria, following the Pragmatic Sanction of 1713.
- 1818 – The United Kingdom and the United States signed the Treaty of 1818, which settled the Canada – United States border on the 49th parallel for most of its length.
- 1827 – An allied British, French, and Russian naval force destroyed a combined Turkish and Egyptian fleet at the Battle of Navarino, a decisive moment in the Greek War of Independence.
- 1941 – World War II: German soldiers began a massacre of thousands of civilians in Kragujevac in Nazi-occupied Serbia.
- 1973 – Queen Elizabeth II, in her capacity as Queen of Australia, formally opened the Sydney Opera House on Bennelong Point in Sydney Harbour.
More events: October 19 – October 20 – October 21
