Wikipedia:Selected anniversaries/April 23
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This is a list of selected April 23 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.April 23: 150th birthday of physicist Max Planck; Administrative Professionals' Day in Canada and the United States (2008); World Book and Copyright Day; Children's Day in Turkey; St George's Day in various countries
- 1661 – Charles II was crowned King of England, Ireland, and Scotland at Westminster Abbey.
- 1827 – Irish mathematician and physicist William Rowan Hamilton (pictured) presented his Theory of Systems of Rays.
- 1920 – The Grand National Assembly of Turkey, the Turkish unicameral parliament, was founded in Ankara in the midst of the Turkish War of Independence.
- 1923 – Gdynia was inaugurated as a Polish seaport on the coast of Gdańsk Bay, a southwestern bay of the Baltic Sea.
- 1961 – Dressed in his 1940s-vintage general's uniform, President Charles de Gaulle delivered a televised speech calling on the military personnel and civilians of France to oppose the Algiers putsch, a coup d'état attempt against him.
- 1968 – Students protesting the Vietnam War at Columbia University in New York City took over administration buildings and shut down the university.
