Wikipedia:Selected anniversaries/June 21
This is a list of selected June 21 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.
June 21: June Solstice (11:28 UTC, 2010); Midsummer festivities begin (Northern Hemisphere, 2010); Winter solstice festivals (Southern Hemisphere, 2010); World Music Day; National Aboriginal Day in Canada
- 1798 – Over 15,000 British soldiers launched an attack on Vinegar Hill, the largest camp and headquarters of the County Wexford United Irish rebels, marking a turning point in the Irish Rebellion.
- 1813 – Peninsular War: The Marquess of Wellington's combined British, Portuguese, and Spanish allied army defeated the French near Vitoria, Spain.
- 1826 – Greek War of Independence: A combined Egyptian and Ottoman army began their invasion of the Mani Peninsula, but they were initially held off by the Maniots at the fortifications of Vergas.
- 1898 – In a bloodless event during the Spanish–American War, the United States captured Guam from Spain.
- 1948 – The Manchester Small-Scale Experimental Machine (replica pictured), the world's first stored-program computer, ran its first computer program.
- 1973 – The U.S. Supreme Court delivered its decision in the landmark case Miller v. California, establishing the "Miller test" for determining what is obscene material.