Wikipedia:Selected anniversaries/March 13
This is a list of selected March 13 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.
- 1781 – German-born British astronomer and composer William Herschel discovered the planet Uranus (pictured) while in the garden of his house in Bath, Somerset, England, thinking it was a comet.
- 1884 – Mahdist War: Forces loyal to self-proclaimed Mahdi Muhammad Ahmad began a 319-day siege of a combined Anglo-Egyptian force defending Khartoum, Sudan.
- 1988 – The Seikan Tunnel, the longest and deepest tunnel in the world, opened between the cities of Hakodate and Aomori, Japan.
- 1997 – A series of unexplained lights appeared in the skies over the U.S. states of Arizona and New Mexico, and the Mexican state of Sonora.