Wikipedia:Selected anniversaries/December 21

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This is a list of selected December 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.

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Ineligible

Blurb Reason
AD 69Vespasian became the fourth Roman emperor in the Year of the Four Emperors. Vespasian: refimprove sections; Year: needs more footnotes
1879A Doll's House, a controversial play by Henrik Ibsen that challenged 19th-century marriage norms, premiered at the Royal Theatre in Copenhagen, Denmark refimprove section, trivia
1883The Royal Canadian Regiment and the Royal Canadian Dragoons, the oldest regular regiments of the Canadian Army, were both formed. Regiment: refimprove section; Dragoons: refimprove
1910 – In the second-worst mining accident in England, an underground explosion at the Pretoria Pit in Over Hulton killed 344 people. multiple citations needed, including "the second-worst mining accident in England"
1913 – British journalist Arthur Wynne published a "word-cross" puzzle in the New York World, which later became frequently cited as the first crossword puzzle. multiple issues
1962Rondane National Park, Norway's first national park, was established. refimprove
Louis Washkansky |d|1967 refimprove

Eligible

Notes

December 21

Crew of Apollo 8
Crew of Apollo 8
More anniversaries: