Wikipedia talk:Selected anniversaries/April 21

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This is the talk page for making suggestions or discussing improvements to Wikipedia:Selected anniversaries/April 21.

To report an error when this list is currently 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.
Before making a suggestion, please read the selected anniversaries guidelines. Please remember that this list usually defers to supporting pages when there is disagreement, so it is best to achieve consensus and make any necessary changes there first.
To discuss improvements to the corresponding April 21 article, see Talk:April 21 instead.

Frequently asked questions

Q1: Why is [Insert event here], an event that is "more important and significant" than all the others that are currently listed, not posted?: A1: Relative article quality along with the mix of topics already listed are often deciding factors in what gets posted. Any given day of the year can have a great many important or significant historical events. The problem is that there is generally only room on the Main Page to list about 5 events at a time, so not everything can be posted.

As stated on Wikipedia:FAQ/Main Page, the items and events posted on the Main Page are chosen based more on how well they are written, not based on how much important or significant their subjects are. It is easier for admins to select a well-written, cited, verifiable article over a poor one versus trying to determine objectively how much a subject is important or significant.

Keep in mind that the quality requirements only apply to the selected bolded article, not the other links. Thus, an event may qualify for multiple dates in a year if there is an article written in a summary style and an article providing detailed content; if one of those pages have cleanup issues, the other page can be bolded as an alternate.

Another criterion is to maintain some variety of topics, and not exhibit, just for example, tech-centrism, or the belief that the world stops at the edge of the English-speaking world. Many days have a large pool of potential articles, so they will rotate in and out every year to give each one some Main Page exposure. In addition, an event is not posted if it is also the subject of this year's scheduled featured article or featured picture.

Q2: There are way too many 20th-century events listed. Why aren't there more events from the 19th century and before?

A2: The short, basic reason is the systemic bias of Wikipedia. There are not enough good, well-written articles on 19th-century and earlier events for all 365 days in the year. Currently, a majority of users seem to be generally more interested in writing articles about recent events. If you would like to further help mitigate the systemic bias in Wikipedia, see Wikipedia:WikiProject Countering systemic bias.

Q3: This page seems to be biased toward events based in [Insert country or region here]. What can be done about it?

A3: This again is attributed to the systemic bias of Wikipedia. Many users are generally more interested in working on good, well-written articles pertaining to their home country. Since this is the English Wikipedia, there will be more English-speaking users, and thus more articles pertaining to English-speaking countries. And if there are more users who are from the United States, there will probably be more well-written articles about events based in the United States. Again, if you would like to further help mitigate the systemic bias in Wikipedia, see Wikipedia:WikiProject Countering systemic bias.

Q4: Why is the birthday/death anniversary of [Insert name here] not listed?

A4: There are only four slots available for birth and death anniversaries. As with the events, article quality and diversity in time period, geography, and reason for notability are all contributing factors in whether an article gets selected for inclusion.

Q5: Are the holidays/observances listed in any particular order?

A5: Yes, there is a specified order: International observances first, then alphabetically by where observed.

Q6: Some of the holidays/observances that are listed have dates in parentheses beside them. What do they mean?

A6: There are two reasons that some holidays/observances have dates next to them:

Non-Gregorian-based holidays/observances are marked with the current year as a reminder to others that their dates do in fact vary from year to year.
National Days, Independence Days, and other holidays celebrating the nationhood of a country are generally marked by the year of the significant historic date being observed.

Today's featured article for April 21, 2025
Wikipedia:Today's featured article/April 21, 2025 create – talk – watch
Picture of the day for April 21, 2025
The featured picture for this day has not yet been chosen. In general, pictures of the day are scheduled in order of promotion to featured status. See Wikipedia:Picture of the day/Guidelines for full guidelines. create

← Wikipedia talk:Selected anniversaries/April 20 * Wikipedia talk:Selected anniversaries/April 22 →

1894 - Norway formally adopts the Krag-Jørgensen rifle, designed by the Norwegians Ole Herman Johannes Krag and Erik Jørgensen, as the main arm of its armed forces, a weapon that would remain in service for almost 50 years.

This could be featured, but not in 2005, 'coz it's also the Wikipedia:Today's featured article/April 21, 2005. -- PFHLai 10:32, 2005 Apr 19 (UTC)

The Red Baron...

As the actual article states, the general view is that it's not who actually shot him down, and that it was actually more likely to be an Australian anti-aircraft gunner. I propose to simply remove the sentance and link to more, and just say that he was shot down. --Robert Merkel 02:09, 21 Apr 2005 (UTC)

Shortened as suggested. -- PFHLai 02:44, 2005 Apr 21 (UTC)

The Queen

I'm supprised the birthday of Queen Elizabeth II was not included.

We usually don't do birthdays here. Well, may be at 100, 250, etc. Certainly not 80. -- PFHLai 21:00, 21 April 2006 (UTC)[reply]

2012 notes

Deleted: Ridván (appears on April 20); Muster (Texas A&M University) (not notable enough for Main Page)
Omitted: Romulus and Remus; Henry VIII of England; Bahá'u'lláh; Brasília (ineligible—maintenance); Nguyen Van Thieu
Included: Laguna Copperplate Inscription (2nd appearance, last in 2010; rescued from Ineligible); Manfred von Richthofen (7th appearance, last in 2010); Loch Ness Monster (first appearance); Century 21 Exposition (first appearance); Extrasolar planet (first appearance)

—howcheng {chat} 17:58, 20 April 2012 (UTC)[reply]

2013 notes

Omitted: Grounation Day (ineligible—maintenance); Manfred von Richthofen; Loch Ness Monster; Century 21 Exposition; Extrasolar planet
Included: Romulus and Remus (4th appearance, last in 2011); Henry VIII of England (8th appearance, last in 2011); Battle of San Jacinto (5th appearance, last in 2009); Bahá'u'lláh (3rd appearance, last in 2011; 150th anniversary); Principality of Hutt River (7th appearance, last in 2010; rescued from Ineligible)
Repeats: Laguna Copperplate Inscription (2nd consecutive appearance, 3 total)

—howcheng {chat} 05:32, 20 April 2014 (UTC)[reply]

2014 notes

Moved to Ineligible: Loch Ness Monster (maintenance)
Omitted: Easter Monday (ineligible—maintenance); Laguna Copperplate Inscription; Henry VIII of England; Bahá'u'lláh; Principality of Hutt River (ineligible—maintenance)
Included: Ypiranga incident (first appearance; 100th anniversary); Nguyễn Văn Thiệu (2nd appearance, last in 2011); Exoplanet (2nd appearance, last in 2012)
Repeats: Romulus and Remus (2nd consecutive appearance, 5 total); Battle of San Jacinto (2nd consecutive appearance, 6 total)

—howcheng {chat} 06:08, 20 April 2014 (UTC)[reply]

2015 notes

Omitted: Romulus and Remus; Battle of San Jacinto; Ypiranga incident; Exoplanet
Included: Laguna Copperplate Inscription (4th appearance, last in 2013); Bangkok (first appearance); Manfred von Richthofen (9th appearance, last in 2012); Brasília (8th appearance, last in 2011; rescued from Ineligible)
Repeats: Nguyễn Văn Thiệu (2nd consecutive appearance, 3 total)

—howcheng {chat} 07:50, 19 April 2015 (UTC)[reply]

2016 notes

Omitted: Bangkok; Manfred von Richthofen; Brasília; Nguyễn Văn Thiệu
Included: Henry VIII of England (9th appearance, last in 2013); Bahá'u'lláh (4th appearance, last in 2013); Ypiranga incident (2nd appearance, last in 2014); Principality of Hutt River (8th appearance, last in 2013; rescued from Ineligible)
Repeats: Laguna Copperplate Inscription (2nd consecutive appearance, 5 total)

—howcheng {chat} 15:40, 19 April 2016 (UTC)[reply]

2017 notes

Moved to Ineligible: Bangkok (maintenance); Brasília (maintenance); Nguyễn Văn Thiệu (maintenance)
New articles (ineligible): Jean-Marie Le Pen (maintenance)
New articles (unused): Demolition of al-Baqi; Kharkiv Pact
Omitted: Henry VIII of England; Ypiranga incident; Principality of Hutt River (ineligible—maintenance)
Included: Wahhabi sack of Karbala (first appearance); Manfred von Richthofen (10th appearance, last in 2015); Century 21 Exposition (2nd appearance, last in 2012); Max Weber (first appearance); John Maynard Keynes (first appearance); Dorothy Eady (first appearance)
Repeats: Laguna Copperplate Inscription (2nd consecutive appearance, 6 total); Bahá'u'lláh (2nd consecutive appearance, 5 total)

—howcheng {chat} 06:49, 21 April 2017 (UTC)[reply]

2018 notes

Deleted Exoplanet (moved to January 9)
Moved to Ineligible: Romulus and Remus (maintenance)
Rescued from Ineligible (unused): Loch Ness Monster
New articles (unused): Wignacourt Aqueduct; Flint water crisis
Omitted: Laguna Copperplate Inscription; Wahhabi sack of Karbala; Bahá'u'lláh; Manfred von Richthofen (ineligible—maintenance); Century 21 Exposition; Max Weber; John Maynard Keynes; Dorothy Eady
Included: Battle of Mutina (first appearance); Henry VIII of England (10th appearance, last in 2016); Demolition of al-Baqi (first appearance); Principality of Hutt River (8th appearance, last in 2016); Kharkiv Pact (first appearance); Bajkam (first appearance); Jan Boeckhorst (first appearance); Ignatius Zakka I Iwas (first appearance)

—howcheng {chat} 02:46, 21 April 2018 (UTC)[reply]

2019 notes

Moved to Ineligible: Wahhabi sack of Karbala (maintenance); Flint water crisis (maintenance)
Omitted: Henry VIII of England; Demolition of al-Baqi; Kharkiv Pact; Bajkam; Jan Boeckhorst; Ignatius Zakka I Iwas
Included: Wignacourt Aqueduct (first appearance); Ypiranga incident (3rd appearance, last in 2016); Loch Ness Monster (5th appearance, last in 2012); Bardas (first appearance); Petrus Apianus (first appearance); Cheryl Gillan (first appearance)
Repeats: Battle of Mutina (2nd consecutive appearance, 2 total); Principality of Hutt River (2nd consecutive appearance, 10 total)

—howcheng {chat} 15:54, 22 April 2019 (UTC)[reply]

2020 notes

New articles (ineligible): George Washington's reception at Trenton (on DYK on 2020-02-22)
Omitted: Battle of Mutina; Wignacourt Aqueduct; Ypiranga incident; Loch Ness Monster; Bardas; Petrus Apianus; Cheryl Gillan
Included: Battle of San Jacinto (7th appearance, last in 2014); United Airlines Flight 736 (first appearance); Kharkiv Pact (2nd appearance, last in 2018; 10th anniversary); Anselm of Canterbury (first appearance); Simon de la Loubère (first appearance); Vivian Maier (first appearance)
Repeats: Principality of Hutt River (3rd consecutive appearance, 11 total; 50th anniversary)

—howcheng {chat} 16:24, 22 April 2020 (UTC)[reply]

Founding of Rome

@Howcheng: I solved the CN in the article Founding of Rome: may it now be inserted into the page? --LukeWiller (talk) 19:27, 21 April 2021 (UTC).[reply]

@LukeWiller: Too late for this year, but feel free to move it to the eligible section once the cascade protection is gone. Thanks! —howcheng {chat} 06:55, 22 April 2021 (UTC)[reply]

Done @Howcheng: Thanks to you... :-) --LukeWiller (talk) 17:39, 22 April 2021 (UTC).[reply]

2021 notes

Rescued from Ineligible (unused): Founding of Rome
Omitted: Battle of San Jacinto; United Airlines Flight 736; Principality of Hutt River; Kharkiv Pact; Anselm of Canterbury; Simon de la Loubère; Vivian Maier
Included: Laguna Copperplate Inscription (7th appearance, last in 2017); George Washington's reception at Trenton (first appearance); Baháʼu'lláh (6th appearance, last in 2017); Nguyễn Văn Thiệu/Battle of Xuân Lộc (NVT: 4th appearance, last in 2015; Battle: first appearance); Max Weber; (2nd appearance, last in 2017); John Maynard Keynes (2nd appearance, last in 2017; 75th anniversary); Dorothy Eady (2nd appearance, last in 2017; 40th anniversary)

—howcheng {chat} 06:52, 23 April 2021 (UTC)[reply]

2022 notes

New articles (ineligible): Gaston Defferre (maintenance)
Rescued from Ineligible (unused): Flint water crisis
Omitted: Laguna Copperplate Inscription; George Washington's reception at Trenton; Baháʼu'lláh; Nguyễn Văn Thiệu/Battle of Xuân Lộc; Max Weber; John Maynard Keynes; Dorothy Eady
Included: Founding of Rome (4th appearance, last in 2006); Henry VIII (11th appearance, last in 2018); Demolition of al-Baqi (2nd appearance, last in 2018); Century 21 Exposition (3rd appearance, last in 2017; 60th anniversary); Pope Alexander II (first appearance); Antonín Kammel (first appearance); Cheryl Gillan (2nd appearance, last in 2019; 70th birthday)

—howcheng {chat} 07:11, 22 April 2022 (UTC)[reply]