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 July 16 article, see Talk:July 16 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?
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.
The Hanford Engineer Works (HEW) was a nuclear production complex in Benton County in the US state of Washington, established in 1943 as part of the Manhattan Project during World War II. Plutonium manufactured at the HEW was used in the atomic bomb detonated in the Trinity test on 16 July 1945, and the Fat Man bomb used in the bombing of Nagasaki on 9 August 1945. DuPont was the prime contractor for its design, construction and operation. The land acquisition was one of the largest in US history. Construction commenced in March 1943, and its workforce reached a peak of nearly 45,000 workers in June 1944. B Reactor, the world's first full-scale plutonium production nuclear reactor, went critical in September 1944, followed by D and F reactors in December 1944 and February 1945 respectively. The HEW suffered an outage on 10 March 1945 due to a Japanese balloon bomb. The total cost of the HEW up to December 1946 was over $348million (equivalent to $4.1billion in 2023). (Full article...)
1914 - Hellenic Holocaust: According to the German Consul Kuchhoff: "The entire Greek population of Sinope and the coastal region of Kastanome faced death from hunger or illness." --169.207.90.219
Removing back, dispute is over on article. — Jor (Talk) 14:04, 3 Apr 2004 (UTC)