Template:Selected anniversaries/September 20: Difference between revisions

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File:Petrozavodsk phenomenon photo copy.jpg|link=Petrozavodsk phenomenon (nonfiction)|1977: A series of celestial events occurs, with sightings reported over a vast territory, from Copenhagen and Helsinki in the west to Vladivostok in the east. It is commonly known as the [[Petrozavodsk phenomenon (nonfiction)|The Petrozavodsk phenomenon]] after the city of Petrozavodsk in Russia (then in the Soviet Union), where a glowing object which showered the city with numerous rays was widely reported. The nature of the phenomenon is disputed.
File:Petrozavodsk phenomenon photo copy.jpg|link=Petrozavodsk phenomenon (nonfiction)|1977: A series of celestial events occurs, with sightings reported over a vast territory, from Copenhagen and Helsinki in the west to Vladivostok in the east. It is commonly known as the [[Petrozavodsk phenomenon (nonfiction)|The Petrozavodsk phenomenon]] after the city of Petrozavodsk in Russia (then in the Soviet Union), where a glowing object which showered the city with numerous rays was widely reported. The nature of the phenomenon is disputed.


File:Alice Beta.jpg|link=Alice Beta|1989: Mathematicians [[Alice Beta]] and [[Paul Erdős (nonfiction)|Paul Erdős]] co-publish a new class of [[Gnomon algorithm functions]] which detect and prevent [[crimes against mathematical constants]].
File:Alice Beta.jpg|link=Alice Beta|1989: Mathematicians [[Alice Beta]] and [[Paul Erdős (nonfiction)|Paul Erdős]] co-publish a new class of [[Gnomon algorithm functions]] which actively facilitate collaboration between mathematicians.


File:Paul Erdős.jpg|link=Paul Erdős (nonfiction)|1996: Mathematician and academic [[Paul Erdős (nonfiction)|Paul Erdős]] dies. Erdős firmly believed mathematics to be a social activity, living an itinerant lifestyle with the sole purpose of writing mathematical papers with other mathematicians.
File:Paul Erdős.jpg|link=Paul Erdős (nonfiction)|1996: Mathematician and academic [[Paul Erdős (nonfiction)|Paul Erdős]] dies. Erdős firmly believed mathematics to be a social activity, living an itinerant lifestyle with the sole purpose of writing mathematical papers with other mathematicians.


||2000: The United Kingdom's MI6 Secret Intelligence Service building is attacked by individuals using a Russian-built RPG-22 anti-tank missile. The perpetrators remain unidentified.
||2000: The United Kingdom's MI6 Secret Intelligence Service building is attacked by individuals using a Russian-built RPG-22 anti-tank missile.  


File:Traveller.jpg|link=Traveller (nonfiction)|2016: ''[[Traveller (nonfiction)|Traveller]]'' voted Picture of the Day by the citizens of [[New Minneapolis, Canada]].
File:Traveller.jpg|link=Traveller (nonfiction)|2016: ''[[Traveller (nonfiction)|Traveller]]'' voted Picture of the Day by the citizens of [[New Minneapolis, Canada]].


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Revision as of 08:00, 20 September 2020