While studying photographs taken in January, Clyde Tombaugh discovers Pluto, making it by far the first known object in the Kuiper belt. It was immediately hailed as the ninth planet.
However, its planetary status was questioned when it was found to be much smaller than expected. In 2006, the International Astronomical Union (IAU) formally redefined the term planet to exclude dwarf planets such as Pluto.
This unique self-portrait, also known as “view from the left eye”, is the creation of Austrian physicist and philosopher Ernst Mach (famous for his work on supersonic fluid mechanics), who was born #onthisday in 1838. Read more about the image here: https://buff.ly/38AEKc5#OTD
Italian composer Giacomo Puccini's Madama Butterfly premiered at La Scala in Milan to poor reviews, forcing him to revise the opera.
This was due in part to a late completion by Puccini, which gave inadequate time for rehearsals. Puccini revised the opera, splitting the second act in two, with the Humming Chorus as a bridge to what became Act III, and making other changes.
French anarchist Martial Bourdin accidentally kills himself while attempting to plant a bomb at the Royal Observatory, Greenwich, a fictionalised version of which appears in Joseph Conrad's novel The Secret Agent (1907). Bourdin's motives remain a mystery as does his intended target, which may have been the Greenwich Observatory.
On this day in 1920, the Negro National League was formed.
"Baseball gave you a sense of belonging. The umpire ain’t white. It’s a black umpire. The owner ain’t white. Nobody’s white. This is our thing … and we have our everything – until integration, and then we don’t have our nothing."
Happy Birthday to Henry Lawrence Garfield aka Henry Rollins, American singer of State of Alert, Black Flag and the Rollins Band, born on this day in 1961, Washington DC
#OnThisDay, 12 Feb 1983, around 200 to 300 women protested the Law of Evidence in Lahore. The law effectively made women’s testimonies worth half that of men’s.
The police used tear-gas and batons before arresting 50 of the protestors. The day is now Pakistan's Women's Day.
American mathematician and aerospace engineer Mary Jackson died #OTD in 2005.
She worked at Langley Research Center in Hampton, Virginia, for most of her career. She started as a computer engineer at the segregated West Area Computing division in 1951. In 1958, after taking engineering classes, she became NASA's first black female engineer.
German physicist Wilhelm Conrad Röntgen died #OTD in 1923.
On 8 November 1895, he produced and detected electromagnetic radiation in a wavelength range known as X-rays or Röntgen rays, an achievement that earned him the inaugural Nobel Prize in Physics in 1901. The non-SI unit of radiation exposure, the roentgen (R), is also named after him.
#OtD 8 Feb 1915 DW Griffith’s film The Birth of a Nation premiered. The first major blockbuster in the US, it glorified the KKK & portrayed Black people in the worst ways possible. It inspired a resurgence in KKK membership and still has an impact today. https://stories.workingclasshistory.com/article/10784/the-birth-of-a-nation
Dutch-Swiss mathematician and physicist Daniel Bernoulli was born #OTD in 1700.
He is particularly remembered for his applications of mathematics to mechanics, especially fluid mechanics, and for his pioneering work in probability and statistics. His name is commemorated in the Bernoulli's principle, a particular example of the conservation of energy.
Finnish priest, lyric and epic poet Johan Ludvig Runeberg was born #OTD in 1804 (Runeberg Day).
He is the author of the lyrics to Vårt land (Our Land, Maamme in Finnish) which became the Finnish national anthem. Runeberg was also involved in the modernization of the Finnish Lutheran hymnal and produced many texts for the new edition.
#OtD 1 Feb 1967, bagel bakery bosses in New York City locked out their unionised & well-organised bakers, who had been resisting 40% pay cuts, citing competition from non-union bakeries and bagels made by machines. The bakers were ultimately unsuccessful https://stories.workingclasshistory.com/article/8061/bagel-bakers-locked-out
#OtD 31 Jan 1971 anti-fascists attacked the National Socialist Party HQ in Melbourne, Australia. The Nazis, dressed like storm troopers, were advised by police to lock themselves inside, but over 500 people forced their way through and wrecked the offices https://stories.workingclasshistory.com/article/11141/melbourne-nazis-attacked
Jules Verne's novel Five Weeks in a Balloon, or, Journeys and Discoveries in Africa by Three Englishmen (Cinq semaines en ballon) is published in Paris. It will be the first of Verne's Voyages Extraordinaires. This was Verne's first novel to be published by Pierre-Jules Hetzel, following the rejection of Voyage en Angleterre et en Écosse.