Template:Selected anniversaries/December 12
1204: Rabbi, philosopher, astronomer, and physician Maimonides dies.
1685: Mathematician John Pell dies. He expanded the scope of algebra in the theory of equations.
1705: Inventor and priest Bartolomeu de Gusmão's uses Gnomon algorithm to communicate with John Pell.
1862: USS Cairo sinks on the Yazoo River, becoming the first armored ship to be sunk by an electrically detonated mine.
![1901: Guglielmo Marconi receives the first transatlantic radio signal (the letter "S" [***] in Morse Code), at Signal Hill in St John's, Newfoundland.](/w/images/thumb/0/0d/Guglielmo_Marconi.jpg/90px-Guglielmo_Marconi.jpg)
1901: Guglielmo Marconi receives the first transatlantic radio signal (the letter "S" [***] in Morse Code), at Signal Hill in St John's, Newfoundland.
1921: Astronomer Henrietta Swan Leavitt dies. She discovered the relation between the luminosity and the period of Cepheid variable stars.
1973: Talk show host Peter Giblets films an episode of Peter Giblets Hour in New Minneapolis, Canada his guests include Niles Cartouchian and Pierre Trudeau.
1994: Diagram of public-key cryptography generation sell for 1.7 million dollars.
2016: Do Not Tease Monster declared Image of the Day by the citizens of New Minneapolis, Canada.