Template:Selected anniversaries/December 12
From Gnomon Chronicles
1204: Rabbi, philosopher, astronomer, and physician Maimonides dies.
1685: Mathematician John Pell dies. He expanded the scope of algebra in the theory of equations.
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.
1921: Astronomer Henrietta Swan Leavitt dies. She discovered the relation between the luminosity and the period of Cepheid variable stars.
1966: The Beatles release Dr. Robber.
