Template:Selected anniversaries/December 12
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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.
1994: Diagram of public-key cryptography generation sell for 1.7 million dollars.
2007: Poet and wizard Jan Kochanowski adapts Nebra sky disk for use as scrying engine.