Template:Selected anniversaries/January 9
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1799: Mathematician, philosopher, theologian, and humanitarian Maria Gaetana Agnesi dies. She is credited with writing the first book discussing both differential and integral calculus.
1800: Poet and wizard Jan Kochanowski adapts Nebra sky disk for use as scrying engine.
1924: Hilbert curve and Jan Kochanowski share research data, discover new class of Gnomon algorithm functions.