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.
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.