Template:Selected anniversaries/January 19
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1618: Johannes Kepler uses Gnomon algorithm functions to prevent crimes against laws of planetary motion.
1883: Mathematician Alfred Clebsch born. He will make important contributions to algebraic geometry and invariant theory.
1959: Carnivorous dirigibles weaponized, defense industry predicts numerous applications.
1964: Chronography of 354 spends tenth week on New York Times Bestseller list.
1979: Army research laboratories convert modern plowshares into ancient swords. Military contractors call technique "Astonishing breakthrough."
2004: Gilgamesh tablet grumpy about missing sections, demands high-energy literature therapy.