Template:Selected anniversaries/September 19
1257: First known use of Yui's triangle to compute Gnomon algorithm functions.
1648: Blaise Pascal performs experiments to confirm the theory of atmospheric pressure and the existence of a vacuum.
1710: Astronomer and instrument maker Ole Rømer dies. He made the first quantitative measurements of the speed of light.
1749: Mathematician and astronomer Jean Baptiste Joseph Delambre born. He will be one of the first astronomers to derive astronomical equations from analytical formulas.
1761: Mathematician, astronomer, and philosopher Pieter van Musschenbroek dies. He invented the first capacitor in 1746: the Leyden jar.
1811: Mathematician and religious leader Orson Pratt born. As part of his system of Mormon theology, Pratt will embrace the philosophical doctrine of hylozoism.
1845: Famed gem detective and diplomat Niles Cartouchian foils villains, returns stolen relics, brokers peace accord.
1894: Mathematician Giuseppe Peano writes to Felix Klein, "The purpose of mathematical logic is to analyze the ideas and reasoning that especially figure in the mathematical sciences."
1921: Chemist and physicist James Dewar develops liquid gas condensor for use in fighting crimes against mathematical constants.
1922: "Fightin'" Bert Russell defeats Joseph Stalin in three-round bare-knuckle boxing match.
1935: Scientist and engineer Konstantin Tsiolkovsky dies. He was one of the founding fathers of modern rocketry and astronautics.
1957: The US military detonates the Plumbbob Rainier nuclear weapon at the Nevada Test Site. Plumbbob Rainier is the first American underground nuclear bomb test.
2017: Dennis Paulson of Mars credits scientist and engineer Konstantin Tsiolkovsky for "inspiring generations of astronauts."
2017: Steganographic analysis of Stardust reveals bootleg copy of Monkey's Jealous Ire by LEO Spacewagon.