Template:Selected anniversaries/October 6

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  1570: Gerolamo Cardano imprisoned for 87 days on charges of impiety (casting a horoscope of Christ). He spent the remaining five years of his life in Rome under the eye of a suspicious pope who nonetheless gave him a pension.

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  1735: Mathematician, astronomical and scientific instrument maker Jesse Ramsden born. He will build his reputation on his engraving and design of dividing engines, which allowed high accuracy measurements of angles and lengths in instruments. Ramsden will produce instruments for astronomy that will be especially well-known for maritime use (needed for the measurement of latitudes), and for his surveying instruments (widely used for cartography and land survey).

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  1784: Mathematician, engineer, cartographer, economist, and politician Charles Dupin born. In 1826 he will create the earliest known choropleth map.

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  1785: Mathematician, philosopher, and phenomenological crime-fighter Thomas Reid publishes new theory of sensus communis) based on the belief that there is a Gnomon algorithm which accurately represents the external world. Reid's work will soon find applications in the detection and prevention of crimes against physical constants.

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  1831: Mathematician, philosopher, and academic Richard Dedekind born. He will make important contributions to abstract algebra (particularly ring theory), algebraic number theory and the definition of the real numbers.

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  1851: Mechanical soldier Clock Head co-founds the town of Periphery.

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  1866: Inventor Reginald Fessenden born. He will perform pioneering experiments in radio, including the use of continuous waves and the early—and possibly the first—radio transmissions of voice and music.

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  1880: Mathematician Benjamin Peirce dies. He made contributions to celestial mechanics, statistics, number theory, algebra, and the philosophy of mathematics; he became known for the statement that "Mathematics is the science that draws necessary conclusions".

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  1889: American inventor Thomas Edison shows his first motion picture.

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  1902: "Fightin'" Bert Russell agrees to fight three rounds of bare-knuckled boxing at World Peace Conference.

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  1967: Mathematician, academic, and APTO matrix security specialist Olga Taussky-Todd discovers new class of Gnomon algorithm functions which use the computational stability of complex matrices to detect and prevent crimes against mathematical constants.

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  2017: Violet Spiral voted Picture of the Day by the citizens of New Minneapolis, Canada.