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