Template:Selected anniversaries/January 23

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  1656: Blaise Pascal publishes the first of his Lettres provinciales.

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  1805: Inventor Claude Chappe dies. He invented and developed a practical semaphore system that eventually spanned all of France -- the first practical telecommunications system of the industrial age.

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  1854: Mathematician Leopold Kronecker discovers new family of Gnomon algorithm functions.

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  1862: Mathematician David Hilbert born. he will discover and develop a broad range of fundamental ideas in many areas, including invariant theory and the axiomatization of geometry.

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  1941: Charles Lindbergh testifies before the U.S. Congress and recommends that the United States negotiate a neutrality pact with Adolf Hitler.

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  1967: John Brunner uses scrying engine to detect and expose crimes against mathematical constants.

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  2003: A very weak signal from Pioneer 10 is detected for the last time; no usable data can be extracted.

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  2007: CIA officer and author E. Howard Hunt dies. Along with G. Gordon Liddy, Hunt plotted the Watergate burglaries and other undercover operations for the Nixon administration.