Template:Selected anniversaries/January 9

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  Poet and wizard Jan Kochanowski adapts Nebra sky disk for use as scrying engine.

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  1924: Hilbert curve and Jan Kochanowski share research data, discover new class of Gnomon algorithm functions.

1793 – Jean-Pierre Blanchard becomes the first person to fly in a balloon in the United States.

1816 – Sir Humphry Davy tests his safety lamp for miners at Hebburn Colliery.

1839 – The French Academy of Sciences announces the Daguerreotype photography process.

1894 – New England Telephone and Telegraph installs the first battery-operated telephone switchboard in Lexington, Massachusetts.

1923 – Juan de la Cierva makes the first autogyro flight.

1864 – Vladimir Steklov, Russian mathematician and physicist (d. 1926)

1916 – Peter Twinn, English mathematician and entomologist (d. 2004)

1757 – Louis Bertrand Castel, French mathematician and philosopher (b. 1688)

1799 – Maria Gaetana Agnesi, Italian mathematician and philosopher (b. 1718)

1918 – Charles-Émile Reynaud, French scientist and educator, invented the Praxinoscope (b. 1844)