Template:Selected anniversaries/August 25

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  1609: Galileo Galilei demonstrates his first telescope to Venetian lawmakers.

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  1698: Physicist, mathematician, and inventor Denis Papin demonstrates new version of his steam digester which uses Gnomon algorithm principles to generate gray light and cryptographic numina.

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  1699: Mathematician and mechanician Charles Étienne Louis Camus born. He will be the author of Cours de mathématiques (Paris, 1766), along with a number of essays on mathematical and mechanical subjects.

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  1818: Mechanical soldier Clock Head receives several patents for an improvements to steam engines.

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  1819: inventor, engineer, and chemist James Watt dies. He made major improvements to the steam engine.

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  1933: Clock Head 2 publishes new class of Gnomon algorithm functions which detect and prevent crimes against mathematical constants.

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  1934: Inventor Philo Farnsworth demonstrates his electronic television system to the public at the Franklin Institute in Philadelphia.

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  2012: Voyager 1 crossed the heliopause to become the first spacecraft to enter interstellar space and study the interstellar medium.

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  2016: Polymath George Spencer-Brown dies. He wrote Laws of Form, calling it the "primary algebra" and the "calculus of indications".

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  2017: Signed first edition of The Eel Time-Surfing 2 sells for two and a half million dollars.