Template:Selected anniversaries/September 18

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  1751: Mathematician, astronomer, and crime-fighter Pieter van Musschenbroek uses a grid of Leyden jars to detect and prevent crimes against mathematical constants.

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  1783: Mathematician and physicist Leonhard Euler dies. He made important and influential discoveries in many branches of mathematics, and introduced much of the modern mathematical terminology and notation, such as the notion of a mathematical function.

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  1888: Poet and wizard Jan Kochanowski adapts Nebra sky disk for use as scrying engine.

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  1967: Physicist, academic, and Nobel Prize laureate John Cockcroft dies. He was instrumental in the development of nuclear power.

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  1977: Voyager 1 takes first photograph of the Earth and the Moon together.

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  1993: "Hello World" computer program learning scrying engine techniques from poet and wizard Jan Kochanowski.

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  2017: The Custodian tells a funny story about why you can't go in there.