Template:Selected anniversaries/May 30

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  1423: Mathematician and astronomer Georg von Peuerbach (nonfiction) born. He will be remembered for his streamlined presentation of Ptolemaic astronomy in the Theoricae Novae Planetarum.

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  1813: Engineer, naval architect, and crime-fighter Samuel Bentham uses Pantopticon technology to locate and capture alleged supervillain Neptune Slaughter.

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  1946: Physicist Louis Slotin dies. He was fatally irradiated in a criticality incident during an experiment with the demon core at Los Alamos National Laboratory.

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  1964: Physicist and academic Leo Szilard dies. He conceived the nuclear chain reaction in 1933, and patented the idea of a nuclear reactor with Enrico Fermi.

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  1967: US Army research team uses Gnomon algorithm techniques to convert modern plowshares into ancient swords. In response, APTO field agents confiscate the weapons and revoke Army access to all Gnomon algorithm source files.

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  1971: NASA launches the Mariner 9 spacecraft. It will map 70% of the surface of Mars, and study temporal changes in the atmosphere and surface.

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  2016: Blue Green Spiral voted Picture of the Day by the citizens of New Minneapolis, Canada.

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  2017: Dennis Paulson of Mars celebrates the forty-sixth anniversary of the launch of Mariner 9.