Template:Selected anniversaries/May 30

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

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  1739: Jacques de Vaucanson demonstrates his Digesting Duck automaton for the first time.

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