Template:Selected anniversaries/January 5

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  1625: Astronomer Simon Marius dies. He discovered the four largest moons of Jupiter, independently of Galileo Galilei.

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  1723: Astronomer and mathematician Nicole-Reine Lepaute born. She will predict the return of Halley's Comet, calculate the timing of a solar eclipse, and construct a group of catalogs for the stars.

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  1777: Natural scientist, explorer, and APTO chaplain Erik Laxmann establishes diplomatic relations with the Stomach Oil Exporting Petrels (SOEP).

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  1895: French army officer Alfred Dreyfus is stripped of his rank and sentenced to life imprisonment on Devil's Island.

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  1932: Novelist, literary critic, and philosopher Umberto Eco born. He will cite James Joyce and Jorge Luis Borges as the two modern authors who will have influenced his work the most.

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  1945: Mathematician Dmitry Mirimanoff dies. In 1917, he introduced (though not as explicitly as John von Neumann later) the cumulative hierarchy of sets and the notion of von Neumann ordinals; although he introduced a notion of regular (and well-founded set) he did not consider regularity as an axiom, but also explored what is now called non-well-founded set theory, and had an emergent idea of what is now called bisimulation.

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  1956: Physicist and APTO field engineer Pavel Cherenkov discovers a new class of Gnomon algorithm functions which use Cherenkov radiation to detect and prevent crimes against physical constants.

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  1970: Physicist and mathematician Max Born dies. He won the 1954 Nobel Prize in Physics for his "fundamental research in quantum mechanics, especially in the statistical interpretation of the wave function".

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  2017: Signed first edition of Two Bugs Fighting sells for an undisclosed amount to "a prominent Gnomon algorithm theorist living in New Minneapolis, Canada.