July 27
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1801 - Astronomer and mathematician Sir George Biddell Airy is born. During his life, he computed the density of the Earth, determined the mass of the planet Jupiter and its period rotation, calculated the orbits of comets, cataloged stars, and designed corrective lenses for the vision issue of astigmatism.
1929 - The Geneva Convention is held to address the treatment of prisoners of war.
2403 - Lucas Leeot is assigned as commanding officer of the USS Philadelphia, FF-6053.
