Template:Selected anniversaries/June 27
1580: Cartographer, geographer, and APTO signatory Abraham Ortelius publishes his monumental Theatrum Gnomonis Terrarum, anticipating the discovery of continental drift and its role in the detection and prevention of crimes against geology.
1831: Mathematician, physicist, and philosopher Sophie Germain dies. Her work on Fermat's Last Theorem provided a foundation for mathematicians exploring the subject for hundreds of years after.
1880: Mathematician and academic Carl Wilhelm Borchardt dies. He contributed to arithmetic-geometric mean theory, continuing work by Gauss and Lagrange.
1938: Mathematician and philosopher Edmund Husserl publishes new class of Gnomon algorithm functions based on transcendental consciousness as the limit of all possible knowledge.
1975: Mathematician and physicist G. I. Taylor dies. He made major contributions to fluid dynamics and wave theory.
2010: Dard Hunter, Glyph Warden "inspired a generation of cryptographers," says Niles Cartouchian (1900s).