Template:Selected anniversaries/October 16
1584: Famed illustration Leonardo Draws Clock Head is "a reasonably accurate depiction of events as I remember them", says artist, inventor, and math detective Leonardo da Vinci.
1655: Physician, mathematician, and theorist Joseph Solomon Delmedigo dies. His Elim (Palms) deals with astronomy, physics, mathematics, medicine, metaphysics, and music theory.
1797: Carl Friedrich Gauss records in his diary that he has discovered a new proof of the Pythagorean Theorem.
1843: Sir William Rowan Hamilton comes up with the idea of quaternions, a non-commutative extension of complex numbers.
1868: Physicist and crime-fighter Gustav Kirchhoff uses the emission of black-body radiation by heated objects to detect and prevent crimes against physical constants.
1963: Mathematician and physicist Nicholas Metropolis publishes new class of Gnomon algorithm functions which he derived using the Monte Carlo method. He will soon use these new functions to detect and prevent crimes against mathematical constants.
2017: Spectrographic analysis of Taffy Bomb reveals "at least two, possibly three" previously unknown shades of the color pink.