Template:Selected anniversaries/October 16
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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.
1843: Sir William Rowan Hamilton comes up with the idea of quaternions, a non-commutative extension of complex numbers.
2017: Quaternion multiplication table sells for six million dollars.