1685 in science
The year 1685 in science and technology involved some significant events.
Mathematics
- Adam Adamandy Kochański publishes an approximation for squaring the circle.
Physiology and medicine
- Charles Allen publishes the first book in English on dentistry, .
- Govert Bidloo publishes an atlas of human anatomy, Ontleding des menschelyken lichaams, with plates by Gerard de Lairesse.
Technology
- Menno van Coehoorn publishes his principal treatise on fortification, Nieuwe Vestingbouw op een natte of lage horisont, in Leeuwarden.
Births
- August 18 – Brook Taylor, English mathematician
- November 17 – Pierre Gaultier de Varennes et de la Vérendrye, French Canadian explorer
Deaths
- February 2 – Pierre Bourdelot, French physician, anatomist, freethinker, abbé and libertine
- November 23 – Bernard de Gomme, military engineer in England
- December 12 – John Pell, English mathematician