1693 in science
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- Edmond Halley publishes an article in Philosophical Transactions of the Royal Society on life annuities featuring a life table constructed on the basis of statistics from Breslau provided by Caspar Neumann.
- Publication of Charles Plumier's first work, Description des plantes de l'Amérique, in Paris, principally devoted to ferns.
- Bernard Frénicle de Bessy's Des quarrez ou tables magiques, a treatise on magic squares, is published posthumously, describing all 880 essentially different normal magic squares of order 4.
Physiology and medicine
- Flemish anatomist Philip Verheyen, in his widely used text Corporis Humani Anatomia, is the first to record the name of the Achilles tendon.
- February 18 – Elias Tillandz, Swedish physician and botanist in Finland (born 1640)
- October 4 – Sir Thomas Clayton, English physician, academic and politician (born c.1612)
- December 22 – Elisabeth Hevelius, Danzig astronomer (born 1647)