1690 in science

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The year 1690 in science and technology involved some significant events.

Astronomy

• Giovanni Cassini observes differential rotation within Jupiter's atmosphere.
• Earliest recorded sightings of the planet Uranus, by John Flamsteed, who mistakenly catalogues it as the star 34 Tauri.

Mathematics

• Izeki Tomotoki (井関 知辰) of Osaka publishes Sampo-Hakki (算法発揮), in which he gives the resultant and the Laplace formula of the determinant for the n×n case. At about this date, Tanaka Yoshizane ( 田中 由真) also describes and applies the resultant, in Sampo-Funkai (算法紛解).

Medicine

• Justine Siegemund publishes Die Kgl. Preußische und Chur-Brandenburgische Hof-Wehemutter ("The Court Midwife"), the first medical textbook in German written by a woman.

Technology

• Denis Papin, while in Leipzig and having observed the mechanical power of atmospheric pressure on his 'digester', builds a working model of a reciprocating steam engine, the first of its kind.
• America's first paper money is printed in the Massachusetts Bay Colony.

Births

• March 18 - Christian Goldbach, Prussian mathematician (d. 1764)

Deaths

• October 13 - Ole Borch, Danish polymath (b. 1626)
• October 22 (bur.) - William Ball, English astronomer (b. c.1631)