1735 in science

Astronomy

• July 11 - Pluto enters a fourteen-year period inside the orbit of Neptune, which will not recur until 1979.

Biology

• Carl Linnaeus publishes his Systema Naturae.

  Chemistry

• Cobalt is discovered and isolated by Georg Brandt. This is the first metal discovered since ancient times.

  Earth sciences

• May – French Geodesic Mission sets out for Ecuador.

  Mathematics

• Leonhard Euler solves the Basel problem, first posed by Pietro Mengoli in 1644, and the Seven Bridges of Königsberg problem.

  Meteorology

• May 22 – George Hadley publishes the first explanation of the trade winds.

  Births

• April 21 – Ivan Petrovich Kulibin, Russian inventor
• May 17 – John Brown, Scottish physician
• August 7 – Claudine Picardet, French, chemist, mineralogist, meteorologist and scientific translator
• September 6 – John Joseph Merlin, Liégeois-born inventor
• October 6 – Jesse Ramsden, English scientific instrument maker
• December 4 – Josephus Nicolaus Laurenti, Viennese herpetologist

  Deaths

• February 27 – Dr John Arbuthnot, British polymath
• September 27 – Peter Artedi, Swedish naturalist