1735 in science

• July 11 - Pluto (not known at this time) enters a fourteen-year period inside the orbit of Neptune, which will not recur until 1979. ==Biology==

• Carl Linnaeus publishes the first edition of his Systema Naturæ in Leiden. ==Chemistry==

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

• May – French Geodesic Mission (including Charles Marie de La Condamine, Pierre Bouguer, Louis Godin, Jorge Juan, Antonio de Ulloa, Joseph de Jussieu and Jean Godin) 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. ==Physiology and medicine==

• December 6 – The second successful appendectomy is performed by naturalised British surgeon Claudius Aymand at St George's Hospital in London (the first was in 1731). ==Births==

• April 21 – Ivan Petrovich Kulibin, Russian inventor (died 1818) • May 17 (bapt.) – John Brown, Scottish physician (died 1788) • August 7 – Claudine Picardet, French, chemist, mineralogist, meteorologist and scientific translator (died 1820) • September 6 – John Joseph Merlin, Liégeois-born inventor (died 1803) • October 6 – Jesse Ramsden, English scientific instrument maker (died 1800) • December 4 – Josephus Nicolaus Laurenti, Viennese herpetologist (died 1805) ==Deaths==

• February 27 – Dr John Arbuthnot, British polymath (born 1667) • September 27 – Peter Artedi, Swedish naturalist (born 1705) ==References==