1790 in science

The year 1790 in science and technology involved some significant events.

Astronomy

• Armagh Observatory, founded in Ireland by Richard Robinson, 1st Baron Rokeby, Archbishop of Armagh, begins to function.
• Johann Tobias Lowitz observes a complex halo display in St. Petersburg.<ref>Template:Cite web (Description of a remarkable atmospheric phenomenon, observed at St. Petersburg on June 18, 1790), pages 384-388</ref>

Biology

• English ornithologist John Latham publishes his Index Ornithologicus, including a scientific description of the black swan.
• English botanical illustrator James Sowerby begins publication of his English Botany, with text by James E. Smith.
• Goethe publishes Metamorphosis of Plants.

Chemistry

• July 31 – Samuel Hopkins of Vermont is granted a patent for a potash production technique, the first issued under the 1st United States Congress's Patent Act of 1790.<ref>Template:Cite web</ref>
• Publication in Montpellier of Jean-Antoine Chaptal's Élémens de chimie, in which he coins the word nitrogen (nitrogène).
• Adair Crawford, working with William Cruickshank, proposes the existence of the alkaline earth metal located near Strontian in Scotland which will later be isolated at strontium.<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref>

Physiology and medicine

• First recorded case of artificial insemination when British surgeon John Hunter helps impregnate a linen draper's wife.<ref>Template:Cite web</ref><ref>Template:Cite journal</ref>

Technology

• January 30 – Henry Greathead's Original rescue life-boat is tested on the River Tyne in England.<ref name="Pocket On This Day">Template:Cite book</ref>

Awards

• Copley Medal: Not awarded<ref>Template:Cite web</ref>

Births

• February 3 – Gideon Mantell, English paleontologist (died 1852)
• March 12 – John Frederic Daniell, English chemist and physicist (died 1845)
• May 23 – Jules Dumont d'Urville, French explorer (died 1842)
• May 30 – John Herapath, English physicist (died 1868)
• July 4 – George Everest, Welsh surveyor and geographer (died 1866)
• October 25 – Robert Stirling, Scottish inventor (died 1878)
• November 17 – August Ferdinand Möbius, German mathematician (died 1868)
• December 9 – Friederike Lienig, Latvian entomologist (d. 1855)
• December 19 – William Edward Parry, English Arctic explorer (died 1855)

Deaths

• February 5 – William Cullen, Scottish physician and chemist (born 1710)<ref>Template:Cite web</ref>
• March 22 – Anthony Addington, English physician (born 1713)
• April 17 – Benjamin Franklin, American statesman and polymath, known for his experiments with electricity (born 1706)
• July 17 – Johann II Bernoulli, Swiss mathematician (born 1710)