1845 in science

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The year 1845 in science and technology involved some significant events, listed below.

Events

• January 14 – Physikalische Gesellschaft zu Berlin established and begins publishing Fortschritte der Physik and Verhandlungen.
• August 28 – The journal Scientific American begins publication.
• Alexander von Humboldt's Kosmos: Entwurf einer physischen Weltbeschreibung begins publication.

Astronomy

• April – Lord Rosse discovers that the nebula M51 has a spiral structure.
• September–October – Cornish mathematician John Couch Adams communicates to James Challis and George Biddell Airy his calculations demonstrating that a body (Neptune) is perturbing the orbit of Uranus.
• November 10 – Urbain Le Verrier presents to the Académie des sciences in Paris a memoir showing that existing theories fail to account for the motion of Uranus.
• Construction begins in Ireland of the "Leviathan of Parsonstown", a telescope built by Lord Rosse.

Biology

• August–September – Previously unknown Potato blight strikes the potato crop in Ireland: start of the Irish Potato Famine.

Chemistry

• March 17 – Stephen Perry patents the rubber band in England.
• Edmond Frémy discovers the oxidizing agent Frémy's salt.

Exploration

• August – John Franklin's expedition with HMS Erebus and HMS Terror to find the Northwest Passage is last seen entering Baffin Bay prior to its mysterious disappearance.

Medicine

• December 27 – Anesthesia is used in childbirth for the first time, by Dr Crawford Long in Jefferson, Georgia.

Physics

• September 13 – Michael Faraday discovers that an intense magnetic field can rotate the plane of polarized light.
• C. H. D. Buys Ballot confirms the Doppler effect for sound waves.

Transport

• July 26–August 10 – Isambard Kingdom Brunel’s iron steamship Great Britain makes the Transatlantic Crossing from Liverpool to New York, the first screw propelled vessel to make the passage.

Awards

• Copley Medal: Theodor Schwann
• Wollaston Medal for Geology: John Phillips

Births

• March 1 – Vasily Dokuchaev (died 1902), Russian geologist.
• March 3 – Georg Cantor (died 1918), Russian-born German mathematician.
• March 27 – Wilhelm Röntgen (died 1923), German physicist, discoverer of X-rays, Nobel laureate.
• April 21 – William Healey Dall (died 1927), American malacologist and explorer.
• May 4 – William Kingdon Clifford (died 1879), English geometer.
• May 16 – Élie Metchnikoff (died 1916), Russian-born microbiologist, Nobel laureate.
• June 16 – Heinrich Dressel (died 1920), German archaeologist.
• July 4 – Thomas Barnardo (died 1905), Irish-born physician and philanthropist.
• September 11 – Émile Baudot (died 1903), telegraph engineer.
• November 14 – Ulisse Dini (died 1918), Italian mathematician.

Deaths

• March 13 – John Frederic Daniell (born 1790), English chemist and physicist.
• March 18 – 'Johnny Appleseed' (John Chapman) (born 1774), American nurseryman.
• April 10 – Thomas Sewall (born 1786), American anatomist.
• October 18 – Dominique, comte de Cassini (born 1748), French astronomer.
• Jean Henri Jaume Saint-Hilaire (born 1772), French botanist.