1807 in science

The year 1807 in science and technology involved some significant events, listed below.

Astronomy

Potassium and sodium are isolated by Sir Humphry Davy.
The use of fulminate in firearms is patented by Scottish clergyman Alexander John Forsyth.

William Wallace proves that any two simple polygons of equal area are equidecomposable, later known as the Wallace–Bolyai–Gerwien theorem.

Samuel Hahnemann first introduces the term 'homeopathy' in an essay, "Indications of the Homeopathic Employment of Medicines in Ordinary Practice", published in Versammlung der Hufelandische medicinisch-chirurgischen Gesellschaft.
British Army surgeon John Vetch describes the keratoconjunctivitis suffered by troops returned from service overseas; he identifies it as epidemic.

July 20 – French brothers Claude and Nicéphore Niépce receive a patent for their Pyréolophore, an early internal combustion engine, having demonstrated it powering a boat on the Saône.
August 17 – Robert Fulton's North River Steamboat makes her first trip from New York City to Albany.
November 19 – English inventor Lionel Lukin launches the world's first sailing self-righting rescue life-boat, the Frances Anne, at Lowestoft.
William Cubitt patents self-regulating sails for windmills.
Henry Maudslay patents an improved table engine.
William Hyde Wollaston patents the camera lucida.

Alexander von Humboldt's Le Voyage aux Régions equinoxiales du Nouveau Continent, fait en 1799–1804, par Alexandre de Humboldt et Aimé Bonpland begins publication.
Thomas Young's A Course of Lectures on Natural Philosophy and the Mechanical Arts published.