1809 in science

The year 1809 in science and technology involved some significant events, listed below.

AstronomyEdit

Carl Friedrich Gauss publishes {{#invoke:Lang|lang}} in Hamburg, introducing the Gaussian gravitational constant and containing an influential treatment of the least squares method.<ref name=tt>Template:Cite book</ref>
S. D. Poisson publishes {{#invoke:Lang|lang}} and {{#invoke:Lang|lang}} in the Journal of the École Polytechnique, extending Lagrange's theory of planetary orbits.

William Maclure publishes the first geological map of the United States with accompanying memoir.<ref name=tt/><ref>Template:Cite journal</ref>

December 25 – American physician Ephraim McDowell performs the world's first ovariotomy, the removal of an ovarian tumor.<ref>Template:Cite journal</ref>
Philippe Pinel publishes accounts of what would later be regarded as schizophrenia.<ref>Template:Cite journal</ref>

February 11 – Robert Fulton patents the steamboat in the United States.<ref>{{#invoke:citation/CS1|citation

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May 5 – Mary Kies becomes one of the first women granted a U.S. patent, for a technique of weaving straw hats with silk and thread.<ref>{{#invoke:citation/CS1|citation

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January 4 – Louis Braille (died 1852), French inventor.
January 6 – Marie Durocher (died 1893), Brazilian physician.
February 12 – Charles Darwin (died 1882), English naturalist.
February 15 – Cyrus McCormick (died 1884), American inventor.
February 21 – Carl Ernst Bock (died 1874), German physician and anatomist.
April 7 – James Glaisher (died 1903), English meteorologist and balloonist.
April 15 – Hermann Grassmann (died 1877), German mathematician.
April 20 – James David Forbes (died 1868), Scottish physicist, glaciologist and seismologist.
August 29 – Oliver Wendell Holmes Sr. (died 1894), American physician and writer.
November 22 – Bénédict Morel (died 1873), French psychiatrist.
Date unknown – William Lobb (died 1864), English plant collector.