1821 in science
The year 1821 in science and technology included many events, some of which are listed here.
Astronomy Comet Encke is the second comet to be discovered to have a periodic orbit, after Comet Halley Alexis Bouvard detects irregularities in the orbit of Uranus
Exploration William Edward Parry starts his second voyage to find the Northwest Passage
Geology Ignatz Venetz proposes his ice age theory Pierre Berthier discovers bauxite Mary Anning finds the first ever plesiosaur fossil at Lyme Regis
Mathematics Augustin Louis Cauchy gives the first complete presentation of calculus using limits
Paleontology William Buckland finds the remains of a hyenas' den in Yorkshire, containing the bones of lions, elephants and rhinoceros
Physics Michael Faraday discovers electromagnetic rotation T. J. Seebeck discovers the thermoelectric effect Augustin Fresnel shows that light is made up of a traverse wave motion
Awards Copley Medal: Edward Sabine; John Herschel
Births May 16 - Pafnuty Chebyshev (d. 1894), mathematician. August 16 - Arthur Cayley (d. 1895), mathematician. August 31 - Hermann von Helmholtz (d. 1894), physicist. October 13 - Rudolf Virchow (d. 1902), biologist. November 18 - Franz Bronnow (d. 1891), astronomer.
Deaths April 20 - Franz Karl Achard (b. 1753), chemist.
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