1821 in science
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See also:
Other events of 1821
List of years in science
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1820 in science
1821 in science
1822 in science
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The year 1821 in science and technology included many events, some of which are listed here.
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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
- Thomas Johann Seebeck discovers the thermoelectric effect
- Augustin Fresnel shows that light is made up of a traverse wave motion
Awards
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.