1820 in various calendars
Gregorian calendar 1820
Ab urbe condita 2573
Armenian calendar 1269
Assyrian calendar 6570
Balinese saka calendar 1741–1742
Bengali calendar 1227
Berber calendar 2770
British Regnal year 60 Geo. 3 – 1 Geo. 4
Buddhist calendar 2364
Burmese calendar 1182
Byzantine calendar 7328–7329
Chinese calendar 己卯(Earth Rabbit)
4516 or 4456
    — to —
庚辰年 (Metal Dragon)
4517 or 4457
Coptic calendar 1536–1537
Discordian calendar 2986
Ethiopian calendar 1812–1813
Hebrew calendar 5580–5581
Hindu calendars
 - Vikram Samvat 1876–1877
 - Shaka Samvat 1741–1742
 - Kali Yuga 4920–4921
Holocene calendar 11820
Igbo calendar 820–821
Iranian calendar 1198–1199
Islamic calendar 1235–1236
Japanese calendar Bunsei 3
Javanese calendar 1747–1748
Julian calendar Gregorian minus 12 days
Korean calendar 4153
Minguo calendar 92 before ROC
Nanakshahi calendar 352
Thai solar calendar 2362–2363
Tibetan calendar 阴土兔年
(female Earth-Rabbit)
1946 or 1565 or 793
    — to —
(male Iron-Dragon)
1947 or 1566 or 794
February 6: Capture of Valdivia

1820 (MDCCCXX) was a leap year starting on Saturday of the Gregorian calendar and a leap year starting on Thursday of the Julian calendar, the 1820th year of the Common Era (CE) and Anno Domini (AD) designations, the 820th year of the 2nd millennium, the 20th year of the 19th century, and the 1st year of the 1820s decade. As of the start of 1820, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.



February 23: Cato Street Conspiracy


  • April – Hans Christian Ørsted discovers the relationship between electricity and magnetism.
  • April 1 – A proclamation, signed "By order of the Committee of Organisation for forming a Provisional Government", begins the "Radical War" in Scotland.
  • April 8 – The statue of the Venus de Milo (Aphrodite of Milos, c.150 BC-125 BC) is discovered on the Greek island of Milos, by a peasant named Yorgos Kentrotas.
  • April 12 – Alexander Ypsilantis is declared leader of Filiki Eteria, a secret organization to overthrow Ottoman rule over Greece.
  • April 15 – King William I of Württemberg marries his cousin, Pauline Therese, in Stuttgart.
  • May 1 – The last hanging, drawing and quartering in Britain is meted out to the Cato Street conspirators for treason (only hanged and beheaded).
  • May 11 – HMS Beagle (the ship that will later take young Charles Darwin on his scientific voyage) is launched at Woolwich Dockyard.
  • May 20 – John Stuart Mill sets out on his formative boyhood trip to France.
  • June 5 – Caroline of Brunswick, the estranged wife of King George IV of the United Kingdom, returns to England after six years abroad in Italy, where she had been carrying on an affair; since ascending the throne in January, the King has sought to receive his government's approval for a divorce.[3]
  • June 10 – Sir Thomas Munro is appointed as the British colonial Governor of the Madras Presidency, which encompasses most of southern India.[4]
  • June 12 – Élie Decazes, leader of the opposition in France's Chamber of Deputies, successfully introduces the "Law of the Double Vote", a proposal to add to the 258 existing legislators by creating 172 seats that would be "selected by special electoral colleges" made up of the wealthiest 25% of voters in each of France's departments.[5]
  • June 12 – Delegates in St. Louis, Missouri Territory approve a proposed state constitution, proclaiming that they "do mutually agree to form and establish a free and independent republic, by the name of "The State of Missouri".[6]
  • June 29 – The cause of action that will lead to the U.S. Supreme Court case known simply as The Antelope arises, when a U.S. Treasury cutter captures a ship of the same name, which is transporting 281 Africans who had been captured as slaves, in violation of the 1819 U.S. law prohibiting the slave trade.[7]



Date unknown




Date unknown



King George III



  1. ^ a b Jones, A. G. E. (1982). Antarctica Observed: who discovered the Antarctic Continent?. Caedmon of Whitby. ISBN 0-905355-25-3.
  2. ^ a b "Fires, Great", in The Insurance Cyclopeadia: Being an Historical Treasury of Events and Circumstances Connected with the Origin and Progress of Insurance, Cornelius Walford, ed. (C. and E. Layton, 1876) pp69
  3. ^ Christopher Hibbert, Wellington: A Personal History (Da Capo Press, 1999) p220
  4. ^ T. H. Beaglehole, Thomas Munro and the Development of Administrative Policy in Madras 1792-1818 (Cambridge University Press, 22010) p121
  5. ^ Munro Price, The Perilous Crown: France Between Revolutions, 1814-1848 (Pan Macmillan, 2010) p108
  6. ^ "Missouri", in Constitutional Documents of the United States of America 1776-1860", ed. by Horst Dippel (K. G. Saur, 2007) p221
  7. ^ "Antelope Case", by John T. Noonan, Jr., in Dictionary of Afro-American Slavery, (Greenwood, 1997) p66
  8. ^ Drewry, Charles Stewart (1832). "Section III". A Memoir of Suspension Bridges: Comprising The History Of Their Origin And Progress. London: Longman, Rees, Orme, Brown, Green & Longman. pp. 37–41. Retrieved August 16, 2011.
  9. ^ Lefgren, J. C. (October 2002). "Oh, How Lovely Was the Morning: Sun 26 Mar 1820?". Meridian Magazine. (available at http://www.johnpratt.com/items/docs/lds/meridian/2002/vision.html)
  10. ^ "Anne Brontë | British author". Encyclopedia Britannica. Retrieved April 17, 2019.
  11. ^ Baly, Monica E.; Matthew, H. C. G. (2004). "Nightingale, Florence (1820–1910), reformer of Army Medical Services and of nursing organization". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/35241. ISBN 9780198614128. Retrieved April 17, 2019. (Subscription or UK public library membership required.)

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