Editing 1820 in science (section)

==Astronomy==
*  March 10 – [[Royal Astronomical Society|Astronomical Society of London]] is founded.<ref>{{cite web|title=A brief history of the RAS|url=http://www.ras.org.uk/about-the-ras/a-brief-history|publisher=Royal Astronomical Society|accessdate=2011-08-16}}</ref>
* October 20 – [[Royal Observatory, Cape of Good Hope]], is founded.<ref>{{cite book|title=A History of Scientific Endeavour in South Africa: A Collection of Essays Published on the Occasion of the Centenary of the Royal Society of South Africa|editor1-last=Brown|editor1-first=Alexander Claude|publisher=Royal Society of South Africa|year=1977|location=Cape Town|author=Royal Society of South Africa|url=https://books.google.com/books?id=-X4IAAAAMAAJ&q=founded+1820|page=60}}</ref>