On November 20. 1871, some peculiar phenomena were observed on Plato at sunrisehttp://adsabs.harvard.edu/full/1872AReg...10...27.
Lake Peigneur sinkhole disaster on November 20, 1980http://astronomy.activeboard.com/t46290321/lake-peigneur/
The Essex was an American whaleship from Nantucket, Massachusetts. http://astronomy.activeboard.com/t46290316/whaleship-essex/
The Voyager 1 primary mission ended on November 20, 1980http://en.wikipedia.org/wiki/Pale_Blue_Dot
The first suborbital Rokot test launch succeeded on 20 November 1990 at the Baikonur Cosmodrome.http://en.wikipedia.org/wiki/RokotThe Zarya module was launched on November 20, 1998http://astronomy.activeboard.com/t46290327/the-zarya-module/
The first flight of the Boeing Delta IV family of rockets on 20 November 2002https://en.wikipedia.org/wiki/Common_Booster_Core
The Swift Gamma-Ray Burst Mission was launched into orbit on November 20, 2004http://en.wikipedia.org/wiki/Swift_Gamma-Ray_Burst_Mission
The Day After is a 1983 American television film that aired on November 20, 1983http://en.wikipedia.org/wiki/The_Day_After
People
James Patrick "Mash" Dutton, Jr. (born November 20, 1968) is a NASA astronauthttps://en.wikipedia.org/wiki/James_Dutton_(astronaut)
William Weber Coblentz (November 20, 1873 - September 15, 1962) was an American physicisthttp://en.wikipedia.org/wiki/William_Coblentz
Terry Lovejoy (born 20 November 1966) is an amateur astronomerhttps://en.wikipedia.org/wiki/Terry_LovejoyEdwin Powell Hubble (November 20, 1889 - September 28, 1953) was an American astronomerhttp://astronomy.activeboard.com/t21262829/edwin-hubble/Benoît B. Mandelbrot (20 November 1924 - 14 October 2010) was a French American mathematician.http://astronomy.activeboard.com/t38806146/benot-mandelbrot/Willem Jacob van Stockum (November 20, 1910 - June 10, 1944) was a mathematicianhttp://en.wikipedia.org/wiki/Willem_Jacob_van_StockumSir William Timothy Gowers, FRS (born 20 November 1963) is a British mathematician.http://en.wikipedia.org/wiki/William_Timothy_Gowers
NGC Discovered
NGC 150 was discovered by Lewis A. Swift on the 20th November 1886.http://astronomy.activeboard.com/t55635599/ngc-150/NGC 1744 was discovered by John Herschel on the 20th November 1835.http://astronomy.activeboard.com/t55635494/ngc-1744/NGC 2196 was discovered by William Herschel on the 20th November 1784.http://astronomy.activeboard.com/t55635310/ngc-2196/NGC 2482 was discovered by William Herschel on the 20th November 1784. http://astronomy.activeboard.com/t55635843/ngc-2482/NGC 2613 was discovered by William Herschel on the 20th November 1784.http://astronomy.activeboard.com/t55635221/ngc-2613/
Comet D/1884 O1 (Barnard 1) was last seen on November 20, 1884.http://en.wikipedia.org/wiki/177P/Barnard
MeteoritesThe Mauerkirchen (L6) meteorite fell in Oberosterreich, Austria, on the 20th November, 1768.http://astronomy.activeboard.com/t46290313/mauerkirchen-meteorite/The Rakovka (L6) meteorite fell in Orlovskaya oblast', Russia, on the 20th November, 1878.http://astronomy.activeboard.com/t46290315/rakovka-meteorite/The Malvern (Eucrite) meteorite fell in Free State, South Africa, on the 20th November, 1933.http://astronomy.activeboard.com/t46290333/malvern-meteorite/The Raghunathpura (Iron) meteorite fell in Rajasthan, India, on the 20th November, 1986.http://astronomy.activeboard.com/t46290346/raghunathpura-meteorite/The Buzzard Coulee (H4) meteorite fell in Saskatchewan, Canada, on the 20th November, 2008.http://astronomy.activeboard.com/t22559124/alberta-fireball/