A solar flare on January 20, 2005 released the highest concentration of protons ever directly measuredhttps://svs.gsfc.nasa.gov/3162Luminous Phenomenon Accompanying the Cyprus Earthquake, January 20, 1941http://www.nature.com/nature/journal/v149/n3788/abs/149640c0.htmlThe 1917 Bali earthquake occurred at 23:11 UTC on 20 January.http://en.wikipedia.org/wiki/1917_Bali_earthquake
The first launch of a Zenit-3F rocket took place on 20 January 2011http://en.wikipedia.org/wiki/Zenit-3FThe Wideband Global SATCOM 4 Satellite was launched on the 20th January, 2012http://astronomy.activeboard.com/t47263246/wideband-global-satcom-4-satellite/
Edwin Eugene "Buzz" Aldrin, Jr. (born January 20, 1930) is a former American astronauthttp://astronomy.activeboard.com/t34471160/buzz-aldrin/Jerry Lynn Ross (January 20, 1948, Crown Point, Indiana) is a former NASA astronaut.http://en.wikipedia.org/wiki/Jerry_L._RossMagomed Tolboev (born 20 January 1951) was a test-pilot for the Buran space shuttle. http://en.wikipedia.org/wiki/Magomed_TolboyevDavid Morris Lee (born January 20, 1931) is an American physicisthttp://en.wikipedia.org/wiki/David_Lee_%28physicist%29André-Marie Ampère (20 January 1775 - 10 June 1836) was a French physicisthttp://en.wikipedia.org/wiki/Andr%C3%A9-Marie_Amp%C3%A8reJames Edward Pringle (born 20 January 1949) is British astrophysicist http://en.wikipedia.org/wiki/James_E._PringleNalin Chandra Wickramasinghe (born 20 January 1939) is a Sri Lankan-born British mathematicianhttp://en.wikipedia.org/wiki/Nalin_Chandra_WickramasingheAlexandre-Emile Béguyer de Chancourtois (20 January 1820 - 14 November 1886) was a French geologisthttp://en.wikipedia.org/wiki/Alexandre-%C3%89mile_B%C3%A9guyer_de_ChancourtoisThomas Stewart Baker (born 20 January 1934) is a British actor. http://astronomy.activeboard.com/t47395031/tom-baker/Jackson DeForest Kelley (January 20, 1920 - June 11, 1999) was an American actorhttp://en.wikipedia.org/wiki/DeForest_Kelley
Louis Boyer (1901 - 1999) was a French astronomer.https://en.wikipedia.org/wiki/Louis_Boyer_%28astronomer%29
Simon Marius (Latinised from German Simon Mayr; January 20, 1573 - January 5, 1625) was a German astronomer.https://en.wikipedia.org/wiki/Simon_Marius
NGC 2206 was discovered by John Herschel on the 20th January 1835. http://astronomy.activeboard.com/t56349031/ngc-2206/NGC 2217 was discovered by John Herschel on the 20th January 1835. http://astronomy.activeboard.com/t56349040/ngc-2217/NGC 2263 was discovered by John Herschel on the 20th January 1835. http://astronomy.activeboard.com/t56349048/ngc-2263/NGC 2272 was discovered by John Herschel on the 20th January 1835. http://astronomy.activeboard.com/t56349054/ngc-2272/NGC 2292 was discovered by British astronomer John Herschel on the 20th January 1835. http://astronomy.activeboard.com/t56349061/ngc-2292/NGC 2293 was discovered by British astronomer John Herschel on the 20th January 1835. http://astronomy.activeboard.com/t56349069/ngc-2293/
Cordelia the innermost known moon of Uranus was discovered by Voyager 2 on January 20, 1986https://en.wikipedia.org/wiki/Cordelia_%28moon%29
Ophelia a moon of Uranus was discovered by Voyager 2 on January 20, 1986https://en.wikipedia.org/wiki/Ophelia_%28moon%29
The Alpha Hydrids are a minor shower that peaks on January 20http://astronomy.activeboard.com/t56102118/alpha-hydrids/Huge Fireball Over Japan on 20 January 2013
MeteoritesThe Palmyra (L3) meteorite fell in Missouri, USA, on the 20th January, 1926.http://astronomy.activeboard.com/t47395292/palmyra-meteorite/The Dongtai (LL6) meteorite fell in Jiangsu, China, on the 20th January, 1970.http://astronomy.activeboard.com/t47395294/dongtai-meteorite/