August 20, 1514 "At the hour of wu (i.e. between 11 and 13 h) the sun was eclipsed".http://astronomy.activeboard.com/t58357296/august-20-1514-solar-eclipse/An annular solar eclipse occurred on August 20, 1952.http://en.wikipedia.org/wiki/Solar_eclipse_of_August_20,_1952
World Mosquito Day is observed annually on 20 Augusthttp://en.wikipedia.org/wiki/World_Mosquito_Day
Small earthquakes around Mount Vesuvius started taking place on 20 August, 79 ADhttp://en.wikipedia.org/wiki/Mount_VesuviusThe Battle of Thermopylae was fought between an alliance of Greek city-states, and the Persian Empire of Xerxes I http://en.wikipedia.org/wiki/Battle_of_Thermopylae
Viking 1 was launched on August 20, 1975 and arrived at Mars on June 19, 1976. http://astronomy.activeboard.com/t2904191/viking-lander-1-and-mars-pathfinder/Voyager 2 was launched on August 20, 1977 to explore the planets of the outer solar systemhttp://astronomy.activeboard.com/t14396961/voyager-2-mission/Progress M-9 was launched on August 20, 1991 http://en.wikipedia.org/wiki/Progress_M-9
Jean-Loup Chrétien (born August 20, 1938) is a former CNES spationaut.http://en.wikipedia.org/wiki/Jean-Loup_Chr%C3%A9tienEduard Suess (August 20, 1831 - April 26, 1914) was a geologist http://en.wikipedia.org/wiki/Eduard_SuessJöns Jacob Berzelius (20 August 1779 - 7 August 1848) was a Swedish chemist. http://en.wikipedia.org/wiki/J%C3%B6ns_Jakob_Berzelius
Leonidas (died 20 August 480 BC) was a hero-king of Spartahttp://astronomy.activeboard.com/t44334612/leonidas/Sylvester McCoy (born Percy James Patrick Kent-Smith; 20 August 1943) is a Scottish actor. http://en.wikipedia.org/wiki/Sylvester_McCoyThomas Simpson FRS (20 August 1710 - 14 May 1761) was a British mathematicianhttp://en.wikipedia.org/wiki/Thomas_SimpsonSimon Kirwan Donaldson (born 20 August 1957, in Cambridge, England), is an English mathematicianhttp://en.wikipedia.org/wiki/Simon_Kirwan_DonaldsonVytautas Straiys (born August 20, 1936) is a Lithuanian astronomer. http://en.wikipedia.org/wiki/Vytautas_Strai%C5%BEysRichard Reinhard Emil Schorr (August 20, 1867 - September 21, 1951), was an astronomer. http://en.wikipedia.org/wiki/Richard_SchorrChristian Mayer (August 20, 1719 - April 16, 1783) was a Czech astronomer and teacher.http://en.wikipedia.org/wiki/Christian_Mayer_%28astronomer%29
Charles Darwin first published his theory of evolution through natural selection on 20 August 1858http://en.wikipedia.org/wiki/On_the_Tendency_of_Species_to_form_Varieties
NGC 2 was discovered by Irish astronomer Lawrence Parsons, 4th Earl of Rosse, on the 20th August 1873.http://astronomy.activeboard.com/t58358319/ngc-2/NGC 3809 was discovered by German astronomer Heinrich Louis d'Arrest on the 20th August 1866.http://astronomy.activeboard.com/t58358310/ngc-3809/NGC 6974 was discovered by Irish astronomer Lawrence Parsons, 4th Earl of Rosse, on the 20th August 1873.http://astronomy.activeboard.com/t58358304/ngc-6974/NGC 7047 was discovered by French astronomer Edouard Jean-Marie Stephan on the 20th August 1873. http://astronomy.activeboard.com/t58358286/ngc-7047/NGC 7304 was observed by German astronomer Heinrich Louis d'Arrest on the 20th August 1862.http://astronomy.activeboard.com/t58358274/ngc-7304/
S Andromedae (SN 1885A) was discovered by Ernst Hartwig on 20 August 1885https://en.wikipedia.org/wiki/SN_1885A
The earliest known photograph of Pluto was taken on August 20, 1909, although the astronomers at the Yerkes Observatory did not realise it.https://en.wikipedia.org/wiki/Pluto#Discovery
Asteroid (669) Kypria was discovered by German astronomer August Kopff on August 20, 1908.http://en.wikipedia.org/wiki/669_Kypria
MeteoritesThe Golden Aerolite in Idaho fell on the night of August 20, 1892http://trove.nla.gov.au/ndp/del/article/25339648The Douar Mghila (LL6) meteorite fell in Central Morocco, on the 20th August 1932.http://astronomy.activeboard.com/t44539581/douar-mghila-meteorite/The Alta'ameem (LL5) meteorite fell in At Ta'min, Iraq, on the 20th August 1977.http://astronomy.activeboard.com/t44539588/altaameem-meteorite/The Ceniceros (L3.7) meteorite fell in Durango, Mexico, on the 20th August 1988.http://astronomy.activeboard.com/t44539599/ceniceros-meteorite/