* Astronomy

A penumbral lunar eclipse took place on October 18, 2013
http://astronomy.activeboard.com/t51218090/penumbral-lunar-eclipse-october-18-2013/

Pappus of Alexandria observed an eclipse of the sun on the 18th October, 320 AD.
http://astronomy.activeboard.com/t45627555/pappus-of-alexandria-c-290-c-350/

International Necktie Day is celebrated on October 18 
http://en.wikipedia.org/wiki/Necktie#Origins

Heidelberg University was founded in 1386
http://en.wikipedia.org/wiki/University_of_Heidelberg

The University of Bonn was founded on 18th October, 1818
http://en.wikipedia.org/wiki/University_of_Bonn

The Basel earthquake of 18 October 1356 was a significant Central Europe seismological event 
http://astronomy.activeboard.com/t45627551/1356-basel-earthquake/

The 1916 Irondale earthquake struck northcentral Alabama on October 18, 1916.
http://en.wikipedia.org/wiki/1916_Irondale_earthquake

Nikolai Petrovich Kamanin (18 October 1908 - 11 March 1982) was a Soviet aviator
http://en.wikipedia.org/wiki/Nikolai_Kamanin

Salomon August Andrée (October 18, 1854 - October 1897) was a Swedish aeronaut and polar explorer
http://en.wikipedia.org/wiki/Salomon_August_Andr%C3%A9e

Stacy Allison reached the summit of Mount Everest in 1988. 
http://en.wikipedia.org/wiki/Stacy_Allison

Thomas Harriot (Oxford, ca. 1560 - London, 2 July 1621) was an English astronomer
http://en.wikipedia.org/wiki/Thomas_Harriot

Carl Clarence Kiess (October 18, 1887 - October 16, 1967) was an American astronomer
http://en.wikipedia.org/wiki/Carl_Clarence_Kiess

Ernst Pascual Jordan (18 October 1902 - 31 July 1980) was a theoretical physicist 
http://en.wikipedia.org/wiki/Pascual_Jordan

Thomas Edison's last breath is reportedly contained in a test tube at the Henry Ford Museum.
http://en.wikipedia.org/wiki/Thomas_Edison#Final_years_and_death

Subrahmanyan Chandrasekhar (October 19, 1910 - August 21, 1995) was an Indian astrophysicist
http://astronomy.activeboard.com/t38860111/subramanyan-chandrasekhar/

Florian Goebel (18 October 1972 - 10 September 2008) was a German astrophysicist
http://en.wikipedia.org/wiki/Florian_Goebel

Nicholas Culpeper (18 October 1616 - 10 January 1654) was an English botanist
http://astronomy.activeboard.com/t45627548/nicholas-culpeper-1616-1654/

NGC Discovered

NGC 243 is a magnitude +13.7 spiral galaxy discovered by Edouard Stephan on the 18th October, 1881.
http://astronomy.activeboard.com/t58800272/ngc-243/

NGC 606 was discovered on the 18th October, 1881.
http://astronomy.activeboard.com/t55283535/ngc-606/

Messier 74 was discovered by Pierre Mechain in late September 1780
Charles Messier included it in his catalogue on the 18th October 1780.
http://astronomy.activeboard.com/t14438542/messier-74/

NGC 1023 is a magnitude +10.35 barred spiral galaxy discovered by William Herschel on the 18th October 1786.
http://astronomy.activeboard.com/t21283563/ngc-1023/

NGC 7023 was discovered by William Herschel on the 18th October, 1794.
http://astronomy.activeboard.com/t5243990/ngc-7023/

NGC 7129 was discovered by William Herschel on the 18th October, 1794
http://astronomy.activeboard.com/t3794407/ngc-7129/

NGC 7385 was discovered by William Herschel on the 18th October, 1784.
http://astronomy.activeboard.com/t55283709/ngc-7385/

NGC 7386 is a magnitude +12.3 spiral galaxy discovered by William Herschel on the 18th October 1784.
http://astronomy.activeboard.com/t58800225/ngc-7386/

NGC 7426 was discovered by William Herschel on the 18th October, 1786.
http://astronomy.activeboard.com/t55283736/ngc-7426/

NGC 7648 was discovered by William Herschel on the 18th October, 1784.
http://astronomy.activeboard.com/t55283771/ngc-7648/

NGC 7742 is a magnitude +11.6 spiral galaxy discovered by William Herschel on the 18th October 1784.
http://astronomy.activeboard.com/t58800223/ngc-7742/

NGC 7743 is a magnitude +11.5 spiral galaxy discovered by William Herschel on the 18th October 1784.
http://astronomy.activeboard.com/t58800214/ngc-7743/

Tuesday 19 October 1954: Fireball Panics Sydney
http://astronomy.activeboard.com/t58799460/sydney-fireball-19-october-1954/