* Astronomy

The 1980 Irpinia earthquake took place in the Irpinia region in Southern Italy on November 23.
https://en.wikipedia.org/wiki/1980_Irpinia_earthquake

The New Mexico Museum of Space History was opening to the public on November 23, 1976
http://en.wikipedia.org/wiki/New_Mexico_Museum_of_Space_History

People

Vladislav Nikolayevich Volkov (November 23, 1935 - June 30, 1971) was a Soviet cosmonaut 
http://astronomy.activeboard.com/t46352107/vladislav-nikolayevich-volkov-1935-1971/

Elizabeth Scott (November 23, 1917 - December 20, 1988) was an American mathematician
http://en.wikipedia.org/wiki/Elizabeth_Scott_(mathematician)

John Wallis (23 November 1616 - 28 October 1703) was an English mathematician
http://astronomy.activeboard.com/t46352158/john-wallis-1616-1703/

Henry Gwyn Jeffreys Moseley (23 November 1887 - 10 August 1915) was an English physicist
http://astronomy.activeboard.com/t46352115/henry-gwyn-jeffreys-moseley-1887-1915/

Johannes Diderik van der Waals (November 23, 1837 - March 8, 1923) was a Dutch theoretical physicist 
http://astronomy.activeboard.com/t46352124/johannes-diderik-van-der-waals-1837-1923/

Alfonso X (23 November 1221 - 4 April 1284) was a Castilian monarch
http://astronomy.activeboard.com/t46352136/alfonso-x-1221-1284/

Thespis of Icaria (6th century BC) was the first person ever to appear on stage as an actor playing a character in a play 
http://en.wikipedia.org/wiki/Thespis

Antoine Darquier de Pellepoix (23 November 1718 - 18 January 1802) was a French astronomer.
https://en.wikipedia.org/wiki/Antoine_Darquier_de_Pellepoix

Francis Wollaston (23 November 1731, London - 31 October 1815) was an English priest and astronomer. 
http://en.wikipedia.org/wiki/Francis_Wollaston_(astronomer)

Pierre Charles Le Monnier (23 November 1715 - 31 May 1799) was a French astronomer.
http://en.wikipedia.org/wiki/Pierre_Charles_Le_Monnier

NGC Discovered

NGC 1132 was discovered by John Herschel on the 23rd November 1827.
http://astronomy.activeboard.com/t15320388/ngc-1132/

NGC 1774 was discovered by John Herschel on the 23rd November 1834.
http://astronomy.activeboard.com/t62925022/ngc-1774/

NGC 1887 was discovered by John Herschel on the 23rd November 1834.
http://astronomy.activeboard.com/t62925861/ngc-1887/

NGC 1902 was discovered by John Herschel on the 23rd November 1834.
http://astronomy.activeboard.com/t55679052/ngc-1902/

NGC 1934 was discovered by John Herschel on the 23rd November 1834.
http://astronomy.activeboard.com/t62925869/ngc-1934/

NGC 1935 was discovered by John Herschel on the 23rd November 1834.
http://astronomy.activeboard.com/t62925889/ngc-1935/

NGC 2109 was discovered by John Herschel on the 23rd November 1834.
http://astronomy.activeboard.com/t55679134/ngc-2109/

NGC 2117 was discovered by John Herschel on the 23rd November 1834.
http://astronomy.activeboard.com/t62925895/ngc-2117/

NGC 2135 was discovered by John Herschel on the 23rd November 1834.
http://astronomy.activeboard.com/t55679176/ngc-2135/