Transit of Venus on December 6, 1882http://astro.ukho.gov.uk/nao/transit/V_1882/
On December 6, 1592 'a guest star was seen at Chun Chang'http://articles.adsabs.harvard.edu//full/1968JKAS....1...29C/0000031.000.html
The Halifax Explosion occurred on Thursday, December 6, 1917http://astronomy.activeboard.com/t46586609/the-halifax-explosion/The United States Naval Observatory was established in 1830http://en.wikipedia.org/wiki/United_States_Naval_Observatory#History
The Unity connecting module was docked in orbit in 1998http://astronomy.activeboard.com/t52150798/unity-connecting-module/Launch of the Vanguard TV3 on December 6, 1957http://en.wikipedia.org/wiki/Vanguard_TV3
Luna 8 suffered a hard impact on the lunar surface on the 6 December 1965https://en.wikipedia.org/wiki/Luna_8The Chang'e 3 orbiter entered lunar orbit on the 6th December 2013https://en.wikipedia.org/wiki/Chang%27e_3
Yoshio Nishina (December 6, 1890 - January 10, 1951) was the founding father of modern physics research in Japan. http://en.wikipedia.org/wiki/Yoshio_NishinaJoseph Louis Gay-Lussac (6 December 1778 - 9 May 1850) was a French chemist and physicist.http://en.wikipedia.org/wiki/Joseph_Louis_Gay-LussacJohann Palisa (December 6, 1848 - May 2, 1925) was an Austrian astronomerhttp://astronomy.activeboard.com/t46586595/johann-palisa-1848-1925/Károly Nagy (6 December 1797 - 2 March 1868) was an Hungarian astronomerhttp://en.wikipedia.org/wiki/K%C3%A1roly_NagyWilliam Thomson "Will" Hay (6 December 1888 - 18 April 1949) was an English comedianhttp://astronomy.activeboard.com/t51809407/will-hay-1888-1949/Niccolò Zucchi (December 6, 1586 - May 21, 1670) was an Italian Jesuit, astronomer, and physicist.http://astronomy.activeboard.com/t46586598/niccol-zucchi-1586-1670/Saint Nicholas (270 - 6 December 343) was a historic 4th-century sainthttp://astronomy.activeboard.com/t46586590/saint-nicholas-270-6-december-343/
The Nefertiti bust was found on 6 December 1912 at Amarna http://en.wikipedia.org/wiki/Nefertiti_Bust#Discovery
Star Trek: "The Empath" was first broadcast December 6, 1968.
NGC 12 was discovered by German-British astronomer William Herschel on the 6th December 1790.http://astronomy.activeboard.com/t55813861/ngc-12/
The December Phoenicids (PHO) are a minor periodic showerhttp://astronomy.activeboard.com/t39579581/phoenicids/The first known sighting of the Andromedids was December 6, 1741 over St Petersburg, Russiahttp://en.wikipedia.org/wiki/Andromedids
MeteoritesThe Cangas de Onis (H5) meteorite fell in Asturias, Spain, on the 6th December, 1866.http://astronomy.activeboard.com/t46586620/cangas-de-onis-meteorite/