The Earth crosses the solar equator on the 7th.SN 185 (aka RCW 86) was a supernova which appeared in the year 185 CEhttp://en.wikipedia.org/wiki/SN_185The Spitak Earthquake occurred in the northern region of Armenia on Wednesday, December 7, 1988 http://en.wikipedia.org/wiki/1988_Spitak_earthquake
ATS-I, the first geostationary satellite, was launched on 7 December 1966http://www.nasa.gov/centers/goddard/missions/ats_prt.htmApollo 17 was launched on December 7, 1972http://en.wikipedia.org/wiki/Apollo_17The Galileo spacecraft arrived at Jupiter on December 7, 1995http://astronomy.activeboard.com/t20921108/galileo-mission/OAO-2 Stargazer (Orbiting Astronomical Observatory 2) was a space observatory launched on December 7, 1968http://en.wikipedia.org/wiki/Orbiting_Astronomical_Observatory_2The Jason/TIMED oceanography satellite was launched in 2001http://astronomy.activeboard.com/t23024555/jason-1-oceanography-satellite/
Abd al-Rahman al-Sufi (December 7, 903. Rey, Iran - May 25, 986. Shiraz) was a Persian astronomerhttp://astronomy.activeboard.com/t51822601/abd-al-rahman-al-sufi-903-986/Gerard Peter Kuiper (December 7, 1905 - December 24, 1973) was a Dutch-American astronomerhttp://en.wikipedia.org/wiki/Gerard_Peter_KuiperWilliam Simms (7 December 1793 - 21 June 1860) was a British scientific instrument maker.http://en.wikipedia.org/wiki/William_Simms_(instrument_maker)Nicholas Michael Katz (born 7 December 1943) is an American mathematicianhttp://en.wikipedia.org/wiki/Nicholas_KatzLuigi Cremona (7 December 1830 - 10 June 1903) was an Italian mathematician.http://en.wikipedia.org/wiki/Luigi_Cremona
Stellafane held their first meeting on December 7, 1923http://en.wikipedia.org/wiki/StellafaneStar Trek: The Motion Picture was released on the 7th December, 1979.http://en.wikipedia.org/wiki/Star_Trek:_The_Motion_Picture
NGC 1802 was discovered by German-British astronomer William Herschel on the 7th December 1785.http://astronomy.activeboard.com/t55826827/ngc-1802/NGC 2266 was discovered by German-British astronomer William Herschel on the 7th December 1785.http://astronomy.activeboard.com/t55826871/ngc-2266/NGC 2770 was discovered by German-British astronomer William Herschel on the 7th December 1785.http://astronomy.activeboard.com/t15039443/ngc-2770/
NGC 2832 was likely first discovered by William Herschelon the 7th December 1785http://astronomy.activeboard.com/t57004732/ngc-2832/NGC 3003 was discovered by German-British astronomer William Herschel on the 7th December 1785. http://astronomy.activeboard.com/t55826339/ngc-3003/NGC 3021 was discovered by German-British astronomer William Herschel on the 7th December 1785. http://astronomy.activeboard.com/t55826325/ngc-3021/NGC 3395 was discovered by German-British astronomer William Herschel on the 7th December 1785.http://astronomy.activeboard.com/t55826301/ngc-3395/NGC 3396 was discovered by German-British astronomer William Herschel on the 7th December 1785.http://astronomy.activeboard.com/t55826291/ngc-3396/NGC 3735 was discovered by German-British astronomer William Herschel on the 7th December 1801.http://astronomy.activeboard.com/t55826234/ngc-3735/
The Great Southern Comet of 1947 was first seen as a brilliant object in the evening twilight on December 7 http://books.google.co.uk/books?id=DFgMAaU3vA8C&pg=PA236#v=onepage&q&f=false
Asteroid (737) Arequipa was dicovered by Joel Hastings Metcalf on the 7th December 1912https://en.wikipedia.org/wiki/737_Arequipa
MeteoritesThe Tourinnes-la-Grosse (L6) meteorite fell in Nivelles, Belgium, on the 7th December, 1863.http://astronomy.activeboard.com/t46609457/tourinnes-la-grosse-meteorite/