The December 2010 lunar eclipse occurred on December 21, coinciding with the December solstice.http://astronomy.activeboard.com/t39061104/december-21st-2010-lunar-eclipse/
The Divalia is a Roman festival held on December 21st, in honour of the goddess Angeronahttp://astronomy.activeboard.com/t46862911/divalia/
At Newgrange prehistoric monument the rising sun shines along the long passage into the chamberhttp://en.wikipedia.org/wiki/NewgrangeDowth is a Neolithic passage tomb which stands in the Boyne Valleyhttp://en.wikipedia.org/wiki/DowthRondane National Park was established on 21 December 1962http://astronomy.activeboard.com/t51989820/rondane-national-park/
Drilling at Dome C began in 1996 and was completed on December 21, 2004http://en.wikipedia.org/wiki/Concordia_Station#Glaciology
The Challenger expedition sailed from Portsmouth, England, on 21 December 1872http://astronomy.activeboard.com/t46609470/hms-challenger/
Luna 13 was launched in 1966http://astronomy.activeboard.com/t46862874/luna-13/Apollo 8 was launched on December 21, 1968http://astronomy.activeboard.com/t46862897/apollo-8/Venera 12 landed on the surface of Venus on 21 December 1978http://en.wikipedia.org/wiki/Venera_12The Soviet Vega 2 space probe was launched on 21 December 1984http://en.wikipedia.org/wiki/Vega_2The Sparkie (or 3CS-1) satellite failed to achieve orbit on 21 December 2004http://en.wikipedia.org/wiki/Sparkie_(satellite)Soyuz TM-4 was Launched in December 1987http://en.wikipedia.org/wiki/Soyuz_TM-4Soyuz TMA-3M (29S) with Expedition 30, was launched on 21st December, 2011. http://astronomy.activeboard.com/t46622929/soyuz-tma-03m29s/
Millie Elizabeth Hughes-Fulford is an American medical investigatorhttp://en.wikipedia.org/wiki/Millie_Hughes-FulfordRobert Brown (21 December 1773 - 10 June 1858) was a Scottish botanisthttp://en.wikipedia.org/wiki/Robert_Brown_(botanist)Ira Sprague Bowen (December 21, 1898 - February 6, 1973) was an American astronomer.http://astronomy.activeboard.com/t46862867/ira-sprague-bowen-1898-1973/Donald Eugene Brownlee (born December 21, 1943) is a professor of astronomyhttp://en.wikipedia.org/wiki/Donald_E._BrownleeGiuseppe Forti (December 21, 1939 - July 2, 2007) was an Italian astronomerhttp://en.wikipedia.org/wiki/Giuseppe_FortiTarmo Oja (born December 21, 1934) is a professor in astronomy at Uppsala Universityhttp://en.wikipedia.org/wiki/Tarmo_OjaGraeme Bryce Segal (born 21 December 1941) is a British mathematicianhttp://en.wikipedia.org/wiki/Graeme_Segal
On December 21, 1913, Arthur Wynne, a journalist from Liverpool, England, published a "word-cross" puzzlehttp://en.wikipedia.org/wiki/Crossword_puzzle#History
Snow White and the Seven Dwarfs premiered at the Carthay Circle Theatre on December 21, 1937http://astronomy.activeboard.com/t46862871/snow-white-and-the-seven-dwarfs/The final episode of Blake 7 was broadcast on 21 December 1981.
NGC 193 was discovered by William Herschel on the 21st December 1786.http://astronomy.activeboard.com/t55997059/ngc-193/
The Kansas Meteor procession of December 21, 1876http://archive.org/stream/reportannualmee05sciegoog#page/n258/mode/1up
MeteoritesThe Rochester (H6) meteorite fell in Indiana, USA, on the 21st December, 1876.http://astronomy.activeboard.com/t46862884/rochester-meteorite/The Nakhon Pathom (L6) meteorite fell in Nakhon Pathom, Thailand, on the 21st December, 1923.http://astronomy.activeboard.com/t46862889/nakhon-pathom-meteorite/