Portal:Spaceflight/On This Day/20 December


 * 1960 - A Thor-Agena launches the Discoverer 19 satellite.
 * 1966 - A Lambda-4S fails to launch an unknown satellite.
 * 1969 - A Kosmos-3M launches the Kosmos 315 satellite.
 * 1971 - An Atlas-Centaur launches the Intelsat 403 satellite.
 * 1972 - An Atlas-Agena launches an AFP-827 satellite.
 * 1977 - A Soyuz-U launches the Kosmos 969 satellite.
 * 1978 - A Kosmos-3M fails to launch the Kosmos 1064 satellite.
 * 1981 - An Ariane 1 launches the Marecs 1 satellite.
 * 1984 - A Kosmos-3M launches the Kosmos 1615 satellite.
 * 1989 - A Soyuz-U2 launches the Progress M-2 spacecraft to resupply Salyut 6.
 * 1990 - A Proton-K launches a Raduga satellite.
 * 1994 - A Kosmos-3M launches the Kosmos 2298 satellite.
 * 1995 - A Tsyklon-2 launches the Kosmos 2326 satellite.
 * 1996 - A Kosmos-3M launches the Kosmos 2336 satellite.
 * 1996 - A Titan IV launches the USA-129 satellite.
 * 1997 - A Soyuz-U launches the Progress M-37 spacecraft to resupply Mir.
 * 1997 - A Delta II launches five Iridium satellites.
 * 1999 - launches on mission STS-103 to repair the Hubble Space Telescope.
 * 2000 - An Ariane 5 launches the Astra 2D, GE-8 and LDREX satellites.
 * 2000 - A Long March 3A launches a Beidou satellite.
 * 2002 - A Dnepr-1 launches the LatinSat-1, LatinSat-2, SaudiSat-1S, UniSat-2 and Rubin-2 satellites.
 * 2007 - A Delta II launches the GPS IIR-18 satellite.
 * 2008 - An Ariane 5 launches the Hot Bird 9 and Eutelsat W2M satellites.
 * 2009 - A Soyuz-FG launches the Soyuz TMA-17 mission with the Expedition 22 crew of the ISS.
 * 2013 - A Long March 3B launches the Túpac Katari 1 satellite.