Portal:Spaceflight/On This Day/20 April

• 1964 - A Molniya-M fails to launch an unknown satellite.
• 1966 - A Vostok-2 rocket launches the Kosmos 115 satellite.
• 1967 - A Delta E launches the ESSA 5 satellite.
• 1968 - A Voskhod rocket launches the Kosmos 216 satellite.
• 1973 - A Delta 1914 launches the Anik A2 satellite.
• 1974 - A Molniya-M launches a Molniya-1 satellite.
• 1977 - A Soyuz-U launches the Kosmos 904 satellite.
• 1977 - A Delta 2914 launches the Geos 1 satellite.
• 1978 - A Soyuz-U launches the Kosmos 1003 satellite.
• 1979 - A Soyuz-U launches the Kosmos 1095 satellite.
• 1983 - A Soyuz-U launches the crewed Soyuz T-8 mission.
• 1988 - A Vostok-2M launches the Kosmos 1939 satellite.
• 1989 - A Soyuz-U launches the Kosmos 2018 satellite.
• 1990 - A Kosmos-3M launches the Kosmos 2074 satellite.
• 1996 - An Ariane 4 launches the MSAT-1 satellite.
• 2004 - A Delta II launches the Gravity Probe B satellite.
• 2006 - An Atlas V 411 launches the Astra 1KR satellite.
• 2009 - A PSLV launches the RISAT-2 and ANUSAT satellites.
• 2009 - A Zenit-3SL launches the Sicral 1B satellite.
• 2011 - A PSLV launches Resourcesat-2 and two other satellites.
• 2012 - A Soyuz-U launches the Progress M-15M spacecraft to resupply the ISS.
• 2017 - A Soyuz-FG launches the crewed Soyuz MS-04 mission to the ISS