Portal:Spaceflight/On This Day/20 April

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• 1964 - A Molniya-M fails to launch an unknown satellite.
• 1966 - A Vostok 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 manned Soyuz T-8 mission.
• 1988 - A Vostok-M 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 launches the Astra 1KR satellite.