Portal:Spaceflight/On This Day/4 August

• 1961 - A Thor-Agena fails to launch the Discoverer 28 satellite.
• 1966 - A Scout B launches the OV3-3 satellite.
• 1976 - A Soyuz-U launches the Kosmos 847 satellite.
• 1977 - A Proton-K fails to launch an unknown satellite.
• 1981 - A Molniya-M launches the Kosmos 1285 satellite.
• 1981 - A Tsyklon-2 launches the Kosmos 1286 satellite.
• 1982 - A Soyuz-U launches the Kosmos 1399 satellite.
• 1984 - An Ariane 3 launches the ECS-2 and Telecom 1A satellites.
• 1986 - A Tsyklon-2 launches the Kosmos 1769 satellite.
• 1993 - A Molniya-M launches a Molniya-3 satellite.
• 2004 - A Proton-M launches the Amazonas-1 satellite.
• 2006 - A Proton-M launches the Hot Bird 8 satellite.
• 2007 - A Delta II launches the Phoenix probe to Mars.
• 2010 - An Ariane 5 ECA launches the Nilesat 201 and RASCOM-QAF 1R satellites.