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September 14th in Astronomy and Space Science
Death1712Italian-French astronomer Giovanni Cassini dies. He accurately determined the rotational periods of both Jupiter and Mars, discovered four of Saturn's moons (Iapetus, Rhea, Tethys, and Dione) and the dark gap in Saturn's rings now known as Cassini's division. He also conducted extensive observations of the zodiacal light and determined it to be of cosmic origin and not a weather phenomenon as previously believed.
Unmanned Spaceflight1978USSR launches the Venera 12 spacecraft. It lands on Venus on 21 Dec 1978 and transmits data for 95 minutes.
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