Syncom 3 was the first geostationary satellite. August 19, 1964 at 12:15 UTC · Launch Successful Thor Delta D — United States Air Force, to Geosynchronous Orbit Space Launch Complex 17A, Cape Canaveral SFS, FL, USA The world's 349th orbital launch attempt, and 56th of 1964. Data: Launch Library 2, The Space Devs.