First geostationary communications satellite

According to Official Guinness Records,

The first communications satellite to operate in the geostationary orbit was Syncom 3. It was launched from Cape Canaveral, Florida, USA, on 19 August 1964 and manoeuvred to its orbit, some 35,788 km (22,238 miles) above the Earth. At this altitude, Syncom 3 took exactly 24 hours to orbit the Earth and so appeared stationary from the ground. Today more than 200 satellites operate in the geostationary or 'Clarke' orbit.

For a complete list of 1964 records, please visit 1964 Guinness Records in United States.

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