'horizon'), GRAU index 11F662, was a series of 35 Russian, previously Soviet, geosynchronous communications satellites launched between 1978 and 2000.

The program was started in order to develop a satellite system to relay coverage of the 1980 Olympic Games from Moscow.

Following the 1980 Olympics, some of the surplus C-Band capacity on the satellites was used to distribute Television in the Soviet Union both to relay transmitters within the USSR (where the vast physical size of the country made conventional distribution to remote areas difficult) and to other Eastern Bloc and allied countries for relay to Soviet troops stationed there.

[2] In this application, Gorizont was (except at high latitudes) the successor to the Orbita system which used non-geostationary Molniya satellites.

Gorizont represented an improvement in channel capacity and could be picked up on less elaborate receiving systems.