Descripción : Molniya 1/21 was a first-generation Russian communications satellite orbited to test and perfect a system of radio communications and television broadcasting using earth satellites as active transponders and to experiment with the system in practical use.
During its apogee, Molniya 1/21 remained relatively stationary with respect to the earth below for nearly 8 of every 12 hr. By placing three or more Molniya 1 satellites in this type of orbit, spacing them suitably, and shifting their orbital planes relative to each other by 120 deg, a 24-hr/day communication system could be obtained.

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MOLNIYA-1 21 (SATELLITE) · MOLNIYA-1 26L · MOLNIYA-M BLOK ML