Soyuz7K-OK was the first generation of Soyuz spacecraft and was flown between 1967 and 1971. The 7K-OK was used for the first ferry flights to the Salyut
second generation of the Soyuz spacecraft, the Soyuz7K-T, comprised Soyuz 12 through Soyuz40 (1973–1981). In the wake of the Soyuz 11 tragedy, the spacecraft
0 km (134.8 mi; 117.2 nmi) Inclination: 51.6° Period: 88.3 minutes The Soyuz7K-OKS spacecraft was launched on 6 June 1971, from the Baikonur Cosmodrome