Saljut 4, the fourth russian Orbitalstation was launched on 16 of december 1974.
This Orbitalstation was more constructed for civil purpose and less for miltary observations.
Sojus 17 was the first mission which docked at the station and the crew stayed nearly 30 days there.
After Sojus 17, only two more Sojus spaceships visited the Orbitalstation, Sojus 18B and Sojus 20 which was unmanned.
On 3 of february 1977, after 12.188 orbits the Orbitalstation Saljut 4 entered the atmosphere and burned during this step as calculated.
Sojus 17 launch 10.01.1975 Alexej Gubarjew (USSR)
docking to Saljut 4 12.01.1975 Georgi Gretschko (USSR)
undocking 09.02.1975
landing 09.02.1975
Back to Earth crew:
same
479 Orbits
Sojus 18A launch 05.04.1975 Wassili Lasarew (USSR)
(Sojus 18-1) docking to Saljut 4 no docking Oleg Makarow (USSR)
undocking
landing 05.04.1975
Back to Earth crew:
same
There was no full orbit achieved due to explosion of the rocket, only a suborbitalflight of around
minutes have been realizes and the crew survived this disaster.
Sojus 18B launch 24.05.1975 Pjotr Klimuk (USSR)
docking to Saljut 4 25.05.1975 Witali Sewastjanow (USSR)
undocking 26.07.1975
landing 26.07.1975
Back to Earth crew:
same
993 Orbits
Sojus 19 (ASTP) launch 15.07.1975 Alexei Leonow (USSR)
docking to Apollo 17.07.1975 Waleri Kubassow (USSR)
undocking 19.07.1975
landing 21.07.1975
Apollo Sojus test project
Back to Earth crew:
same
97 Orbits
Flight not to Saljut 4, but docking with the US Apollo spaceship
First time in history that the both nations USA and USSR have done and carried out together a
joint space mission with docking of the two spaceships Sojus 19 and Apollo.
In the Apollospaceship flown the US astronauts Thomas Stafford, Vance Brand and Deke Slayton.
Sojus 20 launch 17.11.1975 unmanned
docking to Saljut 4 19.11.1975
undocking 15.02.1976
landing 16.02.1976
1470 Orbits