Apollo - Soyuz

Apollo Soyuz was the first international manned spaceflight. It was designed to test the compatibility of rendezvous and docking systems for American and Soviet spacecraft, to open the way for international space rescue as well as future joint manned flights.

The existing American Apollo and Soviet Soyuz spacecraft were used. The Apollo spacecraft was nearly identical to the one that orbited the Moon and later carried astronauts to Skylab. The Soyuz craft was the primary Soviet spacecraft used for manned flight since its introduction in 1967. A docking module was designed and constructed by NASA to serve as an airlock and transfer corridor between the two craft.

The Flight of the Apollo Soyuz Test Project

July 15-24, 1975

Apollo Crew : Thomas P. Stafford, Vance D. Brand, Donald K. Slayton

Soyuz Crew: Valeriy Nikolayevich Kubasov, Alexei Arhipovich Leonov

09 days, 07 hours, 28 minutes

The Soyuz was launched just over seven hours prior to the launch of the Apollo CSM. Apollo then maneuvered to rendezvous and docking 52 hours after the Soyuz launch. The Apollo and Soyuz crews conducted a variety of experiments over a two-day period. After separation, Apollo remained in space an additional 06 days. Soyuz returned to Earth approximately 43 hours after separation.

Source: NASA