Apollo Soyuz Test Project in orbit. Illustration of the Apollo Soyuz Test Project (ASTP) in orbit over the Earth. The ASTP mission was the first joint international manned space-flight. It took place from 15-24th July 1975. A Russian Soyuz 19 (right) and American Apollo CSM-111 (left) spacecraft docked in orbit on 17th July to test a jointly-designed international docking mechanism.
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