July 18, 1975. This scene photographed from a rendezvous window of the American Apollo spacecraft in Earth orbit shows

July 18, 1975. This scene photographed from a rendezvous window of the American Apollo spacecraft in Earth orbit shows the Soviet Soyuz spacecraft contrasted against a black-sky background with a heavily cloud-covered Earth below. The three major components of the Soyuz are the spherical-shaped Orbital Module, the bell-shaped Descent Vehicle, the cylindrical-shaped Instrument Assembly Module. The docking system on the Orbital Module was specially designed to interface with the docking system on the Apollo's Docking Module. The ASTP astronauts and cosmonauts visited each other's spacecraft while the Soyuz and Apollo were docked in Earth orbit for two days.