Soyuz 18, of the Soyuz spacecraft series, brought cosmonauts Pyotr Klimuk and Vitali Sevastyanov to the Salyut 4 space station where they remained in orbit for 63 days. May 24 is the 144th day of the year in the Gregorian calendar (145th in leap years). ... 1975 was a common year starting on Wednesday (the link is to a full 1975 calendar). ... UTC also stands for the University of Tennessee at Chattanooga Coordinated Universal Time or UTC, also sometimes referred to as Zulu time, the basis for civil time, differs by an integral number of seconds from atomic time and a fractional number of seconds from UT1. ... The Baikonur Cosmodrome (Russian: Космодром Байконур, Kosmodrom Baykonur), also called Tyuratam, is the worlds oldest and largest working space launch facility. ... July 26 is the 207th day (208th in leap years) of the year in the Gregorian Calendar, with 158 days remaining. ... 1975 was a common year starting on Wednesday (the link is to a full 1975 calendar). ... Soyuz TMA-6 spacecraft approaching International Space Station Soyuz 19 spacecraft as seen from Apollo CM Soyuz spacecraft of the Apollo Soyuz Test Project (ASTP) Early 7K-OK Soyuz at National Space Centre, Leicester, England Soyuz (Союз, union) is a series of spacecraft designed by Sergey Korolev for the Soviet Union... U.S. Space Shuttle astronaut Bruce McCandless II using a manned maneuvering unit. ... Pyotr Ilyich Klimuk (Belarusian: Пётр Ільі́ч Кліму́к; Russian: Пётр Ильи́ч Климу́к; born July 10, 1942 in Komarovka, USSR (now in Belarus)) was a Soviet cosmonaut who made three flights into space. ... Vitali Ivanovich Sevastyanov, cyrillic Виталий Иванович Севастьянов, (born July 8, 1935 in Krasnouralsk) was a Soviet cosmonaut who flew on the Soyuz 9 and Soyuz 18 missions. ... Salyut 4 (DOS 4) was a Salyut space station launched on December 26, 1974 into an orbit with an apogee of 355 km, a perigee of 343 km and an orbital inclination of 51. ... A space station is an artificial structure designed for humans to live on in outer space. ...

The focus of the mission seems to have been research into long-term stays in space, with the crew performing various biomedical experiments and growing plants in orbit. They also made observations of the Earth and Sun.

The name Soyuz 18 was also given to an earlier, unsuccessful Soyuz flight that is now often referred to as Soyuz 18-1 or Soyuz 18a. Soyuz 18 was a Soyuz spacecraft launched by the Soviet Union but which failed to achieve orbit due to a serious malfunction during launch. ...

Crew

• Pyotr Klimuk (2)
• Vitali Sevastyanov (2)

Pyotr Ilyich Klimuk (Belarusian: Пётр Ільі́ч Кліму́к; Russian: Пётр Ильи́ч Климу́к; born July 10, 1942 in Komarovka, USSR (now in Belarus)) was a Soviet cosmonaut who made three flights into space. ... Vitali Ivanovich Sevastyanov, cyrillic Виталий Иванович Севастьянов, (born July 8, 1935 in Krasnouralsk) was a Soviet cosmonaut who flew on the Soyuz 9 and Soyuz 18 missions. ...

Mission Parameters

• Mass: 6825 kg
• Perigee: 186 km
• Apogee: 230 km
• Inclination: 51.7°
• Period: 88.6 minutes

Soyuz 18 was a Soyuz spacecraft launched by the Soviet Union but which failed to achieve orbit due to a serious malfunction during launch. ... The Soyuz human spaceflight programme was initiated in the early 1960s as part of the manned lunar programme that was intended to put a Soviet cosmonaut on the Moon. ... The Apollo-Soyuz Test Project was the first joint flight of the US and Soviet space programs. ...