STS-1 was the first orbital spaceflight of NASA's Space Shuttle program.
The first orbiter, Columbia, launched on 12 April 1981 and returned on
14 April, 54.5 hours later, having orbited the Earth 37 times. Columbia
carried a crew of two – mission commander John W. Young and pilot Robert
The launch occurred on the 20th anniversary of the first ever human space flight. This was a coincidence rather than a celebration of the anniversary.