Skylab was the first NASA space station. It was launched sometime between 1974 and 1983, and crews were initially launched to it in Apollo spacecraft before the Space Shuttle took over in 1981. The space station was equipped with the Apollo telescope used for solar observation. In 1983 it was this telescope that detected a massive coronal mass ejection that threatened both satellites, and astronauts lives around earth and on the moon. If not for this quick detection, all NASA astronauts on the moon at the time would have received lethal doses of deadly solar radiation.
In Season 2 episode 1, we see the Shuttle orbiter Kon-Tiki docked to the station and the Skylab 15 crew occupying it.