I can not find any reference for this, but it seems to me that Skylab, unlike the International Space Station, had a fixed attitude instead of rotating to have the same side always facing the Earth.
The reasons I suspect that was the case:
- On all the photographs I can find of the station, the unscrambled solar panel of the station and the panels of the Apollo service module are pointing in the same fixed direction.
- The provisional sunshade was installed at the same side as the solar panels was pointing.
- It had a telescope mount for observation of the Sun and the sky, something the ISS does not (the ISS only does Earth observations). That would not have been possible if the station was rotating relative to the sky.
Did Skylab actually have a fixed orientation relative to the Sun? I can not verify if that is true or not.