Spacewalkers Rex Walheim and Stanley Love installed science experiments to the outside of the station's new Columbus Lab.
Walheim's father and brother live in Tulare County.
Atlantis is set to undock from the space station on Monday and land in Florida on Wednesday.
People here in the Valley have several chances to see the international space station with the naked eye.
First is about an hour from now.
Click the link for: Satellite Sighting Information