Geostationary Satellites...

Look closely at this time-lapse movie and you'll see a line of “stars” that don't move as the real stars rotate.  Those are geostationary satellites – mostly telecommunications satellites – all orbiting about 25,000 miles high.  Their orbits take 24 hours, so they appear to be motionless in the sky above us.  They're all very close to the Earth's equatorial plane; if they were off this plane, they would appear to make a figure-eight pattern in the sky.  From APOD, of course.