Long line of lights moving silently across the sky.

We noticed a string of lights moving across the sky above our house, from West to East at pretty high altitude. We counted 30, but there may have been more. They moved at a consistent rate of speed, and they were spaced out fairly evenly, although the spaces between them varied somewhat. There was no aircraft noise of any kind. We tried to record video on a phone, but the individual lights were not bright enough to show up. We watched until the lines of lights ended. It was very eerie.