Slow moving line of "stars"

In South Union after dark, I saw what appeared to be ~30-40 lights in the Eastern part of the sky going North to South.
 It looked like if you've ever seen a satellite at night; like a shooting star but very slow with a constant speed and brightness with no blinking lights.  However, in this case there were about 30-40 of these "stars" that were fairly close together, moving in a line parallel with the horizon and in the Eastern sky going from North to South.  The "stars" did have a constant speed and the did not move up or down.  They were in a perfect line and covered roughly 25 degrees of the sky.
 Eventually, they all just kind of slowly faded away as they made it further along the sky.  Either they became too far away to see or there was some hazy cloud cover they went behind.
 I would estimate that the viewing angle would be right at 35-40 degrees from the horizon.