I live in the middle of a very dark area. Lately I have been playing with some Generation 3+ night vision equipment and one clear night I pointed it up at the heavens. Wow. You have no idea how much more there is up there. And satellites! I was seeing them mostly headed north every few minutes. Sometimes one would go south on the same track. Then a big reddish one came west to east.
The north-south tracks are mostly spy satellites. As the earth turns under the plane of the orbit each track views a different slice of the surface, allowing everywhere to fall under its watchful eye twice a day.