It's kind of sad when you think about it. We like to think of ourselves as advanced, but 1000's of years ago, people could look up at the sky & recognize most of the things up there. (Though, comets did have a tendency to throw them off a bit.) Nowadays, it's unusual to find someone who can point upward and know the name of even one star (besides the sun). Most idiots can find the big dipper, if they're lucky, but cannot locate easily found stars. It's not as if there are even that many stars visible to the naked eye from Earth. (15k-ish), but there aren't really that many very bright stars. And, if you occasionally looked upward, you'd eventually start recognizing, "hey, that thing's not usually there. Must be a wanderer (planet)." And, eventually, you would recognize the patterns of some of those planets. Hell, hundreds of years ago, with fairly crude instruments, they figured out that the orbits were elliptical, rather than perfectly circular, despite the fact that if you were away from the solar system and looked at the shapes of the orbits, you would not be able to distinguish the difference with your eyes, because the orbits are so close to being circular.