I like the way you put that, "... searching the '2d' sky...". But that brings. Question to my mind. If we had another observatory, say Mars or, if needed, one of the outer planets/their moons, is it possible THAT observatory would detect different stars? I mean, the vast majority would be the same, but since the origin of where it was looking from would be different....

Or would said observatory have to be in another system to attain that effect? I realize that even Pluto is a close neighbor when it comes to interstellar distance.