I remember it as 1/12th of a Kessel Run, easy peasy

If you're measuring galactic distances (nearest galaxy is 2 million light years away) then that's fair, but for "nearby" objects, a 3x the distance means a lot.

  > I just remember that a parsec is the same as a light
  > year. By astronomical standards of precision, that's about right.

I just multiply them by π. Close enough, and probably on par with our measuring precision anyway.

Is that the same as discarding constants in big O notation?