Warhammer 40K Fluff Discussion XV: You Must Be THIS Tall To Witness The Grimdark

[LCP]

It doesn't really matter for the purposes of the calculation. Given an arbitrary vector into the solar system (whether that's always from a fixed point or resampled from a random distribution each time), the (moving) target you have to hit to pass close to Titan is about 0.000002% of the total available solid angle. Unless your course is intentionally chosen to pass that way the chances of it just randomly lining up are slim to none.

Space, it be large.

EDIT: Here's a fun question: do warp routes' jumping-off points stay fixed with respect to local star systems over a galactic year? If so, does that mean the Warp is rotating?