I'm always a bit hesitant to inject realism into these types of discussions because the game is a real-time strategy, and in the 6 hours it takes to complete a fairly long game, the "real" Earth only moves about a quarter of a degree around the sun.
The problem with that example is that time in any RTS is always significantly compressed. Just as an example, look at the Kol. Imagine it takes as long to build in reality, as a Nimitz Carrier. The
Nimitz took 8 years, from conception to commission. A Kol is built in 45 seconds. That means that the Earth would actually orbit the sun (in game terms) once every 5.6 seconds!
Now this is obviously unreasonable. I'd propose that game time is actually super compressed for the game's sake, so that things actually end up getting done on a reasonable time frame. If we were to say, triple all build times then shrink "real time" equivalents (I'd justify it as a technological advance, shortening both communication as well as construction time), it may play out more reasonably. I would actually be in favor of this in general, since it certainly makes the game play more ala turn based strategy, where infrastructure is king (that second, third, or fourth frigate factory will be REALLY important now...), and small combat elements must be used to full effect simply because it takes way too long to amass the typical endgame fleet seen in vanilla sins.
In any event, like Das123 points out, the actual phase connections wouldn't change much, except between bodies very close to the sun. The only real difference on the whole would be the occasional "cutoff" from a gravity well intersecting a phase line.
More on realism in games, I really enjoy sins the way it is. It's fun, it's absorbing, it's engaging. But I always long for an option or mod that allows me to perform a "what if" in my games. I like being able to simulate reality as closely as possible just to get a glimpse at what possibilities exist, out of reach. This is why I love really hardcore tactical shooters (OFP, upcoming Ground Branch) as well. I love to try to get as close as possible to how it works, how it feels, without actually having to be there (or have a medic pull 5.56 fragments from my sucking chest wound from an unfortunate blue on blue incident...).
I'm looking at getting Falcon 4.0 now... I've only played one really good flight sim, but it was a chopper one.