[Barnacle Bill]

Again, it is all a matter of how complex you want it to be. Also a matter of what assumptions you want to make about future tech. That was my point, and why I mentioned everything from Starfire speeds down to "real life" current spacecraft.

In Starfire they do provide the option to track moving bodies within the solar system, etc... Actually it is kind of weird. Computers seemingly offer the ability to make a more complex game playable, but no computer 4X game I've ever seen approaches the complexity of even the current 4th edition of Starfire (which is greatly simplified compared to late 2nd & early 3rd edition rules).