On 19 Jul 2015 at 10:41, Rob O'Connor wrote:
> Rupert Boleyn wrote:

> Craig Berry wrote:
>  > 5% of c relative to what? :)
>
> Rupert's idea of the cosmic microwave background serving as a
> reference is a good one.
>
> Local star as the preferred frame makes sense for in-system travel but
> has consequences for relativity, as you point out.

In most cases it's not going to make any difference a player is going to notice, being
merely a matter for the astrogation computer to deal with. However, in the grand
scheme of things, I felt that this provides a fairly universal (at least within Traveller's
known space) frame of reference.

As Traveller's FTL doesn't seem to break causality in the Trav universe, I suspect
there's a privileged frame of reference out there somewhere, and for now background
radiation is the stand-in IMTU.