The Outer Rim, or Outer Planets, (PROSE: Just War) referred to the edges of the Mutter's Spiral galaxy, in contrast to the Inner Worlds. Frontier worlds located there included the mining planet where the town of Brightedge was established. (AUDIO: Bad Day in Tinseltown)
The Outer Planets and those outside Human Space tended to use Terran Mean Time for convenience, the date being relative to Galactic Centre Adjusted, being about three-quarters of a century before the same date on Earth. (PROSE: Just War)