RELATIVISTIC EFFECTS ARE negligible at one-third light speed, but there is considerable time lag. A Q ship takes 12 years to travel between Avalon and Ult from the point of view of the passengers—neglecting time for acceleration and deceleration, which adds a few months. An observer on Ult, though, sees the ship taking only 8 years, and an observer on Avalon 16 years.
A Boy's Book of Space (59th Edition, Cashalix, 29302)