The setting of The Dispossessed is a binary planet, Anarres and Urras. We are given a map of Anarres as two hemispheres, each labeled in quadrants. One hemisphere consists of Northrising, Southrising, Southsetting, Northsetting. These names could describe what is visible to an observer on Urras when Anarres is on the horizon, which would imply that Anarres is tide-locked, with that hemisphere always facing Urras; and suggests that Urras is not tide-locked (which is plausible because I think Urras is said to be heavier).
Is there anything in the text about the motions of either Anarres or Urras? Does Shevek ever notice that the other world is rising or setting?