8 ms·

Any tidally locked satellite such as the moon.

• zmgsabst 3y ago
  A tidally locked satellite rotates: one rotation per orbit.
  • this_was_posted 3y ago
    unless the body it rotates around rotates at the exact same speed around another body in the opposite direction
    • jacquesm 3y ago
      Then it still rotates.
      • throwaway290 3y ago
        It can only rotate relative to an arbitrary point, not in some objective absolute sense. Here it does not rotate relative to chosen point.
        • jacquesm 3y ago
          Something about privileged reference frames...
          • throwaway290 3y ago
            But what's the alternative, right?