Rotation Lock

The Rotation Lock property determines whether the object will appear to rotate onscreen. When on, the object will appear to have no rotation, allowing the user to view one side of the object continuously even at high Simulation Speeds. However, the object will continue to experience the simulated effects of rotation, such as the spreading and retreating of ice across the surface of the Earth as the seasons pass.

Location
The Rotation Lock property is located in the Display Settings section of the Actions tab of the object's properties panel.