You can also use the ViewCube to orbit the model. Click and drag the cube to adjust your view.
Unless you are an AutoCAD user, the term “Orbit” may be new to you. Prior to Inventor 2009, all user interface labels and tooltips, along with Help documentation, used the term “Rotate.” Though Rotate is descriptive of this particular interaction with the model, it is not technically accurate. Every view of the model is actually from the viewpoint of a mobile camera, as if you are looking at the model through a camera. When you rotate a model, the camera is actually orbiting the model.