You can resize the sun path by modifying its display size or by fitting it to an updated model:
The display size of the sun path in a 2D or 3D view is determined by the size of the bounding box that encompasses the visible model elements. By default, the sun path is displayed at 150% of the model radius in the view. In some cases, such as when you zoom in on a view, you might find it helpful to change the display size of the sun path.
To change the display size
As you change the size of the model or the visibility of its elements, the size of the bounding box updates automatically. To update the size of the sun path in proportion to the resized bounding box, do one of the following: