And to make it even more complicated, there are several norths (my spell checker doesn’t seem to like this plural form). There’s magnetic north that was important for navigation, back when people used magnetic compasses, there is geographical or true north, which is defined by earths rotational axis, and there is grid north.
Lines pointing towards geographic north converge at the poles and are thus not parallel, with the exception of where they intersect the equator. Since humans like right-angled and parallel things, grid north has been invented. Within a single cell of this grid a single direction is considered north.
If I’m not mistaken SketchUp’s geoloctaion feature uses green axis as grid north, causing true north to be off axis by up to a few degrees. True north is what is used for shadow calculations. I think the imageryis also aligned with true north, causing it to be slightly off axis in the model, but parallel to the solar north direction.