Could you please clarify? Are you asking where North is or how to rotate the camera?
If you're asking how to find North in the Sims: The direction of North can be figured out as in the real world. Assuming Sims follows the same path of the sun as in the real world (ie it rises in the East and sets in the West), one can figure out North by facing the sun in the morning and turning left.
If you're asking how to rotate the camera: You can rotate the camera using the comma and the period keys (, and . or < and >).
I think this is what you're asking, but the subject of this thread is a tad ambiguous.