[r9etb]

I'm not sure how "North" and "South" were arrived at in that case.

"North" is defined using the good old "right hand rule." If you curl the fingers of your right hand in the direction of the rotation of the body, your right thumb will be pointing along the angular momentum vector, and thus, by definition, "north." Try it.

[VadeRetro]

... the good old "right hand rule."

Ouch! Should have known.