Sorry to revive an old thread, but I just read an interesting thought that I figured could add something here.
In Manly Hall's Secret Teachings of All Ages, he discusses the idea of Elementals; beings of an etheric nature. Now, don't get me wrong, Hall was a bit of a whack job, but we're not discussing what is true, we're discussing the beliefs of those who created the ritual.
He says: "Mediæval mystics gave a corner of creation (one of the cardinal points) to each of the four kingdoms of Nature spirits, and because of their earthy character the gnomes were assigned to the North--the place recognized by the ancients as the source of darkness and death. One of the four main divisions of human disposition was also assigned to the gnomes, and because so many of them dwelt in the darkness of caves and the gloom of forests their temperament was said to be melancholy, gloomy, and despondent. By this it is not meant that they themselves are of such disposition, but rather that they have special control over elements of similar consistency."
In the Gnostic and Hermetic philosophies, the material world is seen as the antithesis of the spiritual world and in some cases, evil. If the men creating these rituals were of the same idea as Hall and the Gnostics, then they may have felt that the north offered no spiritual light.
I know, it's a bit of a reach, but...this is all about various theories anyway, right?