A second difference is that for angels, the east is always in front of them, the west behind them, south on the right, and north on the left. However, since this is hard to understand in this world, because we turn our faces in all different directions, it needs to be explained.
All heaven turns toward the Lord as its common center, so all angels turn in the same direction. It is recognized that everything points to a common center on earth as well, but the orientation in heaven is different from that on earth. In heaven, it is the forward parts that are turned toward the common center, while on earth it is the lower parts. This orientation in our world is what we call centripetal, and also gravitational. The deeper levels of angels are effectively turned forward; and since these deeper levels manifest themselves in the face, it is the face that determines the orientation.
from Heaven and Hell, Section 142