Just today I was studying the sign of Apophis, and I noticed an interesting correlation between this card and the Aeon. Here is the sign of the murderer of the Dying God, perhaps symbolizing the end of that age of the world. The spirituality is still solar, but is now undying, and the "dogma" he brings is perhaps that of the new Aeon. In the Aeon, Horus's attitude seems similar, only his hand is empty. Haven't gotten to that one yet, but I seem to remember Harris saying in the gallery notes that his hand is empty because the old world has been destroyed but a new one has not yet been built.
Horus the Son=Vau=Hierophant
Also, Horus was the divine falcon, but was also linked to the constellation of Taurus.