The Bundahisn is also known as the Zoroastrian Genesis. If we compare it with the Genesis of the Old Testament we find that there is more direct astrological reference. As we will see in our later discussion, this does not mean that there is no astrology in Genesis. Before looking more closely at the Horoscope of the World we need to form a clear picture of the Zoroastrian cosmology. In it there are two opposing principles. There is the fullness of being which is expressed in the World of Light and represented by Ahura Mazdao, the Lord of Light and Wisdom. Opposed to this is the negation of being and light expressed in the Abyss and represented by Ahriman, the Adversary. These two principles are irreconcilable and at war with each other. Their battlefield is creation. The Zoroastrian cosmology is a complex one and so we would misunderstand it if we merely said it divides the world into black and white. What we need to understand is that to each aspect of Fullness there is a power that negates it.
The Horoscope of the World shows the moment of the Fall. Before the Fall, all of the planets were in the sign of their exaltation. The Sun was always on the meridian. It was always day. All of creation was filled with the Light of the World. The Bundahisn states that, “Until the coming of the Adversary, the Moon, the Sun and the stars were standing still, they did not move, and were passing their time with purity, and it was always mid-day; after the coming of the Adversary, they were in motion and would not desist from that motion, until the end.” (Stanza 2:17)
With the Fall the dragon entered the scene. His head in the 12th house of misfortune in Gemini, his tail in Sagittarius. The ruler of Gemini, Mercury was the first poisoned and the first to fall. That is why in this chart Mercury is placed with Venus in the ninth house in his detriment and fall. Mercury was poisoned and became poison. It might be noted here that Mercury is the only planet that can be in his detriment and fall, and this is in Pisces. He received a double-whammy so to speak. From there the rest of creation became infected. The Sun which was on the meridian moved into the ninth house, by primary motion, to remedy the situation, and in so doing also moved into a cadent or falling house. The Sun made the first step towards his setting, celestial movement and the cycle of night and day began. Parallel to this, the shift of the Sun from the pre-fall house of God to the 9th house sets another remedial action in motion. The 9th house becomes the house of God. The secondary movement, in the opposite direction, of the mundane houses also began.
Although in the text an eclipse is described, the astronomical situation is not shown in this chart. We must remember that before this event there was no movement. The first eclipse is the entry of the dragon and is repeated astronomically ever afterwards. We also have to remember that with the dragon creation became occluded, a first level of turgidity distorts what had once been pure.