There are thirteen constellations in the
sky, not twelve. Western astrologers use twelve signs of
the Zodiac instead of thirteen, because in Western
astrology a sign,
and a constellation,
are not the same thing.
In Western astrology the position of the star, even of an entire constellation is irrelevant. All that matters to Western astrologers is the position of the Sun, Moon, and planets along the ecliptic, that is, the longitude. Not even the latitude of a celestial body matters, and is not even looked at in most cases. It is almost as if the rest of the heavens below and above the ecliptic plane were little more than fancy background. The real Action Hero is the ecliptic plane, and the astronomical background may have value only when speaking of Astrological Ages.
What makes astrologers even more resistant to change, however, is that most of the proponents clamouring for change are professional astronomers who usually don't know a thing about real astrology, and who often don't even possess a healthy respect for practitioners of the art and science of astrology. You can change someone if you have a respect for them; it is quite a different matter changing someone whom you don't respect, particularly if that special someone has a healthy respect for him- or herself.
A Bucksfanian astrologer, however, cannot deny a basic fact: there are at least 13 constellations traced by the ecliptic, the 13th constellation being Ophiuchus, and the constellation of Orion practically touches the ecliptic!
Actually things get even more complicated when we consider the actual motion of the Sun through the constellations. According to astronomical data I've seen, the Sun enters the constellation of Orion between the 18th and 20th of June; it enters the constellation of Sextans on the 3rd of September; it enters Ophiuchus on the 29th of November; and finally, it enters Cetus on the 27th of March. A similar argument can be put forward for the Moon and the planets as well.
The figure below puts the traditional astrological map of the Zodiac in parallel with the ecliptic, and the astronomical map of the Zodiac:
|Gates of Heaven + 2
I saw in the night visions, and behold, there came with the clouds of the sky one like a son of man, and he came even to the ancient of days, and they brought him near before him. There was given him dominion, and glory, and a kingdom, that all the peoples, nations, and languages should serve him: his dominion is an everlasting dominion, which shall not pass away, and his kingdom that which shall not be destroyed.
He showed me a river of water of life, clear as crystal, proceeding out of the throne of God and of the Lamb, in the middle of its street. On this side of the river and on that was the tree of life, bearing twelve kinds of fruits, yielding its fruit every month. The leaves of the tree were for the healing of the nations. There will be no curse any more. The throne of God and of the Lamb will be in it, and his servants serve him.