I am sure I could pick random animals to set in place of a zodiac, but if I was trying to make an astrology system for a world I was inventing, I would think these would need to form organically form the cultures I was writing about.
Well, it's kind of tough to say that it's only coincidence that there's overlap between the western and Chinese zodiac. I guess the real question would be what's the objective thing these systems are meant to categorize. Like, the stars and time and junk.This difference is kind of interesting to me. For me, I didn't think of the Zodiac as a product of a single culture, but as a real magic that exists regardless of culture.
Actually, astrological signs are defined by solstice and equinox points, not constellations. That isn't an error, that isn't obsolete, that's what it's supposed to be.In the western and near eastern Zodiac the 12 signs correspond roughly to the 12 months (but they are off because the 4 major divisions of the year by the equinoxes and solstices are roughly on the 22nd of March, June, September, and December but that's because stupid people with big egos establish things and nobody changes them even though they are stupid, but I digress. Also there are 4 each cardinal (assertive), fixed (resolute), and mutable (adaptable) signs, and 3 each signs for each element earth, air, fire, and water. To my knowledge these relationships are not explicitly stated in the Chinese zodiac, but there is significant symbolic overlap between the two sets of signs, for example Aries and Dragon, etc. And there is also seen to be a relationship between every 4th sign, for example Aries, Monkey, and Rat have compatible energies in relationships, and these correspond to the three fire signs in the western zodiac.
To complicate matters, though, there already is a dragon's head and a dragon's tail in astrology. Those are the eclipse points: where the sun and moon cross the ecliptic at the same time, which happens at two new moons and two full moons per year, roughly six months apart. When one of them is on the dragon's head (eclipse point) and the other is on the dragon's tail (other eclipse point) at a full moon, there's a lunar eclipse. When they both cross one of the eclipse points at a new moon, there's a solar eclipse. Those points are the reason why we don't have eclipses every single full and new moon.I would go the other way in that there is only 1 zodiacal animal. There is the World Dragon constellation, which spans the whole ecliptic as a dragon chasing its own tail. The important moments of the year are marked by body parts of dragon. The new year begins when the sun moves from tail to head, spring begins when the sun passes the dragon's wings, harvest season is when the sun passes the hind legs of the dragon. That sort of thing.