This explains everything: Zodiac signs combine colors with feelings and shapes. Fate is determined by their numbers:

Every skeptical mind in disbelief must look at the connections between the seasons and the strength of the organism that was born in a given month. A new body is born after 9 months of pregnancy, and time is a decisive element. Others are born in winter and others in summer. Of course, this is about the annual cycle, the changes that the sun and the moon give us are obvious. Further astral bodies are also important, or as astrology wants, their mutual systems, vortices and affinities. We call them constellations, Rene de Cartes neighborhoods and vortices, physicists gravitational funnels, and the ancients a zodiac. The hemisphere divided into 13 areas gives animals to 12 constellations and an empty area. Some point to Earth as a point here. Usually it consists of 12 constellations, which already from the Chaldeans or maybe even Sumerians act as an interpretation of human fate, based on the systems of their distant and closer stars (planets), recipes were created for the future. Prophecies and horoscopes brought to geometrical perfection during Cagliostr's times allowed to draw a horoscope for a given person using a compass based on their date of birth. Added to this are the numbers whose connections numerology says. Knowledge about the constant habits and attributes that were matched to a given zodiac sign is very extensive and begins with lucky amulets, precious stones, colors, shapes, character traits, pros and cons, and items raising their rank or disturbing a given zodiac sign.