How do the signs of the zodiac relate to astronomy?

           In astronomy, a belt around the heavens extending nine grades on either side od the eliptic, the plane of the earth's orbit and of the sun's apparent annual path. The orbits of the moon and of the principal planets also lie entirely within the zodiac. The twelve atrological signs of the zodiac are each considerd to occupy 1/12 (or 30°) of it's great circle, These signs no longer correspond to the astronomical constellations in which the sun actually appears. The constellations are irregular in size and chape, and the sun regulary passes through one constellation (Ophiuchus) that is not considered a member of the zodiac.

          In astrology and the horoscope, each Zodiac sign represents a character, a tendency, which affects any celestial body therein. The planets express what happens, the Houses where it happens, the aspects why, and the Zodiac signs how.

          Every  planet moves through the Zodiac, and changes character according to what sing it is in. The planets are the acting forces in the horoscope, but the zodiac signs nuance and alter their character

History

          The history of zodiac signs, it is strongly believe that the science of astrology and 12 zodiac signs are at least 3,000 years old.

         Where these zodiac signs were originated? Well, it is also believed that the science 12 zodiac signs were originated in ancient Egypt and Babylonia, but when it comes to the advanced study of zodiac signs two countries seem to hold a dominating position i.e. India and China. Chinese astrology is also world famous and it uses animals (a 12 year cycle, each named after an animal) for the names of the years. That's because in these countries many astrologers and soothsayers known to use different animal and human signs to predict the future and destiny of people.

         As far as documentary proofs are concerned, zodiac signs were known to be in use by Roman era inherited by Hellenistic astronomy from Babylonian astronomy from the Chaldean period. Evidently, earlier fortunes and destinies of highly influensive people such as kings and merchants were told by priests and astrologers so that these influensive people could take all necessary steps to safeguard their own interests and the interests of their people.


¿what are the constellations?
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Some carecteristics of zodica signs