How do the signs of the zodiac relate to astronomy?
Though many people start their days by checking their horoscope in the newspaper, the 12 constellations of the zodiac are no more important to astronomers than the other 76 constellations.
The significance of the zodiac stems from the fact that the ecliptic -- the narrow path on the sky that the Sun, Moon, and planets appear to follow -- runs directly through these star groupings. Since ancient times, the Sun, Moon, and planets have been known as special astronomical objects -- they "wander" through the background stars of the zodiac, which remain fixed with respect to each other. It was reasoned that these zodiacal constellations must be special to make up this path, and the relative positions of the "wandering stars" within them bore great importance.
True scientific astronomy has its roots in the attempts of ancient astrologers to predict future occurrences of, for instance, imperial Jupiter and the blood-red planet Mars meeting within the charging bull of Taurus -- a potentially powerful omen for those who believed the planets represented the gods themselves.
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