How do the sing of the zodiac relate to astronomy?

First of all, we'll define what the zodiac is. The zodiac is a region in the sky limited by two parallel planes to the elliptic. The Sun appears to move along the ecliptic as the earth orbits the Sun each year. The Zodiac are the twelve constellations that lie along the Ecliptic. With latitude +-8. Within this area we find all the important planets but Pluto, which is no longer considered a planet.

Constellations have a close relationship with zodiac signs. Every zodiac sign is linked to a constellation shaped like an animal. (Zodiac actually means “animal circle”, which comes from the greek word “zodiac). According to astrology, there are 12 to 13 constellations, unlike astronomy that only considers 12 of them as real ones.