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Although the Zodiac is best known for astrology nonsense, it has a purpose in astronomy too. The constellations of the Zodiac define the plane of the ecliptic: the region where the Sun, Moon and planets appear to travel through the sky. What are the constellations of the Zodiac, and how do astronomers use them as way points? Read more: http://www.universetoday.com/105854/astronomy-cast-319-the-zodiac/#ixzz2j36wgMCY