Each Zodiac Sign in the astrological sky is said to be ruled by a planet. Uranus, Neptune, and Pluto have been recently included in the list of ruling planets. Before the discoveries of these planets, Mars, Jupiter, and Saturn did double duty by ruling 2 signs. On the day you were born a particular planet was powerful in the sky and this is your ruling planet. Your ruling planet serves as your Guardian Angel. You get your habits, characters and traits from this planet. Your ruling planet is in constant motion across the sky and changes your life-course accordingly.