Happy Birthday Sagittarius. You are ruled by Jupiter, the planet of solutions, opportunities and growth. The cycles of Jupiter are more important to you than any other sign of the zodiac. Right now, you have one staring you in the face (until Christmas 2015) which would allow you to open up your career, your life at university or your unpaid work. The phrase for this time in your life is simple. From little acorns, big oak trees grow. Once you find the acorn, plant it.