"Long story short, according to Minnesota Planetarium Society board member Parke Kunkle the signs of the zodiac have changed because the gravitational force of the Moon has managed to tilt the planet’s axis a bit since the Babylonians determined the dates of the Zodiac five thousand years ago. It is also learned that not only has the way you read horoscope changed, they also claim to have discovered that there may be a 13th Zodiac sign called Ophiuchus. However, Parke Kunkle’s discovery only addresses sidereal zodiac, that is based on constellations. Therefore this change only concerns people in the East. Westerners adhere to tropical zodiac that is fixed to seasons (equinox to equinox). In conclusion, your zodiac sign has not changed."