The article explains that there are different branches of astrology. A popular Eastern form of astrology looks to the background stars as its guide. Whereas Western astrology uses the zodiac and is fixed to the seasons. The Zodiac signs are guided by star signs, and the zodiac is based on our relationship to the sun, not the stars.
Claudine states that
"Most Westerners, and all those horoscope pages we eagerly check, go by the zodiac. These signs follow what early astrologers called star signs, whose reference points are the tropics that form a ring around the earth. The zodiac is based on our relationship to the sun, not the stars."
So here's the issue: Around 2,000 years ago the astrological signs and the astronomical ones were the same, but they're not anymore. The locations of the signs are based on the sun's location on the first day of spring. Over a period of thousands of years, that location has slowly drifted westward. Thus, if you follow astrology that is linked to the constellations, like the main Eastern astrology called Sidereal, then your sign may have changed. You could have even been given the new sign called, Ophiuchus (ewe).
If you follow Western Astrology, don't fret. Bing Quock, the assistant director of Morrison Planetarium at the California Academy of Sciences, points out that with regards to Western Astrology,
"astrologers are not talking about the constellations at all. When an astrologer says the sun is in a certain sign, they're talking about the sign, the location relative to the equinox. They're not talking about the location of the constellations."
Thank goodness! I can't imagine being anything except a Libra.
Shine: Has Your Horoscope Changes?
No, Your Zodiac Sign Hasn't Changed