Have the Astrological Signs Changed?
That will depend on which chart you follow, but in fact, they have not changed at all - at least not recently. In order to understand this, we must go back to the point of two different chart systems, Tropical and Sidereal.
If you live in the Western world, for example North America and Europe, you most likely follow the Tropical chart and your Zodiac sign remains the same. The Tropical chart is calculated using the seasonal Equinoxes and Solstices, not by the stars themselves per say. In fact, even though the zodiac signs are named after constellations, this chart is not based on the position of planets and stars at all, and it tends to be off by an average of 24.5 days.
Sidereal traditions technically hold more accurate calculations and are based on the movement of the planets and stars. This chart added the 13th sign, Ophiuchus, back in 130 BC. Sidereal monitors the Earth’s shifting axis and how the planet’s position has changed and continues to change over time. The astrology chart compensates for this shifting, since astrologers keep a close eye on the actual position of the planets and stars.
So in fact, the zodiac signs have not changed at all, only the awareness of the signs has changed. The Western world is only just now discovering there is another astrology system more closely focused on the planets and stars.