Here's why:
* Astrology doesn't rely on the physical positions of planets to determine zodiac signs. Zodiac signs are defined by the position of the Sun in the sky at the time of a person's birth.
* The Earth's axis does wobble slightly over very long periods (thousands of years), which is known as precession. This does cause the apparent position of stars to shift slightly over time. However, this shift doesn't change the dates associated with zodiac signs. It only affects the precise background constellation against which the Sun is located at a specific time.
* Modern Western astrology relies on the tropical zodiac, which is based on the equinoxes and solstices. This system doesn't take into account the precession of the Earth's axis and focuses on the Sun's position relative to these points.
In summary:
* The zodiac signs themselves are not changing.
* Precession does shift the background constellations, but this has no practical effect on the dates associated with each zodiac sign in the modern tropical system.
The idea of zodiac signs changing due to planetary movement is a misconception. Astrology is a complex system with many interpretations, but it's crucial to understand the difference between the actual astronomical events and how they are used in astrological frameworks.