The question
Why do the constellations no longer match the dates of the signs?
The short answer
Earth’s axis wobbles like a slowing top, completing a circle in about 25,800 years. Over centuries this shifts where the sun sits against the stars on any given date.
What science knows
Established ScienceThe gravity of the sun and moon pulls on Earth’s equatorial bulge, making the axis slowly circle. The equinox points drift west along the zodiac by about 50 arcseconds a year, one degree in about 72 years.
Hipparchus discovered the effect around 130 BCE by comparing his star positions with records made about 150 years earlier.
The pattern
Established ScienceThe full cycle takes about 25,770 years. Traditional astrology often rounds it to 25,920 years, which divides neatly into twelve “ages” of 2,160 years.
What is still uncertain
Mixed EvidenceWhen the “Age of Aquarius” begins has no agreed answer, because constellations have unequal sizes and astrologers choose different boundaries; proposed dates span several centuries.
Why humans find it interesting
Historical FactAround 2800 BCE the pole star was Thuban, in Draco. Polaris is close to the pole today, and Vega will be the bright pole star in about 12,000 years.
CUE perspective
CUE PerspectivePrecession is why CUE is precise about which zodiac it uses: the Western signs by calendar date, not the constellations behind the sun.
The sky moves; a system has to choose its reference. Saying which one is part of reading astrology honestly.