Why do astrologers use the “wrong” sign? I realize this may be the wrong site for this question... I apologize if you consider it inappropriate but hope this community knows the answer.
We just experienced the spectacular conjunction of Jupiter and Saturn (yay!). When I look at the sky, I see these two planets on the edge of Capricorn, almost in Sagittarius. Yet astrologers claim the conjunction is “in Aquarius”.

What is different about their (astrology’s) coordinate system? Any (historical) perspective would be appreciated!
PS I have no interest in astrology as a tool for predicting the future - just trying to understand where this discrepancy comes from.
Precession of the equinox, caused by the cyclical change in the direction of the Earth's tilt, causes the position of the vernal equinox (the point where the path of the sun crosses the celestial equator) to move over time.  When the constellations were first described, the vernal equinox was in Aries, and so it is still called &quot;The First Point of Aries&quot;.  Now it is in Pisces and moving towards Aquarius. Astrologers use &quot;signs&quot; named according to the position of the vernal equinox when the constellations were first described.  So if a planet is at the vernal equinox (and therefore in Pisces, close to Aquarius) an Astrologer in the Western tradition will say that planet is &quot;in Aries&quot;.
So for an astrologer, &quot;Aries&quot; is not a pattern of stars in the sky nor the region of the sky surrounding those stars, but the strip in the sky between 0 and 30 degrees of longitude, even though that region no longer contains the stars of the constellation Aries.