What phenomenon causes the Sun's current astronomical location to differ from the constellation corresponding to its traditional astrological sign?
Answer
The precession of the equinoxes.
Precession of the equinoxes is a slow wobble of the Earth's rotational axis, causing the celestial equator and equinox positions to shift relative to the stars over millennia.
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The Ecliptic: Crash Course Kids #37.2 - YouTube
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