Which motion causes the equinoxes to slowly drift westward along the ecliptic over a period of about 26,000 years?
Answer
Axial precession (precession of the equinoxes)
The slow wobble of the Earth's axis, known as axial precession, causes the intersection points (the equinoxes) to drift along the ecliptic, an effect termed the precession of the equinoxes.
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