What phenomenon causes the point where the Sun crosses the celestial equator during the vernal equinox to shift westward over millennia?
Answer
Precession
Precession is the slow wobble of the Earth’s axis, which results in the equinoxes gradually shifting their position westward along the Ecliptic over a cycle of approximately 26,000 years.
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The Ecliptic: Crash Course Kids #37.2 - YouTube
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