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Earth's axis slowly swings around a circle, a motion astronomers call:

APenumbration
BPrecession
CPerihelion
DPerturbation
Answer & Solution
Correct answer: B. Precession
1. The direction the axis points is not fixed forever. 2. It changes slowly but regularly. 3. That motion is precession. _Source: OpenStax Astronomy 2e, Chapter 2, Observing the Sky: The Birth of Astronomy._
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