Precession of the Earth's axis causes the date at which perihelion of the Earth's orbit occurs to slowly change.

Question

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Precession of the Earth's axis causes a shift in the orientation of the Earth's axis over time, which alters the point on the celestial sphere where the axis intersects the ecliptic. This, in turn, causes the date at which perihelion (the point in the Earth's orbit where the planet is closest to the sun) occurs to slowly change.

Precession of the Earth's Axis Causes the Date at Which