That Polaris will not always be the pole star is due to:
A)the sidereal day being shorter than the solar day.
B)precession shifting the celestial pole.
C)the Moon following the ecliptic, instead of the equator.
D)the Earth's revolution being slightly less than exactly 365.25 days.
E)the Solar winds blowing the Earth farther away from the Sun.

Question

Quizplus · Accepted Answer

Precession is the slow, cyclical wobbling of the Earth's axis that causes the position of the celestial poles to shift over time. Because of this motion, the star that aligns most closely with the North Celestial Pole changes over the course of thousands of years. Currently, Polaris is the closest star to the North Celestial Pole and therefore serves as the North Star. However, due to precession, Vega will become the North Star in about 14,000 years. Polaris is currently the star closest to the North Celestial Pole, which is the point in the sky around which the stars appear to rotate due to the Earth's rotation. However, this will not always be the case due to a slow motion called precession, which causes the orientation of the Earth's rotation axis to change over a period of about 26,000 years. As a result, different stars will become the pole star at different times in history.

That Polaris Will Not Always Be the Pole Star Is