pole describes during a complete cycle of the precession. The Earth wobbles in space like an out-of-balance top. Each full wobble takes about 25,765 years. ... Another effect of the Earth's precession is that the star nearest the north celestial pole changes over time.

What effect does precession have on the Polestar?

The 26,000-year precession cycle causes the north celestial pole to move counterclockwise relative to the backdrop stars. Whichever star is closest to the north celestial pole is the pole star.

What effect does precession have on observation of stars?

The effects over the course of a precession cycle on observing is that the celestial poles move and all stars therefore shift ever so slightly from one year to the next.