Gamma Cephei as a future North Star. Our present North Star, which we know as Polaris, will continue to reign as the northern pole star for centuries to come.
But our present-day
Polaris won’t remain the North Star forever, due to a motion of Earth known as the
precession of the equinoxes. Gamma Cephei stands next in line to inherit the North Star title. This star will be closer to the north celestial pole than Polaris around 3000 CE. It will most closely mark the north celestial pole around 4000 CE.
But – due to precession – Earth’s northern axis will continue to trace its great circle among the northern stars. Around 7500 CD,
Alderamin – Cepheus’ brightest star – will become the North Star. And ultimately, of course, our present-day Polaris will be the North Star once more.