The Precession of the Equinoxes

Our planet is tilted with respect to the ecliptic plane, right? The plane of the solar system. And there's a north pole and a south pole, which is so you can see what that is. So this entire cycle, one entire cycle, from polaris to vega and back, that takes about 26 thousand years ago,. It's actually about 25 thousands 700 or so years. That is called the precession of the equinoxes. There are geological evidences that some extreme happens every 26 thousonears.