Earth’s axis slowly but continuously points in different directions in a phenomenon called <u>axial precession</u>.
Explanation:
The tilt of the earth is not constant at 23.5 degrees. Rather the earth's axis precesses in a cycle of approximately 25,772 years. This slow precession can have an apparent effect on climate on earth, especially in conjunction with <em>Milankovitch cycles</em> like aphelion and perihelion. Due to the axial precession, the poles can be facing to or away from the sun during aphelion or perihelion. This consequently can affect the cover ice sheet and glacier in the poles due to the time of exposure to sun rays.
