If the Polar Axis of Earth Moves Through a Full

Multiple Choice

If the polar axis of Earth moves through a full circle in 26,000 years as a result of precession (see Figure 1-22a) , how long will it take for the line between the center of the circle and the spin axis to move through 180° (i.e., to the other side of the circle) ?

A) 26,000 years
B) 1 year
C) about 100 years
D) 13,000 years