How does precession affect the earth's rotation and revolution?
Taken in conjunction with the 26000-year spin-axis precession, the 71000-year orbit precession causes a 41000-year oscillation in the tilt of the earths axis.
This is also observed by the phenomenon termed the Milankovitch cycles.
The most startling consequence of this is that the tropics (the tropics of Cancer and Capricorn, where the most northerly or southerly vertical rays of the sun strike) are MOVING TOWARD THE EQUATOR.
The rate is more than 14 meters per year! Example: the government of Taiwan erected a monument in a park marking the tropic in 1908. The actual tropic is now more than a kilometer south of this location! The arctic circles are likewise travelling toward their respective poles. The temperate zones gain 1550 square kilometers of territory every year!
Another consequence may be seen in climactic data from oxygen isotope data: there a appears to be a cyclic climate pattern with a 41,000-year period, one of the so-called Milankovitch cycles.