Every time observed the axis of the earht,and also consider as extraordinary these phenomena that we know today are:Cyclones,hurricanes and earhtquakes,then we would have to consider the continuity of planets - large or small - that have had their perihelion with ours and all the organic matter as the alteration of life.so that the importance of the moutations of nutation as:
Presence of organic life as long as they were the proximity of the spheres =
= Perihelion of ( n1+n2 + ..... n ) x
distance from the angle to another of the solar system /
rotation of the sun.