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Hello.
from what I understand nutation and polar motion are 2 different motions. Nutation is the earths axis tilt changes for about 2° because of the moons gravity force, so it can change from 22°to 24°. and polar motion is when the degree of axis tilt is fixed. But the 2 points it passes the earth changes. For instance the tilt would be 23°. But instead of north pole and south pole,the axis passes through supposedly CA and somewhere south AU. in nutation the axis of rotation actually changes but in polar motion the axis of rotation is fixed, but the earth changes and drifts down. I see articles saying " Warming oceans could cause Earth’s axis to tilt ". But I dont get it. Earths axis is not tilting, its still at mean degree of 23 but its just wobbling. is it correct or where am I wrong? And will mass distribution ever affect earths nutation? Or is it only dependent on moons gravity? Is there a formula to calculate nutation of earth?
Thanks in advance.
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