ESS11
Prof. Jin-Yi Yu
Precession of Axis
q
There are two kinds of
precession: (1) the
precession of the spin
axis and (2) the
precession of the ellipse.
q
Earth’s wobbling motion
is called the axial
precession.
It is caused
by the gravitational pull
of the Sun and Moon.
(from
Earth’s Climate: Past and Future
)