If we can assume the axis of rotation or crust of the earth are in motion for some reason, this could cause an apparent change in the length of the year.
(this; could cause; an apparent change in the length of the year) (we; can assume; the axis of rotation or crust of the earth are in motion for some reason) Context(we can assume,List([3, 16))):(the axis of rotation or crust of the earth; are; in motion; for some reason)
we can assume,List([3, 16))
this we the axis of rotation or crust of the earth
could cause can assume are
an apparent change in the length of the year
the axis of rotation or crust of the earth are in motion for some reason
in motion for some reason