The obliquity of the ecliptic is the angle by which the earth's rotation axis is tipped from being perpendicular to the plane of the earth's orbit around the sun;
(The obliquity of the ecliptic; is; the angle by which the earth's rotation axis is tipped from being perpendicular to the plane of the earth's orbit around the sun) (the earth's rotation axis; is tipped; from being perpendicular to the plane of the earth's orbit around the sun)
The obliquity of the ecliptic the earth's rotation axis
is is tipped
the angle by which the earth's rotation axis is tipped from being perpendicular to the plane of the earth's orbit around the sun
from being perpendicular to the plane of the earth's orbit around the sun