Is the earth’s axis always in the same plane? Does the tilt stay the same? What does this effect?
A line is an 1-D space. Plane is a 2-D space and the Earth is a 3-D
space. Two lines (in same or different directions ) determine a plane
Earth's axis is a
axis. So, relatively, both are coplanar..
Over a period of Great Year (nearly 25800 years), the polar axis
moves ( relative to the Earth ) along the surface of a cone of semi-
to the ecliptic as the same
motion. The average variation (
about 41 K years ) of this angle, about the mean 23.27^o. is nearly 0,
Of course, poles move but its precession and nutation ( nodding
across ) are incognizant.