How does the moon orbit vary with time?
Relative to the Earth, the orbit is an ellipse in a plane inclined at
ecliptic every fortnight, nearly. These ascending and descending
nodes nodes are not fixed with respect to the line of centers of the
Earth and the Sun, the Sun-Earth Arm (SEA). The distances from the
Earth, nearest perigee and the farthest apogee, in every revolution.
over a lunar month are also not fixed. These variations over long
periods had been observed..
Relative to the Sun, Moon's motion is due to the rotation of the
Earth-Moon Arm,, around the Earth's orbit, Moon traces 13+, spirals,
in a year, Its path around the Earth's orbit is over a torus that has
the Earth's orbit as its axis.... ..