Trajectory Plane of The Moon
The trajectory of the Moon in revolving the Earth forms plane that is not in the same plane with ecliptic. The ecliptic in this case is : the path of Earth in revolving the Sun.
When the moon orbits the Earth, its trajectory has shape of ellipse. Therefore, the trajectory of the Moon sometime lies in a farthest point form the position of Earth, and sometime it lies in the nearest point.
The trajectory of moon revolving the Earth that farthest is called apogea, while the trajectory of the moon in revolving the Earth that nearest is called perigea.