Here's what you need to know:
* The Moon's orbit is not perfectly circular, it's slightly elliptical. This means the Moon's distance from Earth varies throughout its orbit.
* The focal point of the Moon's elliptical orbit is not a single point, but two points. One of these focal points is located at the center of the Earth. The other focal point is located within the Earth, but not at its exact center.
* The Earth is not stationary at the center of the Moon's orbit. Both Earth and the Moon orbit around their common center of mass.
So, while the Earth is one of the focal points of the Moon's orbit, it's not the only one.
