the orbit of the moon
ellips
Just as the earth's orbit around the sun, the moon to follows an elliptical orbit around the earth. The earth is placed in one of the two foci. So the distance between earth and moon is not constant. Drag the moon on its orbit and see how distance changes.
The point with the greatest distance to the earth is the apogeon (distance about 405 490 km). The nearest point is the perigeon (about 363 350 km).