Question

sometimes the moon comes closer to the earth and sometimes far.why​

Answer 1

Answer:

at point a, it is far and at b it's close.

the celestial body will never be at center of orbit.

Answer 2

Sometimes the moon comes closer to the earth and sometimes goes far due to the movement of earth's tides.

- Moon exhibits orbital body which isn't denoted as circle but it's an ellipse.

- Due to the action of the tidal forces moon is sliding away slowly and steadily at a steady rate of 3cm per year.

- Further earth transfers it's spinning energy into tidal bulge and as the earth rotates it facilitates the tidal waves far away from the earth.