Calculate the circumferences of the Earth, Moon, and Sun when their radii are as follows: Earth [[$ 6378 $]] km, Moon [[$ 1738 $]] km, and Sun [[$ 6.96\cdot 10^5 $]] km.

The diameter of the Earth, measured from the equator, is [[$ 43 $]] km longer than if the length of the Earth's axis of rotation is measured from the south to the North Pole. Flattening is caused by a greater central force on the equator. You can feel the effect of the central force when the car is driven on a sufficiently hard winding road.

The diameter of the Earth is km.

The diameter of the Moon is km.

The diameter of the Sun is km.