If that plane passes through the centre of the sphere (so that the centre of the circle is also the centre of the sphere), the circle is called a great circle. The mean radius of the Earth, in the sen...If that plane passes through the centre of the sphere (so that the centre of the circle is also the centre of the sphere), the circle is called a great circle. The mean radius of the Earth, in the sense of the radius of a sphere having the same volume as the actual geoid, is a 3√a2c=6371.00 km.
If it is possible to find a set of axes with respect to which the product moments F, G and H are all zero, these axes are called the principal axes of the body, and the moments of inertia with respect...If it is possible to find a set of axes with respect to which the product moments F, G and H are all zero, these axes are called the principal axes of the body, and the moments of inertia with respect to these axes are the principal moments of inertia.