The center of gravity of a body is the point at which the net torque due to gravity vanishes. If the gravitational field can be considered uniform, the centroid and centroid are the same. However, for satellites in orbit around the planet, if no other torque is applied to the satellite, small changes in the gravitational field (gradient) between near (strong) and far (weak) the planet will cause the torque tends to occur. Align the satellite so that its longitudinal axis is vertical. In such cases, it is important to distinguish between centroid and centroid. A torque is applied due to the horizontal displacement between the two. Note that the centroid is a fixed property of certain rigid bodies (such as slosh or no joints). On the other hand, the center of mass may also depend on orientation in a non-uniform gravity setup. In the latter case, the center of mass is always slightly closer to the main attractor than the center of mass, so changing the orientation of the target will change the position of the target.