Schematic of the frequency changes. A Doppler shift is used to move from the frame comoving with the emitting surface (left) to the LNRF at the radius of the surface (middle), taking into account the emission source rotation. Then we move to the receiving particle frame (right), accounting for two more changes in frequency, the gravitational time dilation due to the change of radial distance from the source to the target and the different effects of frame dragging, again because of the change in radial distance.