This is the conclusion of the previous section: in a constant magnetic field B 0 along z axis the transverse magnetization M xy rotates around this axis in clockwise direction with angular frequency ω 0. If the observer were rotating around the same axis in clockwise direction with angular frequency Ω, M xy it would appear to her or him rotating with angular frequency ω 0 - Ω. Specifically, if the observer were rotating around the same axis in clockwise direction with angular frequency ω 0, the transverse magnetization M xy would appear to her or him stationary.