A new NMR experiment which allows a measurement of the chemical shift anisotropy (CSA) tensor under magic angle spinning (MAS) is described. This correlates a fast MAS spectrum in the omega (2) dimension with a sideband pattern in omega (1) in which the intensities mimic those for a sample spinning at a fraction of the rate omega (r)/N. This method is particularly useful for accurately measuring narrow shift anisotropies. Since the sidebands intensities in omega (1) are identical to those expected at omega (r)/N, standard methods can be used to extract the principal tensor components. The nature of the experiment is such that a minimal number of t(1) increments is required.