The system has a telescope to direct a set of light beams i.e. incident beams, corresponding to atmospheric survey points toward an interferometer. The interferometer comprises a field corresponding to the light beams, where the field has center. The survey points correspond to projections (P0-P8) of survey points on the field. An optical device formed of reflecting mirrors brings the projections of the survey points of the field center of the interferometer to respectively correspond to points (P1'-P8').