Why must we cooperate? Allow me to stress the reasons. We need some recapitulation, connected with this document we must send to the Executive Committees of our unions. First of all I can say, that the atmospheric effects on astrometrie and geodetic observations put a limit on the real accuracy. Therefore, it is a common problem, which I think we must solve together. The second common field is the latitudelongitude and azimuth observations in geodetical astronomy, or earth rotation in astrometry. Therefore, it is the same problem we investi gate. The third question is the determination, or rather the elimination, of refractional influences at a star observation. We have this kind of needs in both geodetical astronomy and astrometry. The fourth common field is the modelling of the atmosphere, not only the whole atmosphere.
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