Resumen
The combination of a model to compute systematic trends in a sample of data, plus the classic Herschel's Method, has produced good results in finding systematic components in the stellar proper motions of Hipparcos Catalogue. First, we measure the Solar Motion, and finally, we found the existence of two motions contained in the Galactic plane with a radial direction towards and away from the Galactic center. Each one of these motions is shared by relatively large sample of stars. The ESA Bulletin (spanish version) issued on October 26 2004 talks about the possible existence of this kind of motions in the solar neighbourhood and makes a reference to an oncoming A&A publication about this subject.
