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EVIDENCE OF PLUMB LINE VARIATIONS IN EUROPE FROM LATITUDE OBSERVATIONS

             

摘要

In response to the resolutions of the IUGG-IAG and IAU in 1991, a study of thepossibility of deriving long-term variations of bldnib line from Optical astrometric latitudedata has been carried out. Evidence of the existence of plumb line variations in Europe,ofwhich the periods are about 4 to 6 years, will be sh0wn in the

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