Abstract
With the development of space-geodesy and the application of GPS and SLR in geodesy, the studies on geocenter variation become more important. In the paper, we discuss the geocenter variation in three aspects: definition, theory and observation. Comparing the calculated geocenter variation with the observable result from SLR, we conclude that the geocenter variation has obvious annual and diurnal period with the amplitudes of 2–6mm, which should be corrected in high-precision geodesy.
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