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Published online by Cambridge University Press: 03 August 2017
The basic observables of VLBI for geophysics are the delay and the delay rate. These two basic observables depend on relative geometric relations between the baseline vector and the source vector. The transformation of baseline orientation from the terrestrial coordinate system, in which the stations are located, to the celestial coordinate system, in which VLBI observables are calculated, involves a number of models. One of them is the rotation model.