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The paper is devoted to the analysis of the systematic deviations between theclassical formula for the rate of secular apsidal motion in close binaries andthe formula established within the framework of the theory of dynamic tides.The basic behaviour is found to be governed by the dependency of the forcingfrequencies on the orbital period and the rotational angular velocity,irrespective of the stellar model. For binaries with short orbital periods agood agreement between the classical apsidal-motion formula and the formulaestablished within the framework of the theory of dynamic tides is onlypossible for certain values of the rotational angular velocity.Comment: accepted for publication in A&A, 5 page

The effect of stellar compressibility and non-resonant dynamic tides on the apsidal-motion rate in close binaries