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. Vectors are precessed between the systems of the mean equators at "epoch" ta and "date" t, respectively by xQ m ( i ) = M(t0, i)xQm(to). One of the arguments of Μ is the angle / between the mean equators of epoch and date, respectivley. Andoyer (1911) and recent authors approximate J by of third-order polynomials in time. For long periods, however, this is inadequate because /varies nonlinearly with time. In this paper, I represent /in the form of a product of an analytical approximation /*, which remains accurate for much larger t ta.

On the Calculation of the Angle J Between the Mean Equators at Two Different Epochs