The geometrical theory of the variable separation for the Hamilton-Jacobi e
quation is applied to the classical three-body inverse-square Calogero syst
em. It is proved that this system is separable in infinitely many inequival
ent ways, related to five different kinds of separable webs in the Euclidea
n three-space, and the corresponding systems of independent first integrals
in involution are computed. (C) 2000 American Institute of Physics. [S0022
-2488(00)05707-8].