  Exact coherent states in the Calogero-Sutherland models (of time-dependent
parameters) which describe identical harmonic oscillators interacting through
inverse-square potentials are constructed, in terms of the classical solutions
of a harmonic oscillator. For quasi-periodic coherent states of the
time-periodic systems, geometric phases are evaluated. For the $A_{N-1}$
Calogero-Sutherland model, the phase is calculated for a general coherent
state. The phases for other models are also considered.
