  We investigate known exact solutions of hydrodynamics and derive analytic
formulas for the polarization of baryons produced at freeze-out. Such
polarization (observed in high energy heavy-ion experiments) carries
information on the time evolution of the quark-gluon plasma (sQGP), and our
results give first analytic insight into the connection between this type of
measurements and dynamical properties of the sQGP (e.g. vorticity). We present
results for a rotating and acceleratingly expanding solution and also give
hints on how to calculate the polarization using a rotating extension of the
Buda--Lund parameterization.
