  The precession of a test gyroscope along stable bound equatorial plane orbits
around a Kerr black hole is analyzed and the precession angular velocity of the
gyro's parallel transported spin vector and the increment in precession angle
after one orbital period is evaluated. The parallel transported Marck frame
which enters this discussion is shown to have an elegant geometrical
explanation in terms of the electric and magnetic parts of the Killing-Yano
2-form and a Wigner rotation effect.
