  We have performed an analysis and interpretation of the X-ray light curve of
the accreting neutron star Her X-1 obtained with the ASM RXTE over the period
1996 February to 2004 September. The averaged X-ray light curves are
constructed by means of adding up light curves corresponding to different 35
day cycles. A numerical model is introduced to explain the properties of the
averaged light curves. We argue that a change of the tilt of the accretion disk
over the 35 day period is necessary to account for the observed features and
show that our numerical model can explain such a behavior of the disk and
reproduce the details of the light curve.
