  We present an empirical correction of sky coordinates of X-ray photons
obtained with the XIS aboard the Suzaku satellite to improve the source
position accuracy and restore the point-spread function (PSF). The XIS images
are known to have an uncertainty in position of up to 1 arcmin, and to show
considerable degradations of the PSF. These problems are caused by a drifting
of the satellite attitude due to thermal distortion of the side panel 7, where
the attitude control system is mounted. We found that the position error
averaged over a pointing observation can be largely reduced by using the
relation between the deviation of the source position in the DETX direction and
the ecliptic latitude of the pointing target. We parameterized the wobbling of
the source position synchronized with the satellite orbital period with
temperatures of onboard radiators and elapsed time since the night-day
transition of the spacecraft. We developed software, aeattcor, to correct the
image drift using these parameters, and applied it to 27 point-source images.
We show that the radius of the 90% error circle of the source position was
reduced to 19 arcsec and the PSF was sharpened. These improvements have
enhanced the scientific capability of the Suzaku XIS.
