  The International Liquid Mirror Telescope (ILMT) has recently become
operational at the Devasthal Observatory of ARIES, Nainital, India. The ILMT
observes in the Time delay integration (TDI) mode where the images are formed
by electronically stepping the charges over the pixels of the CCD, along a
column. Observations near the zenith impose certain constraints dependent on
the latitude such as image deformation due to the star-trail curvature and
differential speed. These effects make the stellar trajectories in the focal
plane of the ILMT to be hyperbolic, which are corrected for by the introduction
of a TDI optical corrector, designed specifically for the ILMT. Here, we report
the first results on the effect of this corrector on the trajectories followed
by the stars in the ILMT focal plane. Astrometrically calibrating nine nights
of data recorded with the ILMT during its first commissioning phase, we find
simple (nearly linear) relations between the CCD-y coordinate and the right
ascension (RA) of stars and between the CCD-x coordinate and their declination
(DEC), respectively, which confirms that the TDI corrector works very fine in
converting the stellar trajectories into straight lines.
