  A new technique has been devised for the analysis of extensive air shower
data in observing the effect of the moon on this data. In this technique the
number of EAS events with arrival directions falling in error circles centered
about the moving moon is compared to the mean number of events falling in error
circles with centers randomly chosen in the sky. For any assumed angular radius
of the error circle the deficit in EAS event count in the direction of moon
i.e., Nsky-Nmoon which is a moon-related effect is interpreted as the shadow of
the moon. A simple theoretical model has been developed to relate Nsky to the
angular radius of the error circle and has been applied to the counts from the
moon's direction in order to extract the physical parameters of the shadow of
the moon. The technique and the theoretical model has been used on 1.7 *10^5
EAS events recorded at Alborz observatory.
