The reconstruction of the arrival direction of extensive air showers (EAS) is an important part of the data analysis methodology in the SPHERE experiment. Knowledge is necessary to construct an optimal criterion for nuclei separation, used to determine the mass composition of primary cosmic rays (PCR). This work presents a step-by-step development of the algorithm to determine the arrival direction of air showers for the SPHERE-2 and SPHERE-3 telescopes, based on parabolic approximation of the front. It is being developed and tested on the basis of artificial EAS events. The algorithm was applied to experimental events registered in 2012 and 2013 by the SPHERE-2 telescope.
$^1$1. Lomonosov Moscow State University, Faculty of Physics\
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