  ANTARES is the largest undersea neutrino telescope and it has been taking
data in its final configuration for more than ten years. On their journey to
the Earth, cosmic rays can be absorbed by celestial objects, like the Sun,
leading to a deficit in the atmospheric muon flux measured by the ANTARES
detector, the so-called Sun "shadow" effect. This phenomenon can be used to
evaluate fundamental telescope characteristics: the detector angular resolution
and pointing accuracy. This work describes the study of the Sun "shadow" effect
using the ANTARES data collected between 2008 and 2017. The statistical
significance of the Sun shadow observation is $3.7\sigma$ and the estimated
angular resolution value of the ANTARES telescope for downward-going muons is
$0.59^{\circ} \pm 0.10^{\circ}$, which is consistent with the expectations
obtained from the Monte Carlo simulations and also with the estimation from the
Moon "shadow" analysis of 2007-2016 years. No evidence of systematic pointing
shift is found and the resulting pointing accuracy is consistent with the
expectations.
