  We study the possibility of determining the octant of the neutrino mixing
angle $\theta_{23}$, that is, whether $\theta_{23}> 45^\circ$ or
$\theta_{23}<45^\circ$, in long baseline neutrino experiments. Here we
numerically derived the sensitivity limits within which these experiments can
determine, by measuring the probability of the $\nu_{\mu}\to \nu_{e}$
transitions, the octant of $\theta_{23}$ with a $5\sigma$ certainty. The
interference of the CP violation angle $\delta$ with these limits, as well as
the effects of the baseline length and the run-time ratio of neutrino and
antineutrino modes of the beam have been analyzed.
