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Precision measurement of the leptonic CP violating phase $\delta$ will sufferfrom the, then surviving, large uncertainty of sin^2 \theta_{23} of 10-20% inthe experimentally interesting region near maximal mixing of \theta_{23}. Weadvocate a new method for determination of both \theta_{23} and $\delta$ at thesame time using only the \nu_e and \bar{\nu}_e appearance channels, and showthat sin^2 \theta_{23} can be determined automatically with much higheraccuracy, approximately a factor of six, than \sin \delta. In this method, weidentify a new degeneracy for the simultaneous determination of \theta_{23} and\delta, the \theta_{23} intrinsic degeneracy, which must be resolved in orderto achieve precision measurement of these two parameters. Spectral informationaround the vacuum oscillation maxima is shown to be the best way to resolvethis degeneracy.

Correlated, Precision Measurements of \theta_{23} and $\delta$ using only the Electron Neutrino Appearance Experiments