  The traditional physical description of neutrino flavor conversion in the Sun
focuses on the notion of resonance. However, the resonance picture is valid
only in the limit of small mixing angles theta. For large values of theta, the
resonance picture leads to seemingly paradoxical results. This observation is
important for understanding the physics of neutrino flavor conversion in the
Sun, since the latest solar neutrino data seems to prefer large mixing angles.
Here we review the basic arguments and in particular show that the resonance
does not in general coincide with either the point of maximal violation of
adiabaticity in the nonadiabatic case or the point of maximal flavor conversion
in the adiabatic case. We also discuss a modified adiabaticity criterion.
