  The level-crossing probability, local and global adiabaticity conditions are
discussed for 2-flavour neutrino oscillations in matter with arbitrary mixing
angle $\theta$. Different approximations for the survival probability of
supernova neutrinos are compared. Results of a combined likelihood analysis of
the observed SN1987A neutrino signal and of the latest solar neutrino data
including the recent SNO CC measurement are presented.
