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The measurement of the flux of beryllium neutrinos with the accuracy of about10% and CNO neutrinos with the accuracy 30% will enable to find the flux ofpp-neutrinos in the source with the accuracy better than 1% using theluminosity constraint. The future experiments on \nu e- scattering will enableto measure with very good accuracy the flux of beryllium and pp-neutrinos onthe Earth. The ratio of the flux of pp-neutrinos on the Earth and in the sourcewill enable to find with very good accuracy a mixing angle theta solar. Lithiumdetector has high sensitivity to CNO neutrinos and can find the contribution ofCNO cycle to the energy generated in the Sun. This will be a stringent test ofthe theory of stellar evolution and combined with other experiments willprovide a precise determination of the flux of pp-neutrinos in the source and amixing angle theta solar. The work on the development of the technology oflithium experiment is now in progress.Comment: Minor corrections, one reference added, 11 pages, 2 figures, talk  given at NANP 2003, Dubna, Russia, June 200

Lithium experiment on solar neutrinos to weight the CNO cycle