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The time variation of the elastic scattering rate of solar neutrinos withelectrons in Super-Kamiokande-I was fit to the variations expected from activetwo-neutrino oscillations. The best fit in the Large Mixing Angle solution hasa mixing angle of tan^2theta=0.55 and a mass squared difference ofDeltam^2=6.3times10^-5eV^2 between the two neutrino mass eigenstates. Thefitted day/night asymmetry of -1.8+-1.6(stat)+1.3-1.2(syst)% has improvedstatistical precision over previous measurements and agrees well with theexpected asymmetry of -2.1%.Comment: 5 pages, 7 figures; submitted to Phys. Rev. D (rapid communication

Precise measurement of the solar neutrino day-night and seasonal variation in Super-Kamiokande-I