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| Figure 17.12 Upper: Spectrum of equilibrium tides with frequencies near twice per day. The spectrum is split into groups separated by a cycle per month (0.55deg/hr). Lower: Expanded spectrum of the S2 group, showing splitting at a cycle per year (0.04deg/hr). The finest splitting in this figure is at a cycle per 8.847 years (0.0046deg/hr). From Richard Eanes, Center for Space Research, University of Texas. |