The figures on the previous pages show the variations of the effective orbital inclinations of the four satellites in the course of the years. Take notice of the different scales, vertically as well as horizontally. For satellite I the curve is given for two centuries, but it is given for 23 centuries in the case of satellite IV.
See how different the four curves are. In each case a well-defined period is readily apparent. This period results from the interference between the periods of the two largest periodic terms — in the case of satellite III, the first two terms of expression (2). The length of this period is given in the last column of Table 37. A.
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