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that its anomalistic period will be different from that of its sidereal period in the same way that the Moon's anomalistic period differs from its sidereal period. Similarly, planets can be said to have "nodal" periods. When any of these are multiples of the synodic periods, cyclic similarity in sky movement patterns can be expected.

This concludes our discussion of the basic movements of the sky and of the Sun, Moon, and planets. We now move to the problems associated with the observation of these objects and touch on such topics as the discernment and measurement of their positions, motions, and brightnesses.

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