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by rules supported by a divine providence,
                                         and that the heavenly bodies do not move
                                         by chance, nor by their own will, but by
                                         the determinate will and appointment of
                                         the gods. They recorded these movements,
                                         but mainly in the hope of tracing the will
                                         of the gods in mundane affairs. Ptolemy
                                         (about 130 A.D.) made use of Babylonian
                                         eclipses in the eighth century B.C. for im-
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