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helped to a fuller knowledge of the heavenly
motions than was possible without these
records.
So Hipparchus, about 150 B.C., and Ptolemy
a little later, were able to use the observa-
˜
tions of ChaldAan astrologers, as well as
those of Alexandrian astronomers, and to
make some discoveries which have helped
the progress of astronomy in all ages. So,
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