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 Equinoxes and Tropicks, Thales was the first that could predict an Eclipse in Greece, not DC Years before Christ, and without doubt it was but a rude Account he had of the Motions; and 'twas Hipparchus who made the first Catalogue of the Fix'd-Stars, not above CL Years before Christ, without which Catalogue there could be scarce such a Science as Astronomy, and it is to the Subtilty and Diligence of that great Author, that the World was beholding for all its Astronomy for above MD Years. All that Ptolemee did in his Syntaxis, was no more but a bare Transcription of the Theories of Hipparchus, with some little Emendation of the periodical Motions, after about CCC Years Interval; and this Book of Ptolemee's was without Dispute, the utmost Perfection of the Ancient Astronomy, nor was there any thing in any Nation before it comparable thereto; for which Reason all the other Authors thereof were disregarded and lost; and among them Hipparchus himself. Nor did Posterity dare to alter the Theories delivered by Ptolemee, though successively Albategnius and the Arabs, and after them the Spanish Astronomers under Alphonsus, endeavoured to amend the Er-