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  1. Configuring the universe: Aporetic, problem solving, and kinematic modeling as themes of Arabic astronomy.Abdelhamid I. Sabra - 1998 - Perspectives on Science 6 (3):288-330.
    The undoubted truth is that there exist for the planetary motions true and constant configurations from which no impossibilities or contradictions follow; they are not the same as the configurations asserted by Ptolemy; and Ptolemy neither grasped them nor did his understanding get to imagine what they truly are.
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