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Arabian Lefends al Battani

Between the years A.D. 877 and 929 there flourished the famous calculator and astronomer, Muhammad bin Jaber al Battani, Latinized as Albategnius. He was the author of the astronomical work entitled 'The SabŠan Tables,' and adopted nearly the system and the hypothesis of Ptolemy, but rectified them in several points, and made other discoveries, which procured him a distinguished place among the scholars whose labours have enriched astronomical science.

Al-Battani approached much nearer to the truth than the ancients as far as the movements of the fixed stars are concerned. He measured the greatness of the eccentricity of the solar orbit, and a more correct result cannot be obtained. To the work containing all his discoveries he gave the name of 'As-Zij-as Sabi,' which was translated into Latin under the title 'De ScientiÔ Stellarum.' The first edition of it appeared at Nuremberg in A.D. 1537, but it is believed that the original work is in the library of the Vatican. He was classed by Lalande among the forty-two most celebrated astronomers of the world. He died A.D. 929-930.