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ALBATEGNIUS (c. 850-929)

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Originally appearing in Volume V01, Page 491 of the 1911 Encyclopedia Britannica.
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ALBATEGNIUS (c. 850-929)  , an Arab See also:prince and astronomer, correctly designated Mahommed See also:ben Gebir al Batani, his surname being derived from his native See also:town, Batan in See also:Mesopotamia . From his observations at Aracte and See also:Damascus, where he died, he was able to correct some of See also:Ptolemy's results, previously taken on See also:trust . He compiled new tables of the See also:sun and See also:moon, See also:long accepted as authoritative, discovered the See also:movement of the sun's apogee, and assigned to See also:annual precession the improved value of 550 . Perhaps independently of Aryabhatta (See also:born at Pataliputra on the See also:Ganges 476 A.D.), he introduced the use of sines in calculation, and partially that of tangents . His See also:principal See also:work, De Motu Stellarum, was published at See also:Nuremberg in 1537 by See also:Melanchthon, in a blundering Latin See also:translation by See also:Plato Tiburtinus (fl . 1116), annotated by See also:Regiomontanus . A reprint appeared at See also:Bologna in 1645 . The See also:original MS. is preserved at the Vatican; and the See also:Escorial library possesses in MS. a See also:treatise of some value by him on astronomicalchronology . See also:Albategnius takes the highest See also:rank among Arab astronomers . See Houzeau, Bibliographic astronomique, i . 467; M . See also:Marie, Histoire See also:des sciences, ii .

113; R . See also:

Wolf, Geschichte der Astronomie; p . 67; See also:Delambre, Hist. de l'astr. au moyen See also:age, ch. ii.; Phil . Trans., 1693 (913), where E . See also:Halley supplies corrections to some of the observations recorded in De Motu Stellarum .

End of Article: ALBATEGNIUS (c. 850-929)
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