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Nur ad-Din al-Betrugi
Nur ad-Din al-Betrugi (also spelled '''Nur al-Din Ibn Ishaq Al-Bitruji''' and '''Abu Ishâk ibn al-Bitrogi'''; another spelling is '''al Bidrudschi''') (known in the West by the Latinized name of '''Alpetragius''') (died ca. 1204 AD) was an Arab Islamic astronomy|astronomer and Early Islamic philosophy|philosopher of the Islamic Golden Age (Middle Ages). Born in Morocco, he settled in Seville, in Andalusia. He became a disciple of Ibn Tufail (Abubacer) and was a contemporary of Averroës.
The crater Alpetragius (crater)|Alpetragius on the Moon is named after him.
Works
Al Betrugi wrote the ''Kitab-al-Hay’ah'' (Arabic,'''كتاب الحياة'''), translated from the Arabic language|Arabic into Hebrew language|Hebrew, and then into Latin by Michael Scot as ''De motibus celorum'' (first printed in Vienna in 1531).
He advanced a theory on planetary motion in which he wished to avoid both Deferent and epicycle|epicycles and eccentrics,[Bernard R. Goldstein (March 1972). "Theory and Observation in Medieval Astronomy", ''Isis'' '''63''' (1), p. 39-47 41.] and to account for the phenomena peculiar to the wandering stars, by compounding rotations of homocentric spheres. This was a modification of the system of planetary motion proposed by his predecessors, Ibn Bajjah (Avempace) and Ibn Tufail (Abubacer). He was unsuccessful in replacing Ptolemy's planetary model, as the numerical predictions of the planetary positions in his configuration were less accurate than those of the Ptolemaic model,[Ptolemaic Astronomy, Islamic Planetary Theory, and Copernicus's Debt to the Maragha School, ''Science and Its Times'', Thomson Gale.] because of the difficulty of mapping Ptolemy's epicyclic model onto Aristotle's concentric spheres.
See also
- List of Arab scientists and scholars
References
External links
- A. Zahoor, "Alpetragius"
Category:12th-century births
Category:1204 deaths
Category:Moroccan writers
Category:Moroccan scholars
Category:Moroccan philosophers
Category:Islamic astronomy
Category:Arab philosophers
Category:Arab astronomers
Category:12th-century philosophers
Category:Spanish philosophers
Category:Muslim philosophers
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